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1. Indirect Measurements of the Composition of Ultrafine Particles in the Arctic Late‐Winter

Author

Myers, Deanna C, Lawler, Michael J, Mauldin, Roy L, Sjostedt, Steven, Dubey, Manvendra, Abbatt, Jonathan, and Smith, James N

Subjects
Climate Action, Life Below Water, OASIS, Utqiagvik, ultrafine aerosol, new particle formation, Atmospheric Sciences, Physical Geography and Environmental Geoscience
Abstract

We present indirect measurements of size-resolved ultrafine particle composition conducted during the Ocean-Atmosphere-Sea Ice-Snowpack (OASIS) Campaign in Utqiagvik, Alaska, during March 2009. This study focuses on measurements of size-resolved particle hygroscopicity and volatility measured over two periods of the campaign. During a period that represents background conditions in this location, particle hygroscopic growth factors (HGF) at 90% relative humidity ranged from 1.45 to 1.51, which combined with volatility measurements suggest a mixture of ∼30% ammoniated sulfates and ∼70% oxidized organics. Two separate regional ultrafine particle growth events were also observed during this campaign. Event 1 coincided with elevated levels of H2SO4 and solar radiation. These particles were highly hygroscopic (HGF = 2.1 for 35 nm particles), but were almost fully volatilized at 160 °C. The air masses associated with both events originated over the Arctic Ocean. Event 1 was influenced by the upper marine boundary layer (200–350 m AGL), while Event 2 spent more time closer to the surface (50–150 m AGL) and over open ocean leads, suggesting marine influence in growth processes. Event 2 particles were slightly less hygroscopic (HGF = 1.94 for 35 nm and 1.67 for 15 nm particles), and similarly volatile. We hypothesize that particles formed during both events contained 60–70% hygroscopic salts by volume, with the balance for Event 1 being sulfates and oxidized organics for Event 2. These observations suggest that primary sea spray may be an important initiator of ultrafine particle formation events in the Arctic late-winter, but a variety of processes may be responsible for condensational growth.

Published
2021

2. Coupled Air Quality and Boundary-Layer Meteorology in Western U.S. Basins during Winter: Design and Rationale for a Comprehensive Study.

Author

Hallar, A Gannet, Brown, Steven S, Crosman, Erik, Barsanti, Kelley, Cappa, Christopher D, Faloona, Ian, Fast, Jerome, Holmes, Heather A, Horel, John, Lin, John, Middlebrook, Ann, Mitchell, Logan, Murphy, Jennifer, Womack, Caroline C, Aneja, Viney, Baasandorj, Munkhbayar, Bahreini, Roya, Banta, Robert, Bray, Casey, Brewer, Alan, Caulton, Dana, de Gouw, Joost, De Wekker, Stephan FJ, Farmer, Delphine K, Gaston, Cassandra J, Hoch, Sebastian, Hopkins, Francesca, Karle, Nakul N, Kelly, James T, Kelly, Kerry, Lareau, Neil, Lu, Keding, Mauldin, Roy L, Mallia, Derek V, Martin, Randal, Mendoza, Daniel, Oldroyd, Holly J, Pichugina, Yelena, Pratt, Kerri A, Saide, Pablo, Silva, Phillip J, Simpson, William, Stephens, Britton B, Stutz, Jochen, and Sullivan, Amy

Subjects
Chemistry, atmospheric, Greenhouse gases, Aircraft observations, Field experiments, Mountain meteorology, Astronomical and Space Sciences, Atmospheric Sciences, Physical Geography and Environmental Geoscience, Meteorology & Atmospheric Sciences
Abstract

Wintertime episodes of high aerosol concentrations occur frequently in urban and agricultural basins and valleys worldwide. These episodes often arise following development of persistent cold-air pools (PCAPs) that limit mixing and modify chemistry. While field campaigns targeting either basin meteorology or wintertime pollution chemistry have been conducted, coupling between interconnected chemical and meteorological processes remains an insufficiently studied research area. Gaps in understanding the coupled chemical-meteorological interactions that drive high pollution events make identification of the most effective air-basin specific emission control strategies challenging. To address this, a September 2019 workshop occurred with the goal of planning a future research campaign to investigate air quality in Western U.S. basins. Approximately 120 people participated, representing 50 institutions and 5 countries. Workshop participants outlined the rationale and design for a comprehensive wintertime study that would couple atmospheric chemistry and boundary-layer and complex-terrain meteorology within western U.S. basins. Participants concluded the study should focus on two regions with contrasting aerosol chemistry: three populated valleys within Utah (Salt Lake, Utah, and Cache Valleys) and the San Joaquin Valley in California. This paper describes the scientific rationale for a campaign that will acquire chemical and meteorological datasets using airborne platforms with extensive range, coupled to surface-based measurements focusing on sampling within the near-surface boundary layer, and transport and mixing processes within this layer, with high vertical resolution at a number of representative sites. No prior wintertime basin-focused campaign has provided the breadth of observations necessary to characterize the meteorological-chemical linkages outlined here, nor to validate complex processes within coupled atmosphere-chemistry models.

Published
2021

3. The gas-phase formation mechanism of iodic acid as an atmospheric aerosol source

Author

Finkenzeller, Henning, Iyer, Siddharth, He, Xu-Cheng, Simon, Mario, Koenig, Theodore K., Lee, Christopher F., Valiev, Rashid, Hofbauer, Victoria, Amorim, Antonio, Baalbaki, Rima, Baccarini, Andrea, Beck, Lisa, Bell, David M., Caudillo, Lucía, Chen, Dexian, Chiu, Randall, Chu, Biwu, Dada, Lubna, Duplissy, Jonathan, Heinritzi, Martin, Kemppainen, Deniz, Kim, Changhyuk, Krechmer, Jordan, Kürten, Andreas, Kvashnin, Alexandr, Lamkaddam, Houssni, Lee, Chuan Ping, Lehtipalo, Katrianne, Li, Zijun, Makhmutov, Vladimir, Manninen, Hanna E., Marie, Guillaume, Marten, Ruby, Mauldin, Roy L., Mentler, Bernhard, Müller, Tatjana, Petäjä, Tuukka, Philippov, Maxim, Ranjithkumar, Ananth, Rörup, Birte, Shen, Jiali, Stolzenburg, Dominik, Tauber, Christian, Tham, Yee Jun, Tomé, António, Vazquez-Pufleau, Miguel, Wagner, Andrea C., Wang, Dongyu S., Wang, Mingyi, Wang, Yonghong, Weber, Stefan K., Nie, Wei, Wu, Yusheng, Xiao, Mao, Ye, Qing, Zauner-Wieczorek, Marcel, Hansel, Armin, Baltensperger, Urs, Brioude, Jérome, Curtius, Joachim, Donahue, Neil M., Haddad, Imad El, Flagan, Richard C., Kulmala, Markku, Kirkby, Jasper, Sipilä, Mikko, Worsnop, Douglas R., Kurten, Theo, Rissanen, Matti, and Volkamer, Rainer

Published
2023
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4. Synergistic HNO3–H2SO4–NH3 upper tropospheric particle formation

Author

Wang, Mingyi, Xiao, Mao, Bertozzi, Barbara, Marie, Guillaume, Rörup, Birte, Schulze, Benjamin, Bardakov, Roman, He, Xu-Cheng, Shen, Jiali, Scholz, Wiebke, Marten, Ruby, Dada, Lubna, Baalbaki, Rima, Lopez, Brandon, Lamkaddam, Houssni, Manninen, Hanna E., Amorim, António, Ataei, Farnoush, Bogert, Pia, Brasseur, Zoé, Caudillo, Lucía, De Menezes, Louis-Philippe, Duplissy, Jonathan, Ekman, Annica M. L., Finkenzeller, Henning, Carracedo, Loïc Gonzalez, Granzin, Manuel, Guida, Roberto, Heinritzi, Martin, Hofbauer, Victoria, Höhler, Kristina, Korhonen, Kimmo, Krechmer, Jordan E., Kürten, Andreas, Lehtipalo, Katrianne, Mahfouz, Naser G. A., Makhmutov, Vladimir, Massabò, Dario, Mathot, Serge, Mauldin, Roy L., Mentler, Bernhard, Müller, Tatjana, Onnela, Antti, Petäjä, Tuukka, Philippov, Maxim, Piedehierro, Ana A., Pozzer, Andrea, Ranjithkumar, Ananth, Schervish, Meredith, Schobesberger, Siegfried, Simon, Mario, Stozhkov, Yuri, Tomé, António, Umo, Nsikanabasi Silas, Vogel, Franziska, Wagner, Robert, Wang, Dongyu S., Weber, Stefan K., Welti, André, Wu, Yusheng, Zauner-Wieczorek, Marcel, Sipilä, Mikko, Winkler, Paul M., Hansel, Armin, Baltensperger, Urs, Kulmala, Markku, Flagan, Richard C., Curtius, Joachim, Riipinen, Ilona, Gordon, Hamish, Lelieveld, Jos, El-Haddad, Imad, Volkamer, Rainer, Worsnop, Douglas R., Christoudias, Theodoros, Kirkby, Jasper, Möhler, Ottmar, and Donahue, Neil M.

Published
2022
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5. Probing isoprene photochemistry at atmospherically relevant nitric oxide levels

Author

Zhang, Xuan, Wang, Siyuan, Apel, Eric C., Schwantes, Rebecca H., Hornbrook, Rebecca S., Hills, Alan J., DeMarsh, Kate E., Moo, Zeyi, Ortega, John, Brune, William H., Mauldin, Roy L., III, Cantrell, Christopher A., Teng, Alexander P., Blake, Donald R., Campos, Teresa, Daube, Bruce, Emmons, Louisa K., Hall, Samuel R., Ullmann, Kirk, Wofsy, Steven C., Wennberg, Paul O., Tyndall, Geoffrey S., and Orlando, John J.

Published
2022
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6. Direct field evidence of autocatalytic iodine release from atmospheric aerosol

Author

Tham, Yee Jun, He, Xu-Cheng, Li, Qinyi, Cuevas, Carlos A., Shen, Jiali, Kalliokoski, Joni, Yan, Chao, Iyer, Siddharth, Lehmusjärvi, Tuuli, Jang, Sehyun, Thakur, Roseline C., Beck, Lisa, Kemppainen, Deniz, Olin, Miska, Sarnela, Nina, Mikkilä, Jyri, Hakala, Jani, Marbouti, Marjan, Yao, Lei, Li, Haiyan, Huang, Wei, Wang, Yonghong, Wimmer, Daniela, Zha, Qiaozhi, Virkanen, Juhani, Spain, T. Gerard, O’Doherty, Simon, Jokinen, Tuija, Bianchi, Federico, Petäjä, Tuukka, Worsnop, Douglas R., Mauldin, Roy L., Ovadnevaite, Jurgita, Ceburnis, Darius, Maier, Norbert M., Kulmala, Markku, O’Dowd, Colin, Dal Maso, Miikka, Saiz-Lopez, Alfonso, and Sipilä, Mikko

Published
2021

7. Sources and characteristics of summertime organic aerosol in the Colorado Front Range: perspective from measurements and WRF-Chem modeling

Author

Bahreini, Roya, Ahmadov, Ravan, McKeen, Stu A, Vu, Kennedy T, Dingle, Justin H, Apel, Eric C, Blake, Donald R, Blake, Nicola, Campos, Teresa L, Cantrell, Chris, Flocke, Frank, Fried, Alan, Gilman, Jessica B, Hills, Alan J, Hornbrook, Rebecca S, Huey, Greg, Kaser, Lisa, Lerner, Brian M, Mauldin, Roy L, Meinardi, Simone, Montzka, Denise D, Richter, Dirk, Schroeder, Jason R, Stell, Meghan, Tanner, David, Walega, James, Weibring, Peter, and Weinheimer, Andrew

Subjects
Meteorology & Atmospheric Sciences, Atmospheric Sciences, Astronomical and Space Sciences
Abstract

Abstract. The evolution of organic aerosols (OAs) and their precursors in the boundary layer (BL) of the Colorado Front Range during the Front Range Air Pollution and Photochemistry Éxperiment (FRAPPÉ, July–August 2014) was analyzed by in situ measurements and chemical transport modeling. Measurements indicated significant production of secondary OA (SOA), with enhancement ratio of OA with respect to carbon monoxide (CO) reaching 0.085±0.003 µg m−3 ppbv−1. At background mixing ratios of CO, up to  ∼  1.8 µg m−3 background OA was observed, suggesting significant non-combustion contribution to OA in the Front Range. The mean concentration of OA in plumes with a high influence of oil and natural gas (O&G) emissions was  ∼  40 % higher than in urban-influenced plumes. Positive matrix factorization (PMF) confirmed a dominant contribution of secondary, oxygenated OA (OOA) in the boundary layer instead of fresh, hydrocarbon-like OA (HOA). Combinations of primary OA (POA) volatility assumptions, aging of semi-volatile species, and different emission estimates from the O&G sector were used in the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) simulation scenarios. The assumption of semi-volatile POA resulted in greater than a factor of 10 lower POA concentrations compared to PMF-resolved HOA. Including top-down modified O&G emissions resulted in substantially better agreements in modeled ethane, toluene, hydroxyl radical, and ozone compared to measurements in the high-O&G-influenced plumes. By including emissions from the O&G sector using the top-down approach, it was estimated that the O&G sector contributed to

Published
2018

8. Rapid growth of new atmospheric particles by nitric acid and ammonia condensation

Author

Wang, Mingyi, Kong, Weimeng, Marten, Ruby, He, Xu-Cheng, Chen, Dexian, Pfeifer, Joschka, Heitto, Arto, Kontkanen, Jenni, Dada, Lubna, Kürten, Andreas, Yli-Juuti, Taina, Manninen, Hanna E., Amanatidis, Stavros, Amorim, António, Baalbaki, Rima, Baccarini, Andrea, Bell, David M., Bertozzi, Barbara, Bräkling, Steffen, Brilke, Sophia, Murillo, Lucía Caudillo, Chiu, Randall, Chu, Biwu, De Menezes, Louis-Philippe, Duplissy, Jonathan, Finkenzeller, Henning, Carracedo, Loic Gonzalez, Granzin, Manuel, Guida, Roberto, Hansel, Armin, Hofbauer, Victoria, Krechmer, Jordan, Lehtipalo, Katrianne, Lamkaddam, Houssni, Lampimäki, Markus, Lee, Chuan Ping, Makhmutov, Vladimir, Marie, Guillaume, Mathot, Serge, Mauldin, Roy L., Mentler, Bernhard, Müller, Tatjana, Onnela, Antti, Partoll, Eva, Petäjä, Tuukka, Philippov, Maxim, Pospisilova, Veronika, Ranjithkumar, Ananth, Rissanen, Matti, Rörup, Birte, Scholz, Wiebke, Shen, Jiali, Simon, Mario, Sipilä, Mikko, Steiner, Gerhard, Stolzenburg, Dominik, Tham, Yee Jun, Tomé, António, Wagner, Andrea C., Wang, Dongyu S., Wang, Yonghong, Weber, Stefan K., Winkler, Paul M., Wlasits, Peter J., Wu, Yusheng, Xiao, Mao, Ye, Qing, Zauner-Wieczorek, Marcel, Zhou, Xueqin, Volkamer, Rainer, Riipinen, Ilona, Dommen, Josef, Curtius, Joachim, Baltensperger, Urs, Kulmala, Markku, Worsnop, Douglas R., Kirkby, Jasper, Seinfeld, John H., El-Haddad, Imad, Flagan, Richard C., and Donahue, Neil M.

Published
2020
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9. An intercomparison study of four different techniques for measuring the chemical composition of nanoparticles

Author

Caudillo, Lucía, primary, Surdu, Mihnea, additional, Lopez, Brandon, additional, Wang, Mingyi, additional, Thoma, Markus, additional, Bräkling, Steffen, additional, Buchholz, Angela, additional, Simon, Mario, additional, Wagner, Andrea C., additional, Müller, Tatjana, additional, Granzin, Manuel, additional, Heinritzi, Martin, additional, Amorim, Antonio, additional, Bell, David M., additional, Brasseur, Zoé, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, He, Xu-Cheng, additional, Lamkaddam, Houssni, additional, Mahfouz, Naser G. A., additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marie, Guillaume, additional, Marten, Ruby, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Onnela, Antti, additional, Petäjä, Tuukka, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Rörup, Birte, additional, Scholz, Wiebke, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Tauber, Christian, additional, Tian, Ping, additional, Tomé, António, additional, Umo, Nsikanabasi Silas, additional, Wang, Dongyu S., additional, Wang, Yonghong, additional, Weber, Stefan K., additional, Welti, André, additional, Zauner-Wieczorek, Marcel, additional, Baltensperger, Urs, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Kirkby, Jasper, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Worsnop, Douglas R., additional, Haddad, Imad El, additional, Donahue, Neil M., additional, Vogel, Alexander L., additional, Kürten, Andreas, additional, and Curtius, Joachim, additional

Published
2023
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10. NO at low concentration can enhance the formation of highly oxygenated biogenic molecules in the atmosphere

Author

Nie, Wei, primary, Yan, Chao, additional, Yang, Liwen, additional, Roldin, Pontus, additional, Liu, Yuliang, additional, Vogel, Alexander L., additional, Molteni, Ugo, additional, Stolzenburg, Dominik, additional, Finkenzeller, Henning, additional, Amorim, Antonio, additional, Bianchi, Federico, additional, Curtius, Joachim, additional, Dada, Lubna, additional, Draper, Danielle C., additional, Duplissy, Jonathan, additional, Hansel, Armin, additional, He, Xu-Cheng, additional, Hofbauer, Victoria, additional, Jokinen, Tuija, additional, Kim, Changhyuk, additional, Lehtipalo, Katrianne, additional, Nichman, Leonid, additional, Mauldin, Roy L., additional, Makhmutov, Vladimir, additional, Mentler, Bernhard, additional, Mizelli-Ojdanic, Andrea, additional, Petäjä, Tuukka, additional, Quéléver, Lauriane L. J., additional, Schallhart, Simon, additional, Simon, Mario, additional, Tauber, Christian, additional, Tomé, António, additional, Volkamer, Rainer, additional, Wagner, Andrea C., additional, Wagner, Robert, additional, Wang, Mingyi, additional, Ye, Penglin, additional, Li, Haiyan, additional, Huang, Wei, additional, Qi, Ximeng, additional, Lou, Sijia, additional, Liu, Tengyu, additional, Chi, Xuguang, additional, Dommen, Josef, additional, Baltensperger, Urs, additional, El Haddad, Imad, additional, Kirkby, Jasper, additional, Worsnop, Douglas, additional, Kulmala, Markku, additional, Donahue, Neil M., additional, Ehn, Mikael, additional, and Ding, Aijun, additional

Published
2023
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11. NO at low concentration can enhance the formation of highly oxygenated biogenic molecules in the atmosphere

Author

Nie, Wei, Yan, Chao, Yang, Liwen, Roldin, Pontus, Liu, Yuliang, Vogel, Alexander L, Molteni, Ugo, Stolzenburg, Dominik, Finkenzeller, Henning, Amorim, Antonio, Bianchi, Federico, Curtius, Joachim, Dada, Lubna, Draper, Danielle C, Duplissy, Jonathan, Hansel, Armin, He, Xu-Cheng, Hofbauer, Victoria, Jokinen, Tuija, Kim, Changhyuk, Lehtipalo, Katrianne, Nichman, Leonid, Mauldin, Roy L, Makhmutov, Vladimir, Mentler, Bernhard, Mizelli-Ojdanic, Andrea, Petäjä, Tuukka, Quéléver, Lauriane L J, Schallhart, Simon, Simon, Mario, Tauber, Christian, Tomé, António, Volkamer, Rainer, Wagner, Andrea C, Wagner, Robert, Wang, Mingyi, Ye, Penglin, Li, Haiyan, Huang, Wei, Qi, Ximeng, Lou, Sijia, Liu, Tengyu, Chi, Xuguang, Dommen, Josef, Baltensperger, Urs, Haddad, Imad El, Kirkby, Jasper, Worsnop, Douglas, Kulmala, Markku, Donahue, Neil M, Ehn, Mikael, and Ding, Aijun

Subjects
Physics in General
Abstract

The interaction between nitrogen monoxide (NO) and organic peroxy radicals (RO$_{2}$) greatly impacts the formation of highly oxygenated organic molecules (HOM), the key precursors of secondary organic aerosols. It has been thought that HOM production can be significantly suppressed by NO even at low concentrations. Here, we perform dedicated experiments focusing on HOM formation from monoterpenes at low NO concentrations (0 – 82 pptv). We demonstrate that such low NO can enhance HOM production by modulating the RO$_{2}$ loss and favoring the formation of alkoxy radicals that can continue to autoxidize through isomerization. These insights suggest that HOM yields from typical boreal forest emissions can vary between 2.5%-6.5%, and HOM formation will not be completely inhibited even at high NO concentrations. Our findings challenge the notion that NO monotonically reduces HOM yields by extending the knowledge of RO$_{2}$-NO interactions to the low-NO regime. This represents a major advance towards an accurate assessment of HOM budgets, especially in low-NO environments, which prevails in the pre-industrial atmosphere, pristine areas, and the upper boundary layer.

Published
2023

12. Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere

Author

He, Xu-Cheng, Simon, Mario, Iyer, Siddharth, Xie, Hong-Bin, Rörup, Birte, Shen, Jiali, Finkenzeller, Henning, Stolzenburg, Dominik, Zhang, Rongjie, Baccarini, Andrea, Tham, Yee Jun, Wang, Mingyi, Amanatidis, Stavros, Piedehierro, Ana A., Amorim, Antonio, Baalbaki, Rima, Brasseur, Zoé, Caudillo, Lucía, Chu, Biwu, Dada, Lubna, Duplissy, Jonathan, El Haddad, Imad, Flagan, Richard C., Granzin, Manuel, Hansel, Armin, Heinritzi, Martin, Hofbauer, Victoria, Jokinen, Tuija, Kemppainen, Deniz, Kong, Weimeng, Krechmer, Jordan, Kürten, Andreas, Lamkaddam, Houssni, Lopez, Brandon, Ma, Fangfang, Mahfouz, Naser G. A., Makhmutov, Vladimir, Manninen, Hanna E., Marie, Guillaume, Marten, Ruby, Massabò, Dario, Mauldin, Roy L., Mentler, Bernhard, Onnela, Antti, Petäjä, Tuukka, Pfeifer, Joschka, Philippov, Maxim, Ranjithkumar, Ananth, Rissanen, Matti P., Schobesberger, Siegfried, Scholz, Wiebke, Schulze, Benjamin, Surdu, Mihnea, Thakur, Roseline C., Tomé, António, Wagner, Andrea C., Wang, Dongyu, Wang, Yonghong, Weber, Stefan K., Welti, André, Winkler, Paul M., Zauner-Wieczorek, Marcel, Baltensperger, Urs, Curtius, Joachim, Kurtén, Theo, Worsnop, Douglas R., Volkamer, Rainer, Lehtipalo, Katrianne, Kirkby, Jasper, Donahue, Neil M., Sipilä, Mikko, Kulmala, Markku, He, Xu-Cheng, Simon, Mario, Iyer, Siddharth, Xie, Hong-Bin, Rörup, Birte, Shen, Jiali, Finkenzeller, Henning, Stolzenburg, Dominik, Zhang, Rongjie, Baccarini, Andrea, Tham, Yee Jun, Wang, Mingyi, Amanatidis, Stavros, Piedehierro, Ana A., Amorim, Antonio, Baalbaki, Rima, Brasseur, Zoé, Caudillo, Lucía, Chu, Biwu, Dada, Lubna, Duplissy, Jonathan, El Haddad, Imad, Flagan, Richard C., Granzin, Manuel, Hansel, Armin, Heinritzi, Martin, Hofbauer, Victoria, Jokinen, Tuija, Kemppainen, Deniz, Kong, Weimeng, Krechmer, Jordan, Kürten, Andreas, Lamkaddam, Houssni, Lopez, Brandon, Ma, Fangfang, Mahfouz, Naser G. A., Makhmutov, Vladimir, Manninen, Hanna E., Marie, Guillaume, Marten, Ruby, Massabò, Dario, Mauldin, Roy L., Mentler, Bernhard, Onnela, Antti, Petäjä, Tuukka, Pfeifer, Joschka, Philippov, Maxim, Ranjithkumar, Ananth, Rissanen, Matti P., Schobesberger, Siegfried, Scholz, Wiebke, Schulze, Benjamin, Surdu, Mihnea, Thakur, Roseline C., Tomé, António, Wagner, Andrea C., Wang, Dongyu, Wang, Yonghong, Weber, Stefan K., Welti, André, Winkler, Paul M., Zauner-Wieczorek, Marcel, Baltensperger, Urs, Curtius, Joachim, Kurtén, Theo, Worsnop, Douglas R., Volkamer, Rainer, Lehtipalo, Katrianne, Kirkby, Jasper, Donahue, Neil M., Sipilä, Mikko, and Kulmala, Markku

Abstract

The main nucleating vapor in the atmosphere is thought to be sulfuric acid (H2SO4), stabilized by ammonia (NH3). However, in marine and polar regions, NH3 is generally low, and H2SO4 is frequently found together with iodine oxoacids [HIOx, i.e., iodic acid (HIO3) and iodous acid (HIO2)]. In experiments performed with the CERN CLOUD (Cosmics Leaving OUtdoor Droplets) chamber, we investigated the interplay of H2SO4 and HIOx during atmospheric particle nucleation. We found that HIOx greatly enhances H2SO4(-NH3) nucleation through two different interactions. First, HIO3 strongly binds with H2SO4 in charged clusters so they drive particle nucleation synergistically. Second, HIO2 substitutes for NH3, forming strongly bound H2SO4-HIO2 acid-base pairs in molecular clusters. Global observations imply that HIOx is enhancing H2SO4(-NH3) nucleation rates 10- to 10,000-fold in marine and polar regions.

Published
2023

13. The gas-phase formation mechanism of iodic acid as an atmospheric aerosol source

Author

Finkenzeller, Henning, primary, Iyer, Siddharth, additional, He, Xu-Cheng, additional, Simon, Mario, additional, Koenig, Theodore K., additional, Lee, Christopher F., additional, Valiev, Rashid, additional, Hofbauer, Victoria, additional, Amorim, Antonio, additional, Baalbaki, Rima, additional, Baccarini, Andrea, additional, Beck, Lisa, additional, Bell, David M., additional, Caudillo, Lucía, additional, Chen, Dexian, additional, Chiu, Randall, additional, Chu, Biwu, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Heinritzi, Martin, additional, Kemppainen, Deniz, additional, Kim, Changhyuk, additional, Krechmer, Jordan, additional, Kürten, Andreas, additional, Kvashnin, Alexandr, additional, Lamkaddam, Houssni, additional, Lee, Chuan Ping, additional, Lehtipalo, Katrianne, additional, Li, Zijun, additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marie, Guillaume, additional, Marten, Ruby, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Müller, Tatjana, additional, Petäjä, Tuukka, additional, Philippov, Maxim, additional, Ranjithkumar, Ananth, additional, Rörup, Birte, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Tauber, Christian, additional, Tham, Yee Jun, additional, Tomé, António, additional, Vazquez-Pufleau, Miguel, additional, Wagner, Andrea C., additional, Wang, Dongyu S., additional, Wang, Mingyi, additional, Wang, Yonghong, additional, Weber, Stefan K., additional, Nie, Wei, additional, Wu, Yusheng, additional, Xiao, Mao, additional, Ye, Qing, additional, Zauner-Wieczorek, Marcel, additional, Hansel, Armin, additional, Baltensperger, Urs, additional, Brioude, Jérome, additional, Curtius, Joachim, additional, Donahue, Neil M., additional, Haddad, Imad El, additional, Flagan, Richard C., additional, Kulmala, Markku, additional, Kirkby, Jasper, additional, Sipilä, Mikko, additional, Worsnop, Douglas R., additional, Kurten, Theo, additional, Rissanen, Matti, additional, and Volkamer, Rainer, additional

Published
2022
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14. High Gas-Phase Methanesulfonic Acid Production in the OH-Initiated Oxidation of Dimethyl Sulfide at Low Temperatures

Author

Shen, Jiali, primary, Scholz, Wiebke, additional, He, Xu-Cheng, additional, Zhou, Putian, additional, Marie, Guillaume, additional, Wang, Mingyi, additional, Marten, Ruby, additional, Surdu, Mihnea, additional, Rörup, Birte, additional, Baalbaki, Rima, additional, Amorim, Antonio, additional, Ataei, Farnoush, additional, Bell, David M., additional, Bertozzi, Barbara, additional, Brasseur, Zoé, additional, Caudillo, Lucía, additional, Chen, Dexian, additional, Chu, Biwu, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, Granzin, Manuel, additional, Guida, Roberto, additional, Heinritzi, Martin, additional, Hofbauer, Victoria, additional, Iyer, Siddharth, additional, Kemppainen, Deniz, additional, Kong, Weimeng, additional, Krechmer, Jordan E., additional, Kürten, Andreas, additional, Lamkaddam, Houssni, additional, Lee, Chuan Ping, additional, Lopez, Brandon, additional, Mahfouz, Naser G. A., additional, Manninen, Hanna E., additional, Massabò, Dario, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Müller, Tatjana, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Roldin, Pontus, additional, Schobesberger, Siegfried, additional, Simon, Mario, additional, Stolzenburg, Dominik, additional, Tham, Yee Jun, additional, Tomé, António, additional, Umo, Nsikanabasi Silas, additional, Wang, Dongyu, additional, Wang, Yonghong, additional, Weber, Stefan K., additional, Welti, André, additional, Wollesen de Jonge, Robin, additional, Wu, Yusheng, additional, Zauner-Wieczorek, Marcel, additional, Zust, Felix, additional, Baltensperger, Urs, additional, Curtius, Joachim, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Möhler, Ottmar, additional, Petäjä, Tuukka, additional, Volkamer, Rainer, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Rissanen, Matti, additional, Kirkby, Jasper, additional, El-Haddad, Imad, additional, Bianchi, Federico, additional, Sipilä, Mikko, additional, Donahue, Neil M., additional, and Worsnop, Douglas R., additional

Published
2022
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15. An intercomparison study of four different techniques for measuring the chemical composition of nanoparticles

Author

Caudillo, Lucía, primary, Surdu, Mihnea, additional, Lopez, Brandon, additional, Wang, Mingyi, additional, Thoma, Markus, additional, Bräkling, Steffen, additional, Buchholz, Angela, additional, Simon, Mario, additional, Wagner, Andrea C., additional, Müller, Tatjana, additional, Granzin, Manuel, additional, Heinritzi, Martin, additional, Amorim, Antonio, additional, Bell, David M., additional, Brasseur, Zoé, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, He, Xu-Cheng, additional, Lamkaddam, Houssni, additional, Mahfouz, Naser G. A., additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marie, Guillaume, additional, Marten, Ruby, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Onnela, Antti, additional, Petäjä, Tuukka, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Rörup, Birte, additional, Scholz, Wiebke, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Tauber, Christian, additional, Tian, Ping, additional, Tomé, António, additional, Umo, Nsikanabasi Silas, additional, Wang, Dongyu S., additional, Wang, Yonghong, additional, Weber, Stefan K., additional, Welti, André, additional, Zauner-Wieczorek, Marcel, additional, Baltensperger, Urs, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Kirkby, Jasper, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Worsnop, Douglas R., additional, Haddad, Imad El, additional, Donahue, Neil M., additional, Vogel, Alexander L., additional, Kürten, Andreas, additional, and Curtius, Joachim, additional

Published
2022
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16. Supplementary material to "An intercomparison study of four different techniques for measuring the chemical composition of nanoparticles"

Author

Caudillo, Lucía, primary, Surdu, Mihnea, additional, Lopez, Brandon, additional, Wang, Mingyi, additional, Thoma, Markus, additional, Bräkling, Steffen, additional, Buchholz, Angela, additional, Simon, Mario, additional, Wagner, Andrea C., additional, Müller, Tatjana, additional, Granzin, Manuel, additional, Heinritzi, Martin, additional, Amorim, Antonio, additional, Bell, David M., additional, Brasseur, Zoé, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, He, Xu-Cheng, additional, Lamkaddam, Houssni, additional, Mahfouz, Naser G. A., additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marie, Guillaume, additional, Marten, Ruby, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Onnela, Antti, additional, Petäjä, Tuukka, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Rörup, Birte, additional, Scholz, Wiebke, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Tauber, Christian, additional, Tian, Ping, additional, Tomé, António, additional, Umo, Nsikanabasi Silas, additional, Wang, Dongyu S., additional, Wang, Yonghong, additional, Weber, Stefan K., additional, Welti, André, additional, Zauner-Wieczorek, Marcel, additional, Baltensperger, Urs, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Kirkby, Jasper, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Worsnop, Douglas R., additional, Haddad, Imad El, additional, Donahue, Neil M., additional, Vogel, Alexander L., additional, Kürten, Andreas, additional, and Curtius, Joachim, additional

Published
2022
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18. Direct Observations of Atmospheric Aerosol Nucleation

Author

Kulmala, Markku, Kontkanen, Jenni, Junninen, Heikki, Lehtipalo, Katrianne, Manninen, Hanna E., Nieminen, Tuomo, Petäjä, Tuukka, Sipilä, Mikko, Schobesberger, Siegfried, Rantala, Pekka, Franchin, Alessandro, Jokinen, Tuija, Järvinen, Emma, Äijälä, Mikko, Kangasluoma, Juha, Hakala, Jani, Aalto, Pasi P., Paasonen, Pauli, Mikkila, Jyri, Vanhanen, Joonas, Aalto, Juho, Hakola, Hannele, Makkonen, Ulla, Ruuskanen, Taina, Mauldin, Roy L., Duplissy, Jonathan, Vehkamäki, Hanna, Bäck, Jaana, Kortelainen, Aki, Riipinen, Ilona, Kurtán, Theo, Johnston, Murray V., Smith, James N., Ehn, Mikael, Mentel, Thomas F., Lehtinen, Kari E. J., Laaksonen, Ari, Kerminen, Veli-Matti, and Worsnop, Douglas R.

Published
2013
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20. Chemical composition of nanoparticles from <i>α</i>-pinene nucleation and the influence of isoprene and relative humidity at low temperature

Author

Caudillo, Lucía, primary, Rörup, Birte, additional, Heinritzi, Martin, additional, Marie, Guillaume, additional, Simon, Mario, additional, Wagner, Andrea C., additional, Müller, Tatjana, additional, Granzin, Manuel, additional, Amorim, Antonio, additional, Ataei, Farnoush, additional, Baalbaki, Rima, additional, Bertozzi, Barbara, additional, Brasseur, Zoé, additional, Chiu, Randall, additional, Chu, Biwu, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, Gonzalez Carracedo, Loïc, additional, He, Xu-Cheng, additional, Hofbauer, Victoria, additional, Kong, Weimeng, additional, Lamkaddam, Houssni, additional, Lee, Chuan P., additional, Lopez, Brandon, additional, Mahfouz, Naser G. A., additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marten, Ruby, additional, Massabò, Dario, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Molteni, Ugo, additional, Onnela, Antti, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Schervish, Meredith, additional, Scholz, Wiebke, additional, Schulze, Benjamin, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Stozhkov, Yuri, additional, Surdu, Mihnea, additional, Tauber, Christian, additional, Tham, Yee Jun, additional, Tian, Ping, additional, Tomé, António, additional, Vogt, Steffen, additional, Wang, Mingyi, additional, Wang, Dongyu S., additional, Weber, Stefan K., additional, Welti, André, additional, Yonghong, Wang, additional, Yusheng, Wu, additional, Zauner-Wieczorek, Marcel, additional, Baltensperger, Urs, additional, El Haddad, Imad, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Höhler, Kristina, additional, Kirkby, Jasper, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Möhler, Ottmar, additional, Saathoff, Harald, additional, Volkamer, Rainer, additional, Winkler, Paul M., additional, Donahue, Neil M., additional, Kürten, Andreas, additional, and Curtius, Joachim, additional

Published
2021
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21. Rapid cycling of reactive nitrogen in the marine boundary layer

Author

Ye, Chunxiang, Zhou, Xianliang, Pu, Dennis, Stutz, Jochen, Festa, James, Spolaor, Max, Tsai, Catalina, Cantrell, Christopher, Mauldin, Roy L., Campos, Teresa, Weinheimer, Andrew, Hornbrook, Rebecca S., Apel, Eric C., Guenther, Alex, Kaser, Lisa, Yuan, Bin, Karl, Thomas, Haggerty, Julie, Hall, Samuel, Ullmann, Kirk, Smith, James N., Ortega, John, and Knote, Christoph

Published
2016
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22. The driving factors of new particle formation and growth in the polluted boundary layer

Author

Xiao, Mao, primary, Hoyle, Christopher R., additional, Dada, Lubna, additional, Stolzenburg, Dominik, additional, Kürten, Andreas, additional, Wang, Mingyi, additional, Lamkaddam, Houssni, additional, Garmash, Olga, additional, Mentler, Bernhard, additional, Molteni, Ugo, additional, Baccarini, Andrea, additional, Simon, Mario, additional, He, Xu-Cheng, additional, Lehtipalo, Katrianne, additional, Ahonen, Lauri R., additional, Baalbaki, Rima, additional, Bauer, Paulus S., additional, Beck, Lisa, additional, Bell, David, additional, Bianchi, Federico, additional, Brilke, Sophia, additional, Chen, Dexian, additional, Chiu, Randall, additional, Dias, António, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, Gordon, Hamish, additional, Hofbauer, Victoria, additional, Kim, Changhyuk, additional, Koenig, Theodore K., additional, Lampilahti, Janne, additional, Lee, Chuan Ping, additional, Li, Zijun, additional, Mai, Huajun, additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marten, Ruby, additional, Mathot, Serge, additional, Mauldin, Roy L., additional, Nie, Wei, additional, Onnela, Antti, additional, Partoll, Eva, additional, Petäjä, Tuukka, additional, Pfeifer, Joschka, additional, Pospisilova, Veronika, additional, Quéléver, Lauriane L. J., additional, Rissanen, Matti, additional, Schobesberger, Siegfried, additional, Schuchmann, Simone, additional, Stozhkov, Yuri, additional, Tauber, Christian, additional, Tham, Yee Jun, additional, Tomé, António, additional, Vazquez-Pufleau, Miguel, additional, Wagner, Andrea C., additional, Wagner, Robert, additional, Wang, Yonghong, additional, Weitz, Lena, additional, Wimmer, Daniela, additional, Wu, Yusheng, additional, Yan, Chao, additional, Ye, Penglin, additional, Ye, Qing, additional, Zha, Qiaozhi, additional, Zhou, Xueqin, additional, Amorim, Antonio, additional, Carslaw, Ken, additional, Curtius, Joachim, additional, Hansel, Armin, additional, Volkamer, Rainer, additional, Winkler, Paul M., additional, Flagan, Richard C., additional, Kulmala, Markku, additional, Worsnop, Douglas R., additional, Kirkby, Jasper, additional, Donahue, Neil M., additional, Baltensperger, Urs, additional, El Haddad, Imad, additional, and Dommen, Josef, additional

Published
2021
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23. Role of iodine oxoacids in atmospheric aerosol nucleation

Author

He, Xu-Cheng, Tham, Yee Jun, Dada, Lubna, Wang, Mingyi, Finkenzeller, Henning, Stolzenburg, Dominik, Iyer, Siddharth, Simon, Mario, Kürten, Andreas, Shen, Jiali, Rörup, Birte, Rissanen, Matti, Schobesberger, Siegfried, Baalbaki, Rima, Wang, Dongyu S., Koenig, Theodore K., Jokinen, Tuija, Sarnela, Nina, Beck, Lisa J., Almeida, João, Amanatidis, Stavros, Amorim, António, Ataei, Farnoush, Baccarini, Andrea, Bertozzi, Barbara, Bianchi, Federico, Brilke, Sophia, Caudillo, Lucía, Chen, Dexian, Chiu, Randall, Chu, Biwu, Dias, António, Ding, Aijun, Dommen, Josef, Duplissy, Jonathan, El Haddad, Imad, Gonzalez Carracedo, Loïc, Granzin, Manuel, Hansel, Armin, Heinritzi, Martin, Hofbauer, Victoria, Junninen, Heikki, Kangasluoma, Juha, Kemppainen, Deniz, Kim, Changhyuk, Kong, Weimeng, Krechmer, Jordan E., Kvashin, Aleksander, Laitinen, Totti, Lamkaddam, Houssni, Lee, Chuan Ping, Lehtipalo, Katrianne, Leiminger, Markus, Li, Zijun, Makhmutov, Vladimir, Manninen, Hanna E., Marie, Guillaume, Marten, Ruby, Mathot, Serge, Mauldin, Roy L., Mentler, Bernhard, Möhler, Ottmar, Müller, Tatjana, Nie, Wei, Onnela, Antti, Petäjä, Tuukka, Pfeifer, Joschka, Philippov, Maxim, Ranjithkumar, Ananth, Saiz-Lopez, Alfonso, Salma, Imre, Scholz, Wiebke, Schuchmann, Simone, Schulze, Benjamin, Steiner, Gerhard, Stozhkov, Yuri, Tauber, Christian, Tomé, António, Thakur, Roseline C., Väisänen, Olli, Vazquez-Pufleau, Miguel, Wagner, Andrea C., Wang, Yonghong, Weber, Stefan K., Winkler, Paul M., Wu, Yusheng, Xiao, Mao, Yan, Chao, Ye, Qing, Ylisirniö, Arttu, Zauner-Wieczorek, Marcel, Zha, Qiaozhi, Zhou, Putian, Flagan, Richard C., Curtius, Joachim, Baltensperger, Urs, Kulmala, Markku, Kerminen, Veli-Matti, Kurtén, Theo, Donahue, Neil M., Volkamer, Rainer, Kirkby, Jasper, Worsnop, Douglas R., Sipilä, Mikko, Tampere University, Physics, European Organization for Nuclear Research, Academy of Finland, European Commission, Consejo Superior de Investigaciones Científicas (España), Austrian Science Fund, Swiss National Science Foundation, National Science Foundation (US), Federal Ministry of Education and Research (Germany), Fundação para a Ciência e a Tecnologia (Portugal), Jiangsu Collaborative Innovation Center of Climate Change, Estonian Research Council, National Research, Development and Innovation Office (Hungary), and National Aeronautics and Space Administration (US)

Subjects
Earth sciences, ddc:550, 114 Physical sciences
Abstract

8 pags., 5 figs., Iodic acid (HIO) is known to form aerosol particles in coastal marine regions, but predicted nucleation and growth rates are lacking. Using the CERN CLOUD (Cosmics Leaving Outdoor Droplets) chamber, we find that the nucleation rates of HIOparticles are rapid, even exceeding sulfuric acid-ammonia rates under similar conditions. We also find that ion-induced nucleation involves IOand the sequential addition of HIOand that it proceeds at the kinetic limit below +10°C. In contrast, neutral nucleation involves the repeated sequential addition of iodous acid (HIO) followed by HIO, showing that HIOplays a key stabilizing role. Freshly formed particles are composed almost entirely of HIO, which drives rapid particle growth at the kinetic limit. Our measurements indicate that iodine oxoacid particle formation can compete with sulfuric acid in pristine regions of the atmosphere., We thank the European Organization for Nuclear Research (CERN) for supporting CLOUD with important technical and financial resources and for providing a particle beam from the CERN Proton Synchrotron. This research has received support from the Academy of Finland (projects 316114, 307331, 310682, 266388, 3282290, 306853, 296628, 229574, 333397, 326948, and 1325656); the European Research Council (projects 692891, 616075, 764991, 316662, 742206, and 714621); CSC – Finnish IT center; the EC Seventh Framework Programme and the EU H2020 programme Marie Skłodowska Curie ITN “CLOUD-TRAIN” (316662) and “CLOUD-MOTION” (764991); Austrian Science Fund (FWF) (J3951-N36 and P27295-N20); the Swiss National Science Foundation (20FI20_159851, 200021_169090, 200020_172602, and 20FI20_172622); the U.S. National Science Foundation (grants AGS1447056, AGS1439551, AGS1801574, AGS1620530, AGS1801897, AGS153128, AGS1649147, AGS1801280, AGS1602086, and AGS1801329); MSCA H2020 COFUND-FP-CERN2014 fellowship (665779); German Federal Ministry of Education and Research: CLOUD-16 (01LK1601A); Portuguese Foundation for Science and Technology (CERN/FIS-COM/0014/2017); Academy of Finland Centre of Excellence in Atmospheric Sciences (grant 272041); European Regional Development Fund (project MOBTT42); Jiangsu Collaborative Innovation Center for Climate Change; Yangtze River Delta Atmosphere and Earth System Science National Observation and Research Station; Estonian Research Council (project PRG714); Hungarian National Research, Development and Innovation Office (K116788 and K132254); NASA Graduate Fellowship (NASA-NNX16AP36H); and ACTRIS 2TNA H2020 OCTAVE (654109).

Published
2021

24. Supplementary material to "Chemical composition of nanoparticles from α-pinene nucleation and the influence of isoprene and relative humidity at low temperature"

Author

Caudillo, Lucía, primary, Rörup, Birte, additional, Heinritzi, Martin, additional, Marie, Guillaume, additional, Simon, Mario, additional, Wagner, Andrea C., additional, Müller, Tatjana, additional, Granzin, Manuel, additional, Amorim, Antonio, additional, Ataei, Farnoush, additional, Baalbaki, Rima, additional, Bertozzi, Barbara, additional, Brasseur, Zoé, additional, Chiu, Randall, additional, Chu, Biwu, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, Gonzalez Carracedo, Loïc, additional, He, Xu-Cheng, additional, Hofbauer, Victoria, additional, Kong, Weimeng, additional, Lamkaddam, Houssni, additional, Lee, Chuan P., additional, Lopez, Brandon, additional, Mahfouz, Naser G. A., additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marten, Ruby, additional, Massabò, Dario, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Molteni, Ugo, additional, Onnela, Antti, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Schervish, Meredith, additional, Scholz, Wiebke, additional, Schulze, Benjamin, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Stozhkov, Yuri, additional, Surdu, Mihnea, additional, Tauber, Christian, additional, Tham, Yee Jun, additional, Tian, Ping, additional, Tomé, António, additional, Vogt, Steffen, additional, Wang, Mingyi, additional, Wang, Dongyu S., additional, Weber, Stefan K., additional, Welti, André, additional, Yonghong, Wang, additional, Yusheng, Wu, additional, Zauner-Wieczorek, Marcel, additional, Baltensperger, Urs, additional, El Haddad, Imad, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Höhler, Kristina, additional, Kirkby, Jasper, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Möhler, Ottmar, additional, Saathoff, Harald, additional, Volkamer, Rainer, additional, Winkler, Paul M., additional, Donahue, Neil M., additional, Kürten, Andreas, additional, and Curtius, Joachim, additional

Published
2021
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25. Chemical composition of nanoparticles from α-pinene nucleation and the influence of isoprene and relative humidity at low temperature

Author

Caudillo, Lucía, primary, Rörup, Birte, additional, Heinritzi, Martin, additional, Marie, Guillaume, additional, Simon, Mario, additional, Wagner, Andrea C., additional, Müller, Tatjana, additional, Granzin, Manuel, additional, Amorim, Antonio, additional, Ataei, Farnoush, additional, Baalbaki, Rima, additional, Bertozzi, Barbara, additional, Brasseur, Zoé, additional, Chiu, Randall, additional, Chu, Biwu, additional, Dada, Lubna, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, Gonzalez Carracedo, Loïc, additional, He, Xu-Cheng, additional, Hofbauer, Victoria, additional, Kong, Weimeng, additional, Lamkaddam, Houssni, additional, Lee, Chuan P., additional, Lopez, Brandon, additional, Mahfouz, Naser G. A., additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marten, Ruby, additional, Massabò, Dario, additional, Mauldin, Roy L., additional, Mentler, Bernhard, additional, Molteni, Ugo, additional, Onnela, Antti, additional, Pfeifer, Joschka, additional, Philippov, Maxim, additional, Piedehierro, Ana A., additional, Schervish, Meredith, additional, Scholz, Wiebke, additional, Schulze, Benjamin, additional, Shen, Jiali, additional, Stolzenburg, Dominik, additional, Stozhkov, Yuri, additional, Surdu, Mihnea, additional, Tauber, Christian, additional, Tham, Yee Jun, additional, Tian, Ping, additional, Tomé, António, additional, Vogt, Steffen, additional, Wang, Mingyi, additional, Wang, Dongyu S., additional, Weber, Stefan K., additional, Welti, André, additional, Yonghong, Wang, additional, Yusheng, Wu, additional, Zauner-Wieczorek, Marcel, additional, Baltensperger, Urs, additional, El Haddad, Imad, additional, Flagan, Richard C., additional, Hansel, Armin, additional, Höhler, Kristina, additional, Kirkby, Jasper, additional, Kulmala, Markku, additional, Lehtipalo, Katrianne, additional, Möhler, Ottmar, additional, Saathoff, Harald, additional, Volkamer, Rainer, additional, Winkler, Paul M., additional, Donahue, Neil M., additional, Kürten, Andreas, additional, and Curtius, Joachim, additional

Published
2021
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26. Chemical composition of nanoparticles from α-pinene nucleation and the influence of isoprene and relative humidity at low temperature

Author

Caudillo, Lucía, Rörup, Birte, Heinritzi, Martin, Marie, Guillaume, Simon, Mario, Wagner, Andrea C., Müller, Tatjana, Granzin, Manuel, Amorim, Antonio, Ataei, Farnoush, Baalbaki, Rima, Bertozzi, Barbara, Brasseur, Zoé, Chiu, Randall, Chu, Biwu, Dada, Lubna, Duplissy, Jonathan, Finkenzeller, Henning, Gonzalez Carracedo, Loïc, He, Xu-Cheng, Hofbauer, Victoria, Kong, Weimeng, Lamkaddam, Houssni, Lee, Chuan P., Lopez, Brandon, Mahfouz, Naser G. A., Makhmutov, Vladimir, Manninen, Hanna E., Marten, Ruby, Massabò, Dario, Mauldin, Roy L., Mentler, Bernhard, Molteni, Ugo, Onnela, Antti, Pfeifer, Joschka, Philippov, Maxim, Piedehierro, Ana A., Schervish, Meredith, Scholz, Wiebke, Schulze, Benjamin, Shen, Jiali, Stolzenburg, Dominik, Stozhkov, Yuri, Surdu, Mihnea, Tauber, Christian, Tham, Yee Jun, Tian, Ping, Tomé, António, Vogt, Steffen, Wang, Mingyi, Wang, Dongyu S., Weber, Stefan K., Welti, André, Yonghong, Wang, Yusheng, Wu, Zauner-Wieczorek, Marcel, Baltensperger, Urs, El Haddad, Imad, Flagan, Richard C., Hansel, Armin, Höhler, Kristina, Kirkby, Jasper, Kulmala, Markku, Lehtipalo, Katrianne, Möhler, Ottmar, Saathoff, Harald, Volkamer, Rainer, Winkler, Paul M., Donahue, Neil M., Kürten, Andreas, and Curtius, Joachim

Subjects
Atmospheric Science
Abstract

The abstract is available here: https://uscholar.univie.ac.at/o:1597268

Published
2021

27. Role of iodine oxoacids in atmospheric aerosol nucleation

Author

European Organization for Nuclear Research, Academy of Finland, European Commission, Consejo Superior de Investigaciones Científicas (España), Austrian Science Fund, Swiss National Science Foundation, National Science Foundation (US), Federal Ministry of Education and Research (Germany), Fundação para a Ciência e a Tecnologia (Portugal), Jiangsu Collaborative Innovation Center of Climate Change, Estonian Research Council, National Research, Development and Innovation Office (Hungary), National Aeronautics and Space Administration (US), He, Xu-Cheng, Tham, Yee Jun, Dada, Lubna, Wang, Mingyi, Finkenzeller, Henning, Stolzenburg, D., Iyer, S., Simon, Mario, Kürten, A., Shen, Jiali, Rörup, Birte, Volkamer, Rainer, Kirkby, Jasper, Worsnop, Douglas R., Sipilä, Mikko, Rissanen, Matti, Schobesberger, Siegfried, Baalbaki, Rima, Wang, Dongyo S., Koenig, T.K., Jokinen, Tuija, Sarnela, Nina, Beck, Lisa J., Almeida, João, Amanatidis, Stavros, Amorim, António, Ataei, F., Baccarini, Andrea, Bertozzi, Barbara, Bianchi, Federico, Brilke, Sophia, Caudillo, Lucía, Chen, Dexian, Chiu, Randall, Chu, Biwu, Dias, A., Ding, Aijun, Dommen, J., Duplissy, Jonathan, El Haddad, I., González Carracedo, Loïc, Granzin, Manuel, Hansel, A., Heinritzi, Martin, Hofbauer, Victoria, Junninen, Heikki, Kangasluoma, Juha, Kemppainen, Deniz, Kim, Changyuk, Kong, Weimeng, Krechmer, Jordan E., Kvashin, Aleksander, Laitinen, Totti, Lamkaddam, Houssni, Lee, Chuan Ping, Lehtipalo, Katrianne, Leiminger, Markus, Li, Zijun, Makhmutov, Vladimir, Manninen, Hanna E., Marie, Guillaume, Marten, Ruby, Mathot, Serge, Mauldin, Roy L., Mentler, Bernhard, Möhler, Ottmar, Müller, Tatjana, Nie, Wei, Onnela, Antti, Petäjä, Tuukka, Pfeifer, Joschka, Philippov, Maxim, Ranjithkumar, Ananth, Saiz-Lopez, A., Salma, Imre, Scholz, Wiebke, Schuchmann, S., Schulze, Benjamin, Steiner, Gerhard, Stozhkov, Yuri, Tauber, Christian, Tomé, António, Thakur, Roseline C., Väisänen, Olli, Vazquez-Pufleau, Miguel, Wagner, Andrea C., Wang, Yonghong, Weber, Stefan K., Winkler, Paul M., Wu, Yusheng, Xiao, Mao, Yan, Chao, Ye, Qing, Ylisirniö, Arttu, Zauner-Wieczorek, Marcel, Zha, Qiaozhi, Zhou, Putian, Flagan, Richard C., Curtius, Joachim, Baltensperger, Urs, Kulmala, Markku, Kerminen, Veli Matti, Kurtén, Theo, Donahue, Neil M., European Organization for Nuclear Research, Academy of Finland, European Commission, Consejo Superior de Investigaciones Científicas (España), Austrian Science Fund, Swiss National Science Foundation, National Science Foundation (US), Federal Ministry of Education and Research (Germany), Fundação para a Ciência e a Tecnologia (Portugal), Jiangsu Collaborative Innovation Center of Climate Change, Estonian Research Council, National Research, Development and Innovation Office (Hungary), National Aeronautics and Space Administration (US), He, Xu-Cheng, Tham, Yee Jun, Dada, Lubna, Wang, Mingyi, Finkenzeller, Henning, Stolzenburg, D., Iyer, S., Simon, Mario, Kürten, A., Shen, Jiali, Rörup, Birte, Volkamer, Rainer, Kirkby, Jasper, Worsnop, Douglas R., Sipilä, Mikko, Rissanen, Matti, Schobesberger, Siegfried, Baalbaki, Rima, Wang, Dongyo S., Koenig, T.K., Jokinen, Tuija, Sarnela, Nina, Beck, Lisa J., Almeida, João, Amanatidis, Stavros, Amorim, António, Ataei, F., Baccarini, Andrea, Bertozzi, Barbara, Bianchi, Federico, Brilke, Sophia, Caudillo, Lucía, Chen, Dexian, Chiu, Randall, Chu, Biwu, Dias, A., Ding, Aijun, Dommen, J., Duplissy, Jonathan, El Haddad, I., González Carracedo, Loïc, Granzin, Manuel, Hansel, A., Heinritzi, Martin, Hofbauer, Victoria, Junninen, Heikki, Kangasluoma, Juha, Kemppainen, Deniz, Kim, Changyuk, Kong, Weimeng, Krechmer, Jordan E., Kvashin, Aleksander, Laitinen, Totti, Lamkaddam, Houssni, Lee, Chuan Ping, Lehtipalo, Katrianne, Leiminger, Markus, Li, Zijun, Makhmutov, Vladimir, Manninen, Hanna E., Marie, Guillaume, Marten, Ruby, Mathot, Serge, Mauldin, Roy L., Mentler, Bernhard, Möhler, Ottmar, Müller, Tatjana, Nie, Wei, Onnela, Antti, Petäjä, Tuukka, Pfeifer, Joschka, Philippov, Maxim, Ranjithkumar, Ananth, Saiz-Lopez, A., Salma, Imre, Scholz, Wiebke, Schuchmann, S., Schulze, Benjamin, Steiner, Gerhard, Stozhkov, Yuri, Tauber, Christian, Tomé, António, Thakur, Roseline C., Väisänen, Olli, Vazquez-Pufleau, Miguel, Wagner, Andrea C., Wang, Yonghong, Weber, Stefan K., Winkler, Paul M., Wu, Yusheng, Xiao, Mao, Yan, Chao, Ye, Qing, Ylisirniö, Arttu, Zauner-Wieczorek, Marcel, Zha, Qiaozhi, Zhou, Putian, Flagan, Richard C., Curtius, Joachim, Baltensperger, Urs, Kulmala, Markku, Kerminen, Veli Matti, Kurtén, Theo, and Donahue, Neil M.

Abstract

Iodic acid (HIO) is known to form aerosol particles in coastal marine regions, but predicted nucleation and growth rates are lacking. Using the CERN CLOUD (Cosmics Leaving Outdoor Droplets) chamber, we find that the nucleation rates of HIOparticles are rapid, even exceeding sulfuric acid-ammonia rates under similar conditions. We also find that ion-induced nucleation involves IOand the sequential addition of HIOand that it proceeds at the kinetic limit below +10°C. In contrast, neutral nucleation involves the repeated sequential addition of iodous acid (HIO) followed by HIO, showing that HIOplays a key stabilizing role. Freshly formed particles are composed almost entirely of HIO, which drives rapid particle growth at the kinetic limit. Our measurements indicate that iodine oxoacid particle formation can compete with sulfuric acid in pristine regions of the atmosphere.

Published
2021

28. Supplementary material to "The driving factors of new particle formation and growth in the polluted boundary layer"

Author

Xiao, Mao, primary, Hoyle, Christopher R., additional, Dada, Lubna, additional, Stolzenburg, Dominik, additional, Kürten, Andreas, additional, Wang, Mingyi, additional, Lamkaddam, Houssni, additional, Garmash, Olga, additional, Mentler, Bernhard, additional, Molteni, Ugo, additional, Baccarini, Andrea, additional, Simon, Mario, additional, He, Xu-Cheng, additional, Lehtipalo, Katrianne, additional, Ahonen, Lauri R., additional, Baalbaki, Rima, additional, Bauer, Paulus S., additional, Beck, Lisa, additional, Bell, David, additional, Bianchi, Federico, additional, Brilke, Sophia, additional, Chen, Dexian, additional, Chiu, Randall, additional, Dias, António, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, Gordon, Hamish, additional, Hofbauer, Victoria, additional, Kim, Changhyuk, additional, Koenig, Theodore K., additional, Lampilahti, Janne, additional, Lee, Chuan Ping, additional, Li, Zijun, additional, Mai, Huajun, additional, Makhmutov, Vladimir, additional, Manninen, Hanna E., additional, Marten, Ruby, additional, Mathot, Serge, additional, Mauldin, Roy L., additional, Nie, Wei, additional, Onnela, Antti, additional, Partoll, Eva, additional, Petäjä, Tuukka, additional, Pfeifer, Joschka, additional, Pospisilova, Veronika, additional, Quéléver, Lauriane L. J., additional, Rissanen, Matti, additional, Schobesberger, Siegfried, additional, Schuchmann, Simone, additional, Stozhkov, Yuri, additional, Tauber, Christian, additional, Tham, Yee Jun, additional, Tomé, António, additional, Vazquez-Pufleau, Miguel, additional, Wagner, Andrea C., additional, Wanger, Robert, additional, Wang, Yonghong, additional, Weitz, Lena, additional, Wimmer, Daniela, additional, Wu, Yusheng, additional, Yan, Chao, additional, Ye, Penglin, additional, Ye, Qing, additional, Zha, Qiaozhi, additional, Zhou, Xueqin, additional, Amorim, Antonio, additional, Carslaw, Ken, additional, Curtius, Joachim, additional, Hansel, Armin, additional, Volkamer, Rainer, additional, Winkler, Paul M., additional, Flagan, Richard C., additional, Kulmala, Markku, additional, Worsnop, Douglas R., additional, Kirkby, Jasper, additional, Donahue, Neil M., additional, Baltensperger, Urs, additional, El Haddad, Imad, additional, and Dommen, Josef, additional

Published
2021
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29. Photo-oxidation of Aromatic Hydrocarbons Produces Low-Volatility Organic Compounds

Author

Wang, Mingyi, primary, Chen, Dexian, additional, Xiao, Mao, additional, Ye, Qing, additional, Stolzenburg, Dominik, additional, Hofbauer, Victoria, additional, Ye, Penglin, additional, Vogel, Alexander L., additional, Mauldin, Roy L., additional, Amorim, Antonio, additional, Baccarini, Andrea, additional, Baumgartner, Bernhard, additional, Brilke, Sophia, additional, Dada, Lubna, additional, Dias, António, additional, Duplissy, Jonathan, additional, Finkenzeller, Henning, additional, Garmash, Olga, additional, He, Xu-Cheng, additional, Hoyle, Christopher R., additional, Kim, Changhyuk, additional, Kvashnin, Alexander, additional, Lehtipalo, Katrianne, additional, Fischer, Lukas, additional, Molteni, Ugo, additional, Petäjä, Tuukka, additional, Pospisilova, Veronika, additional, Quéléver, Lauriane L. J., additional, Rissanen, Matti, additional, Simon, Mario, additional, Tauber, Christian, additional, Tomé, António, additional, Wagner, Andrea C., additional, Weitz, Lena, additional, Volkamer, Rainer, additional, Winkler, Paul M., additional, Kirkby, Jasper, additional, Worsnop, Douglas R., additional, Kulmala, Markku, additional, Baltensperger, Urs, additional, Dommen, Josef, additional, El-Haddad, Imad, additional, and Donahue, Neil M., additional

Published
2020
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30. Synergistic HNO3–H2SO4–NH3upper tropospheric particle formation

Author

Wang, Mingyi, Xiao, Mao, Bertozzi, Barbara, Marie, Guillaume, Rörup, Birte, Schulze, Benjamin, Bardakov, Roman, He, Xu-Cheng, Shen, Jiali, Scholz, Wiebke, Marten, Ruby, Dada, Lubna, Baalbaki, Rima, Lopez, Brandon, Lamkaddam, Houssni, Manninen, Hanna E., Amorim, António, Ataei, Farnoush, Bogert, Pia, Brasseur, Zoé, Caudillo, Lucía, De Menezes, Louis-Philippe, Duplissy, Jonathan, Ekman, Annica M. L., Finkenzeller, Henning, Carracedo, Loïc Gonzalez, Granzin, Manuel, Guida, Roberto, Heinritzi, Martin, Hofbauer, Victoria, Höhler, Kristina, Korhonen, Kimmo, Krechmer, Jordan E., Kürten, Andreas, Lehtipalo, Katrianne, Mahfouz, Naser G. A., Makhmutov, Vladimir, Massabò, Dario, Mathot, Serge, Mauldin, Roy L., Mentler, Bernhard, Müller, Tatjana, Onnela, Antti, Petäjä, Tuukka, Philippov, Maxim, Piedehierro, Ana A., Pozzer, Andrea, Ranjithkumar, Ananth, Schervish, Meredith, Schobesberger, Siegfried, Simon, Mario, Stozhkov, Yuri, Tomé, António, Umo, Nsikanabasi Silas, Vogel, Franziska, Wagner, Robert, Wang, Dongyu S., Weber, Stefan K., Welti, André, Wu, Yusheng, Zauner-Wieczorek, Marcel, Sipilä, Mikko, Winkler, Paul M., Hansel, Armin, Baltensperger, Urs, Kulmala, Markku, Flagan, Richard C., Curtius, Joachim, Riipinen, Ilona, Gordon, Hamish, Lelieveld, Jos, El-Haddad, Imad, Volkamer, Rainer, Worsnop, Douglas R., Christoudias, Theodoros, Kirkby, Jasper, Möhler, Ottmar, and Donahue, Neil M.

Abstract

New particle formation in the upper free troposphere is a major global source of cloud condensation nuclei (CCN)1–4. However, the precursor vapours that drive the process are not well understood. With experiments performed under upper tropospheric conditions in the CERN CLOUD chamber, we show that nitric acid, sulfuric acid and ammonia form particles synergistically, at rates that are orders of magnitude faster than those from any two of the three components. The importance of this mechanism depends on the availability of ammonia, which was previously thought to be efficiently scavenged by cloud droplets during convection. However, surprisingly high concentrations of ammonia and ammonium nitrate have recently been observed in the upper troposphere over the Asian monsoon region5,6. Once particles have formed, co-condensation of ammonia and abundant nitric acid alone is sufficient to drive rapid growth to CCN sizes with only trace sulfate. Moreover, our measurements show that these CCN are also highly efficient ice nucleating particles—comparable to desert dust. Our model simulations confirm that ammonia is efficiently convected aloft during the Asian monsoon, driving rapid, multi-acid HNO3–H2SO4–NH3nucleation in the upper troposphere and producing ice nucleating particles that spread across the mid-latitude Northern Hemisphere.

Published
2022
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31. Molecular Composition and Volatility of Nucleated Particles from α-Pinene Oxidation between −50 °C and +25 °C

Author

Ye, Qing, primary, Wang, Mingyi, additional, Hofbauer, Victoria, additional, Stolzenburg, Dominik, additional, Chen, Dexian, additional, Schervish, Meredith, additional, Vogel, Alexander, additional, Mauldin, Roy L., additional, Baalbaki, Rima, additional, Brilke, Sophia, additional, Dada, Lubna, additional, Dias, António, additional, Duplissy, Jonathan, additional, El Haddad, Imad, additional, Finkenzeller, Henning, additional, Fischer, Lukas, additional, He, Xucheng, additional, Kim, Changhyuk, additional, Kürten, Andreas, additional, Lamkaddam, Houssni, additional, Lee, Chuan Ping, additional, Lehtipalo, Katrianne, additional, Leiminger, Markus, additional, Manninen, Hanna E., additional, Marten, Ruby, additional, Mentler, Bernhard, additional, Partoll, Eva, additional, Petäjä, Tuukka, additional, Rissanen, Matti, additional, Schobesberger, Siegfried, additional, Schuchmann, Simone, additional, Simon, Mario, additional, Tham, Yee Jun, additional, Vazquez-Pufleau, Miguel, additional, Wagner, Andrea C., additional, Wang, Yonghong, additional, Wu, Yusheng, additional, Xiao, Mao, additional, Baltensperger, Urs, additional, Curtius, Joachim, additional, Flagan, Richard, additional, Kirkby, Jasper, additional, Kulmala, Markku, additional, Volkamer, Rainer, additional, Winkler, Paul M., additional, Worsnop, Douglas, additional, and Donahue, Neil M., additional

Published
2019
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32. Multicomponent new particle formation from sulfuric acid, ammonia, and biogenic vapors

Author

Lehtipalo, Katrianne, primary, Yan, Chao, additional, Dada, Lubna, additional, Bianchi, Federico, additional, Xiao, Mao, additional, Wagner, Robert, additional, Stolzenburg, Dominik, additional, Ahonen, Lauri R., additional, Amorim, Antonio, additional, Baccarini, Andrea, additional, Bauer, Paulus S., additional, Baumgartner, Bernhard, additional, Bergen, Anton, additional, Bernhammer, Anne-Kathrin, additional, Breitenlechner, Martin, additional, Brilke, Sophia, additional, Buchholz, Angela, additional, Mazon, Stephany Buenrostro, additional, Chen, Dexian, additional, Chen, Xuemeng, additional, Dias, Antonio, additional, Dommen, Josef, additional, Draper, Danielle C., additional, Duplissy, Jonathan, additional, Ehn, Mikael, additional, Finkenzeller, Henning, additional, Fischer, Lukas, additional, Frege, Carla, additional, Fuchs, Claudia, additional, Garmash, Olga, additional, Gordon, Hamish, additional, Hakala, Jani, additional, He, Xucheng, additional, Heikkinen, Liine, additional, Heinritzi, Martin, additional, Helm, Johanna C., additional, Hofbauer, Victoria, additional, Hoyle, Christopher R., additional, Jokinen, Tuija, additional, Kangasluoma, Juha, additional, Kerminen, Veli-Matti, additional, Kim, Changhyuk, additional, Kirkby, Jasper, additional, Kontkanen, Jenni, additional, Kürten, Andreas, additional, Lawler, Michael J., additional, Mai, Huajun, additional, Mathot, Serge, additional, Mauldin, Roy L., additional, Molteni, Ugo, additional, Nichman, Leonid, additional, Nie, Wei, additional, Nieminen, Tuomo, additional, Ojdanic, Andrea, additional, Onnela, Antti, additional, Passananti, Monica, additional, Petäjä, Tuukka, additional, Piel, Felix, additional, Pospisilova, Veronika, additional, Quéléver, Lauriane L. J., additional, Rissanen, Matti P., additional, Rose, Clémence, additional, Sarnela, Nina, additional, Schallhart, Simon, additional, Schuchmann, Simone, additional, Sengupta, Kamalika, additional, Simon, Mario, additional, Sipilä, Mikko, additional, Tauber, Christian, additional, Tomé, António, additional, Tröstl, Jasmin, additional, Väisänen, Olli, additional, Vogel, Alexander L., additional, Volkamer, Rainer, additional, Wagner, Andrea C., additional, Wang, Mingyi, additional, Weitz, Lena, additional, Wimmer, Daniela, additional, Ye, Penglin, additional, Ylisirniö, Arttu, additional, Zha, Qiaozhi, additional, Carslaw, Kenneth S., additional, Curtius, Joachim, additional, Donahue, Neil M., additional, Flagan, Richard C., additional, Hansel, Armin, additional, Riipinen, Ilona, additional, Virtanen, Annele, additional, Winkler, Paul M., additional, Baltensperger, Urs, additional, Kulmala, Markku, additional, and Worsnop, Douglas R., additional

Published
2018
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33. Multicomponent new particle formation from sulfuric acid, ammonia, and biogenic vapors

Author

Lehtipalo, Katrianne, Yan, Chao, Dada, Lubna, Bianchi, Federico, Xiao, Mao, Wagner, Robert, Stolzenburg, Dominik, Ahonen, Lauri R., Amorim, Antonio, Baccarini, Andrea, Bauer, Paulus S., Baumgartner, Bernhard, Bergen, Anton, Bernhammer, Anne-Kathrin, Breitenlechner, Martin, Brilke, Sophia, Buchholz, Angela, Mazon, Stephany Buenrostro, Chen, Dexian, Chen, Xuemeng, Dias, Antonio, Dommen, Josef, Draper, Danielle C., Duplissy, Jonathan, Ehn, Mikael, Finkenzeller, Henning, Fischer, Lukas, Frege, Carla, Fuchs, Claudia, Garmash, Olga, Gordon, Hamish, Hakala, Jani, He, Xucheng, Heikkinen, Liine, Heinritzi, Martin, Helm, Johanna C., Hofbauer, Victoria, Hoyle, Christopher R., Jokinen, Tuija, Kangasluoma, Juha, Kerminen, Veli-Matti, Kim, Changhyuk, Kirkby, Jasper, Kontkanen, Jenni, Kuerten, Andreas, Lawler, Michael J., Mai, Huajun, Mathot, Serge, Mauldin, Roy L., Molteni, Ugo, Nichman, Leonid, Nie, Wei, Nieminen, Tuomo, Ojdanic, Andrea, Onnela, Antti, Passananti, Monica, Petaja, Tuukka, Piel, Felix, Pospisilova, Veronika, Quelever, Lauriane L. J., Rissanen, Matti P., Rose, Clemence, Sarnela, Nina, Schallhart, Simon, Schuchmann, Simone, Sengupta, Kamalika, Simon, Mario, Sipila, Mikko, Tauber, Christian, Tome, Antonio, Trostl, Jasmin, Vaisanen, Olli, Vogel, Alexander L., Volkamer, Rainer, Wagner, Andrea C., Wang, Mingyi, Weitz, Lena, Wimmer, Daniela, Ye, Penglin, Ylisirnio, Arttu, Zha, Qiaozhi, Carslaw, Kenneth S., Curtius, Joachim, Donahue, Neil M., Flagan, Richard C., Hansel, Armin, Riipinen, Ilona, Virtanen, Annele, Winkler, Paul M., Baltensperger, Urs, Kulmala, Markku, Worsnop, Douglas R., Lehtipalo, Katrianne, Yan, Chao, Dada, Lubna, Bianchi, Federico, Xiao, Mao, Wagner, Robert, Stolzenburg, Dominik, Ahonen, Lauri R., Amorim, Antonio, Baccarini, Andrea, Bauer, Paulus S., Baumgartner, Bernhard, Bergen, Anton, Bernhammer, Anne-Kathrin, Breitenlechner, Martin, Brilke, Sophia, Buchholz, Angela, Mazon, Stephany Buenrostro, Chen, Dexian, Chen, Xuemeng, Dias, Antonio, Dommen, Josef, Draper, Danielle C., Duplissy, Jonathan, Ehn, Mikael, Finkenzeller, Henning, Fischer, Lukas, Frege, Carla, Fuchs, Claudia, Garmash, Olga, Gordon, Hamish, Hakala, Jani, He, Xucheng, Heikkinen, Liine, Heinritzi, Martin, Helm, Johanna C., Hofbauer, Victoria, Hoyle, Christopher R., Jokinen, Tuija, Kangasluoma, Juha, Kerminen, Veli-Matti, Kim, Changhyuk, Kirkby, Jasper, Kontkanen, Jenni, Kuerten, Andreas, Lawler, Michael J., Mai, Huajun, Mathot, Serge, Mauldin, Roy L., Molteni, Ugo, Nichman, Leonid, Nie, Wei, Nieminen, Tuomo, Ojdanic, Andrea, Onnela, Antti, Passananti, Monica, Petaja, Tuukka, Piel, Felix, Pospisilova, Veronika, Quelever, Lauriane L. J., Rissanen, Matti P., Rose, Clemence, Sarnela, Nina, Schallhart, Simon, Schuchmann, Simone, Sengupta, Kamalika, Simon, Mario, Sipila, Mikko, Tauber, Christian, Tome, Antonio, Trostl, Jasmin, Vaisanen, Olli, Vogel, Alexander L., Volkamer, Rainer, Wagner, Andrea C., Wang, Mingyi, Weitz, Lena, Wimmer, Daniela, Ye, Penglin, Ylisirnio, Arttu, Zha, Qiaozhi, Carslaw, Kenneth S., Curtius, Joachim, Donahue, Neil M., Flagan, Richard C., Hansel, Armin, Riipinen, Ilona, Virtanen, Annele, Winkler, Paul M., Baltensperger, Urs, Kulmala, Markku, and Worsnop, Douglas R.

Abstract

A major fraction of atmospheric aerosol particles, which affect both air quality and climate, form from gaseous precursors in the atmosphere. Highly oxygenated organic molecules (HOMs), formed by oxidation of biogenic volatile organic compounds, are known to participate in particle formation and growth. However, it is not well understood how they interact with atmospheric pollutants, such as nitrogen oxides (NOx) and sulfur oxides (SOx) from fossil fuel combustion, as well as ammonia (NH3) from livestock and fertilizers. Here, we show how NOx suppresses particle formation, while HOMs, sulfuric acid, and NH3 have a synergistic enhancing effect on particle formation. We postulate a novel mechanism, involving HOMs, sulfuric acid, and ammonia, which is able to closely reproduce observations of particle formation and growth in daytime boreal forest and similar environments. The findings elucidate the complex interactions between biogenic and anthropogenic vapors in the atmospheric aerosol system.

Published
2018
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34. Ambient Measurements of Highly Oxidized Gas-Phase Molecules during the Southern Oxidant and Aerosol Study (SOAS) 2013

Author

Massoli, Paola, primary, Stark, Harald, additional, Canagaratna, Manjula R., additional, Krechmer, Jordan E., additional, Xu, Lu, additional, Ng, Nga L., additional, Mauldin, Roy L., additional, Yan, Chao, additional, Kimmel, Joel, additional, Misztal, Pawel K., additional, Jimenez, Jose L., additional, Jayne, John T., additional, and Worsnop, Douglas R., additional

Published
2018
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35. Sources and Characteristics of Summertime Organic Aerosol in the Colorado Front Range: Perspective from Measurements and WRF-Chem Modeling

Author

Bahreini, Roya, primary, Ahmadov, Ravan, additional, McKeen, Stu A., additional, Vu, Kennedy T., additional, Dingle, Justin H., additional, Apel, Eric C., additional, Blake, Donald R., additional, Blake, Nicola, additional, Campos, Teresa L., additional, Cantrell, Chris, additional, Flocke, Frank, additional, Fried, Alan, additional, Gillman, Jessica B., additional, Hills, Alan J., additional, Hornbrook, Rebecca S., additional, Huey, Greg, additional, Kaser, Lisa, additional, Lerner, Brian M., additional, Mauldin, Roy L., additional, Meinardi, Simone, additional, Montzka, Denise D., additional, Richter, Dirk, additional, Schroeder, Jason R., additional, Stell, Meghan, additional, Tanner, David, additional, Walgea, James, additional, Weibring, Peter, additional, and Weinheimer, Andrew, additional

Published
2018
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36. Supplementary material to "Sources and Characteristics of Summertime Organic Aerosol in the Colorado Front Range: Perspective from Measurements and WRF-Chem Modeling"

Author

Bahreini, Roya, primary, Ahmadov, Ravan, additional, McKeen, Stu A., additional, Vu, Kennedy T., additional, Dingle, Justin H., additional, Apel, Eric C., additional, Blake, Donald R., additional, Blake, Nicola, additional, Campos, Teresa L., additional, Cantrell, Chris, additional, Flocke, Frank, additional, Fried, Alan, additional, Gillman, Jessica B., additional, Hills, Alan J., additional, Hornbrook, Rebecca S., additional, Huey, Greg, additional, Kaser, Lisa, additional, Lerner, Brian M., additional, Mauldin, Roy L., additional, Meinardi, Simone, additional, Montzka, Denise D., additional, Richter, Dirk, additional, Schroeder, Jason R., additional, Stell, Meghan, additional, Tanner, David, additional, Walgea, James, additional, Weibring, Peter, additional, and Weinheimer, Andrew, additional

Published
2018
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37. The role of ions in new particle formation in the CLOUD chamber

Author

Wagner, Robert, Yan, Chao, Lehtipalo, Katrianne, Duplissy, Jonathan, Nieminen, Tuomo, Kangasluoma, Juha, Ahonen, Lauri R., Dada, Lubna, Kontkanen, Jenni, Manninen, Hanna E., Dias, Antonio, Amorim, Antonio, Bauer, Paulus S., Bergen, Anton, Bernhammer, Anne-Kathrin, Bianchi, Federico, Brilke, Sophia, Mazon, Stephany Buenrostro, Chen, Xuemeng, Draper, Danielle C., Fischer, Lukas, Frege, Carla, Fuchs, Claudia, Garmash, Olga, Gordon, Hamish, Hakala, Jani, Heikkinen, Liine, Heinritzi, Martin, Hofbauer, Victoria, Hoyle, Christopher R., Kirkby, Jasper, Kürten, Andreas, Kvashnin, Alexander N., Laurila, Tiia, Lawler, Michael J., Mai, Huajun, Makhmutov, Vladimir, Mauldin, Roy L., Molteni, Ugo, Nichman, Leonid, Nie, Wei, Ojdanic, Andrea, Onnela, Antti, Piel, Felix, Quéléver, Lauriane L. J., Rissanen, Matti P., Sarnela, Nina, Schallhart, Simon, Sengupta, Kamalika, Simon, Mario, Stolzenburg, Dominik, Stozhkov, Yuri, Tröstl, Jasmin, Viisanen, Yrjo, Vogel, Alexander L., Wagner, Andrea C., Xiao, Mao, Ye, Penglin, Baltensperger, Urs, Curtius, Joachim, Donahue, Neil M., Flagan, Richard C., Gallagher, Martin, Hansel, Armin, Smith, James N., Tomé, António, Winkler, Paul M., Worsnop, Douglas, Ehn, Mikael, Sipilä, Mikko, Kerminen, Veli-Matti, Petäjä, Tuukka, Kulmala, Markku, Wagner, Robert, Yan, Chao, Lehtipalo, Katrianne, Duplissy, Jonathan, Nieminen, Tuomo, Kangasluoma, Juha, Ahonen, Lauri R., Dada, Lubna, Kontkanen, Jenni, Manninen, Hanna E., Dias, Antonio, Amorim, Antonio, Bauer, Paulus S., Bergen, Anton, Bernhammer, Anne-Kathrin, Bianchi, Federico, Brilke, Sophia, Mazon, Stephany Buenrostro, Chen, Xuemeng, Draper, Danielle C., Fischer, Lukas, Frege, Carla, Fuchs, Claudia, Garmash, Olga, Gordon, Hamish, Hakala, Jani, Heikkinen, Liine, Heinritzi, Martin, Hofbauer, Victoria, Hoyle, Christopher R., Kirkby, Jasper, Kürten, Andreas, Kvashnin, Alexander N., Laurila, Tiia, Lawler, Michael J., Mai, Huajun, Makhmutov, Vladimir, Mauldin, Roy L., Molteni, Ugo, Nichman, Leonid, Nie, Wei, Ojdanic, Andrea, Onnela, Antti, Piel, Felix, Quéléver, Lauriane L. J., Rissanen, Matti P., Sarnela, Nina, Schallhart, Simon, Sengupta, Kamalika, Simon, Mario, Stolzenburg, Dominik, Stozhkov, Yuri, Tröstl, Jasmin, Viisanen, Yrjo, Vogel, Alexander L., Wagner, Andrea C., Xiao, Mao, Ye, Penglin, Baltensperger, Urs, Curtius, Joachim, Donahue, Neil M., Flagan, Richard C., Gallagher, Martin, Hansel, Armin, Smith, James N., Tomé, António, Winkler, Paul M., Worsnop, Douglas, Ehn, Mikael, Sipilä, Mikko, Kerminen, Veli-Matti, Petäjä, Tuukka, and Kulmala, Markku

Abstract

The formation of secondary particles in the atmosphere accounts for more than half of global cloud condensation nuclei. Experiments at the CERN CLOUD (Cosmics Leaving OUtdoor Droplets) chamber have underlined the importance of ions for new particle formation, but quantifying their effect in the atmosphere remains challenging. By using a novel instrument setup consisting of two nanoparticle counters, one of them equipped with an ion filter, we were able to further investigate the ion-related mechanisms of new particle formation. In autumn 2015, we carried out experiments at CLOUD on four systems of different chemical compositions involving monoterpenes, sulfuric acid, nitrogen oxides, and ammonia. We measured the influence of ions on the nucleation rates under precisely controlled and atmospherically relevant conditions. Our results indicate that ions enhance the nucleation process when the charge is necessary to stabilize newly formed clusters, i.e., in conditions in which neutral clusters are unstable. For charged clusters that were formed by ion-induced nucleation, we were able to measure, for the first time, their progressive neutralization due to recombination with oppositely charged ions. A large fraction of the clusters carried a charge at 1.5 nm diameter. However, depending on particle growth rates and ion concentrations, charged clusters were largely neutralized by ion-ion recombination before they grew to 2.5 nm. At this size, more than 90% of particles were neutral. In other words, particles may originate from ion-induced nucleation, although they are neutral upon detection at diameters larger than 2.5 nm. Observations at Hyytiala, Finland, showed lower ion concentrations and a lower contribution of ion-induced nucleation than measured at CLOUD under similar conditions. Although this can be partly explained by the observation that ion-induced fractions decrease towards lower ion concentrations, further investigations are needed to resolve the origin of the

Published
2017
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39. Ambient observations of dimers from terpene oxidation in the gas phase: Implications for new particle formation and growth

Author

Mohr, Claudia, primary, Lopez‐Hilfiker, Felipe D., additional, Yli‐Juuti, Taina, additional, Heitto, Arto, additional, Lutz, Anna, additional, Hallquist, Mattias, additional, D'Ambro, Emma L., additional, Rissanen, Matti P., additional, Hao, Liqing, additional, Schobesberger, Siegfried, additional, Kulmala, Markku, additional, Mauldin, Roy L., additional, Makkonen, Ulla, additional, Sipilä, Mikko, additional, Petäjä, Tuukka, additional, and Thornton, Joel A., additional

Published
2017
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40. Arctic springtime observations of volatile organic compounds during the OASIS‐2009 campaign

Author

Hornbrook, Rebecca S., primary, Hills, Alan J., additional, Riemer, Daniel D., additional, Abdelhamid, Aroob, additional, Flocke, Frank M., additional, Hall, Samuel R., additional, Huey, L. Gregory, additional, Knapp, David J., additional, Liao, Jin, additional, Mauldin, Roy L., additional, Montzka, Denise D., additional, Orlando, John J., additional, Shepson, Paul B., additional, Sive, Barkley, additional, Staebler, Ralf M., additional, Tanner, David. J., additional, Thompson, Chelsea R., additional, Turnipseed, Andrew, additional, Ullmann, Kirk, additional, Weinheimer, Andrew J., additional, and Apel, Eric C., additional

Published
2016
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42. Formation of Low Volatility Organic Compounds and Secondary Organic Aerosol from Isoprene Hydroxyhydroperoxide Low-NO Oxidation

Author

Krechmer, Jordan E., primary, Coggon, Matthew M., additional, Massoli, Paola, additional, Nguyen, Tran B., additional, Crounse, John D., additional, Hu, Weiwei, additional, Day, Douglas A., additional, Tyndall, Geoffrey S., additional, Henze, Daven K., additional, Rivera-Rios, Jean C., additional, Nowak, John B., additional, Kimmel, Joel R., additional, Mauldin, Roy L., additional, Stark, Harald, additional, Jayne, John T., additional, Sipilä, Mikko, additional, Junninen, Heikki, additional, St. Clair, Jason M., additional, Zhang, Xuan, additional, Feiner, Philip A., additional, Zhang, Li, additional, Miller, David O., additional, Brune, William H., additional, Keutsch, Frank N., additional, Wennberg, Paul O., additional, Seinfeld, John H., additional, Worsnop, Douglas R., additional, Jimenez, Jose L., additional, and Canagaratna, Manjula R., additional

Published
2015
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44. Evolution of NOx in the Denver Urban Plume during the Front Range Air Pollution and Photochemistry Experiment.

Author

Ebben, Carlena J., Sparks, Tamara L., Wooldridge, Paul J., Campos, Teresa L., Cantrell, Christopher A., Mauldin, Roy L., Weinheimer, Andrew J., and Cohen, Ronald C.

Abstract

As NOx (NOx ≡ NO + NO2) is transported away from cities, it undergoes photochemical oxidation to peroxynitrates (RO2NO2, ΣPNs), alkyl nitrates (RONO2, ΣANs), and nitric acid (HNO3). These higher oxide species each have different lifetimes to permanent removal or conversion back to NOx, resulting in nitrogen oxide chemistry that evolves as plumes are transported away from cities. Here, observations from the Front Range Air Pollution and Photochemistry Experiment (FRAPPÉ) are used to describe the evolution of NOx and NOy (NOy ≡ NOx + ΣPNs + ΣANs + HNO3 + …) as the Denver urban plume flows outward from the city center. We evaluate the chemistry, dilution, and deposition rates in the plume to provide numerical constraints on the NOx and NOy,i lifetimes. We find that plume dilution with background air occurs with a lifetime of 3.5 hours. NOx concentrations decrease more rapidly with a lifetime to chemical loss and dilution of 2 hours in the near field of the city center. NOy has an effective lifetime of 3 hours and due to a combination of HNO3 deposition and dilution. The results provide a useful test of conceptual and numerical models of chemistry during the evolution of urban plumes. [ABSTRACT FROM AUTHOR]

Published
2017
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45. High levels of molecular chlorine in the Arctic atmosphere

Author

Liao, Jin, primary, Huey, L. Gregory, additional, Liu, Zhen, additional, Tanner, David J., additional, Cantrell, Chris A., additional, Orlando, John J., additional, Flocke, Frank M., additional, Shepson, Paul B., additional, Weinheimer, Andrew J., additional, Hall, Samuel R., additional, Ullmann, Kirk, additional, Beine, Harry J., additional, Wang, Yuhang, additional, Ingall, Ellery D., additional, Stephens, Chelsea R., additional, Hornbrook, Rebecca S., additional, Apel, Eric C., additional, Riemer, Daniel, additional, Fried, Alan, additional, Mauldin, Roy L., additional, Smith, James N., additional, Staebler, Ralf M., additional, Neuman, J. Andrew, additional, and Nowak, John B., additional

Published
2014
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48. Indirect Measurements of the Composition of Ultrafine Particles in the Arctic Late‐Winter

Author

Myers, Deanna C., Lawler, Michael J., Mauldin, Roy L., Sjostedt, Steven, Dubey, Manvendra, Abbatt, Jonathan, and Smith, James N.

Abstract

We present indirect measurements of size‐resolved ultrafine particle composition conducted during the Ocean‐Atmosphere‐Sea Ice‐Snowpack (OASIS) Campaign in Utqiagvik, Alaska, during March 2009. This study focuses on measurements of size‐resolved particle hygroscopicity and volatility measured over two periods of the campaign. During a period that represents background conditions in this location, particle hygroscopic growth factors (HGF) at 90% relative humidity ranged from 1.45 to 1.51, which combined with volatility measurements suggest a mixture of ∼30% ammoniated sulfates and ∼70% oxidized organics. Two separate regional ultrafine particle growth events were also observed during this campaign. Event 1 coincided with elevated levels of H2SO4and solar radiation. These particles were highly hygroscopic (HGF= 2.1 for 35 nm particles), but were almost fully volatilized at 160 °C. The air masses associated with both events originated over the Arctic Ocean. Event 1 was influenced by the upper marine boundary layer (200–350 m AGL), while Event 2 spent more time closer to the surface (50–150 m AGL) and over open ocean leads, suggesting marine influence in growth processes. Event 2 particles were slightly less hygroscopic (HGF= 1.94 for 35 nm and 1.67 for 15 nm particles), and similarly volatile. We hypothesize that particles formed during both events contained 60–70% hygroscopic salts by volume, with the balance for Event 1 being sulfates and oxidized organics for Event 2. These observations suggest that primary sea spray may be an important initiator of ultrafine particle formation events in the Arctic late‐winter, but a variety of processes may be responsible for condensational growth. There are few measurements of ultrafine (sub‐100 nm) particle chemical composition in the Arctic, particularly during winter and early spring. This paper contains analysis of indirect measurements of ultrafine particle composition made in Utqiagvik, Alaska in March 2009. We focus on two periods during which local pollution was minimal to characterize both background and newly formed ultrafine particles. Our measurements suggest differences in composition between these two particle populations, indicating they likely formed from different sources. Analysis of the properties of the newly formed particles suggests that sea spray contributes to ultrafine particle formation in this region, which is unusual for the high Arctic during winter and spring, and that growth occurs from condensation of many different chemical species. Indirect measurements suggest that background ultrafine particles are composed of oxidized organic species and ammoniated sulfatesTwo ultrafine particle growth events were observed and were likely influenced by marine emissionsNewly formed particles were highly hygroscopic and relatively volatile, the latter property not consistent with primary sea salt aerosol Indirect measurements suggest that background ultrafine particles are composed of oxidized organic species and ammoniated sulfates Two ultrafine particle growth events were observed and were likely influenced by marine emissions Newly formed particles were highly hygroscopic and relatively volatile, the latter property not consistent with primary sea salt aerosol

Published
2021
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49. Chemical composition of nanoparticles from ��-pinene nucleation and the influence of isoprene and relative humidity at low temperature

Author

Caudillo, Luc��a, R��rup, Birte, Heinritzi, Martin, Marie, Guillaume, Simon, Mario, Wagner, Andrea C., M��ller, Tatjana, Granzin, Manuel, Amorim, Antonio, Ataei, Farnoush, Baalbaki, Rima, Bertozzi, Barbara, Brasseur, Zo��, Chiu, Randall, Chu, Biwu, Dada, Lubna, Duplissy, Jonathan, Finkenzeller, Henning, Gonzalez Carracedo, Lo��c, He, Xu-Cheng, Hofbauer, Victoria, Kong, Weimeng, Lamkaddam, Houssni, Lee, Chuan P., Lopez, Brandon, Mahfouz, Naser G. A., Makhmutov, Vladimir, Manninen, Hanna E., Marten, Ruby, Massab��, Dario, Mauldin, Roy L., Mentler, Bernhard, Molteni, Ugo, Onnela, Antti, Pfeifer, Joschka, Philippov, Maxim, Piedehierro, Ana A., Schervish, Meredith, Scholz, Wiebke, Schulze, Benjamin, Shen, Jiali, Stolzenburg, Dominik, Stozhkov, Yuri, Surdu, Mihnea, Tauber, Christian, Tham, Yee Jun, Tian, Ping, Tom��, Ant��nio, Vogt, Steffen, Wang, Mingyi, Wang, Dongyu S., Weber, Stefan K., Welti, Andr��, Yonghong, Wang, Yusheng, Wu, Zauner-Wieczorek, Marcel, Baltensperger, Urs, El Haddad, Imad, Flagan, Richard C., Hansel, Armin, H��hler, Kristina, Kirkby, Jasper, Kulmala, Markku, Lehtipalo, Katrianne, M��hler, Ottmar, Saathoff, Harald, Volkamer, Rainer, Winkler, Paul M., Donahue, Neil M., K��rten, Andreas, and Curtius, Joachim

Subjects
13. Climate action
Abstract

Biogenic organic precursors play an important role in atmospheric new particle formation (NPF). One of the major precursor species is ��-pinene, which upon oxidation can form a suite of products covering a wide range of volatilities. Highly oxygenated organic molecules (HOMs) comprise a fraction of the oxidation products formed. While it is known that HOMs contribute to secondary organic aerosol (SOA) formation, including NPF, they have not been well studied in newly formed particles due to their very low mass concentrations. Here we present gas- and particle-phase chemical composition data from experimental studies of ��-pinene oxidation, including in the presence of isoprene, at temperatures (���50 and ���30 ���C) and relative humidities (20 % and 60 %)relevant in the upper free troposphere. The measurements took place at the CERN Cosmics Leaving Outdoor Droplets (CLOUD) chamber. The particle chemical composition was analyzed by a thermal desorption differential mobility analyzer (TD-DMA) coupled to a nitrate chemical ionization���atmospheric pressure interface���time-of-flight (CI-APi-TOF) mass spectrometer. CI-APi-TOF was used for particle- and gas-phase measurements, applying the same ionization and detection scheme. Our measurements revealed the presence of C8���10 monomers and C18���20 dimers as the major compounds in the particles (diameter up to ���100 nm). Particularly, for the system with isoprene added, C5 (C5H10O5���7) and C15 compounds (C15H24O5���10) were detected. This observation is consistent with the previously observed formation of such compounds in the gas phase. However, although the C5 and C15 compounds do not easily nucleate, our measurements indicate that they can still contribute to the particle growth at free tropospheric conditions. For the experiments reported here, most likely isoprene oxidation products enhance the growth of particles larger than 15 nm. Additionally, we report on the nucleation rates measured at 1.7 nm (J1.7 nm) and compared with previous studies, we found lower J1.7 nm values, very likely due to the higher ��-pinene and ozone mixing ratios used in the present study.

50. The driving factors of new particle formation and growth in the polluted boundary layer

Author

Xiao, Mao, Hoyle, Christopher R., Dada, Lubna, Stolzenburg, Dominik, Kürten, Andreas, Wang, Mingyi, Lamkaddam, Houssni, Garmash, Olga, Mentler, Bernhard, Molteni, Ugo, Baccarini, Andrea, Simon, Mario, He, Xu-Cheng, Lehtipalo, Katrianne, Ahonen, Lauri R., Baalbaki, Rima, Bauer, Paulus S., Beck, Lisa, Bell, David, Bianchi, Federico, Brilke, Sophia, Chen, Dexian, Chiu, Randall, Dias, António, Duplissy, Jonathan, Finkenzeller, Henning, Gordon, Hamish, Hofbauer, Victoria, Kim, Changhyuk, Koenig, Theodore K., Lampilahti, Janne, Lee, Chuan Ping, Li, Zijun, Mai, Huajun, Makhmutov, Vladimir, Manninen, Hanna E., Marten, Ruby, Mathot, Serge, Mauldin, Roy L., Nie, Wei, Onnela, Antti, Partoll, Eva, Petäjä, Tuukka, Pfeifer, Joschka, Pospisilova, Veronika, Quéléver, Lauriane L.J., Rissanen, Matti P., Schobesberger, Siegfried, Schuchmann, Simone, Stozhkov, Yuri, Tauber, Christian, Tham, Yee Jun, Tomé, António, Vazquez-Pufleau, Miguel, Wagner, Andrea C., Wagner, Robert, Wang, Yonghong, Weitz, Lena, Wimmer, Daniela, Wu, Yusheng, Yan, Chao, Ye, Penglin, Ye, Qing, Zha, Qiaozhi, Zhou, Xueqin, Amorim, Antonio, Carslaw, Ken, Curtius, Joachim, Hansel, Armin, Volkamer, Rainer, Winkler, Paul M., Flagan, Richard C., Kulmala, Markku, Worsnop, Douglas R., Kirkby, Jasper, Donahue, Neil M., Baltensperger, Urs, El Haddad, Imad, and Dommen, Josef

Subjects
13. Climate action
Abstract

New particle formation (NPF) is a significant source of atmospheric particles, affecting climate and air quality. Understanding the mechanisms involved in urban aerosols is important to develop effective mitigation strategies. However, NPF rates reported in the polluted boundary layer span more than 4 orders of magnitude, and the reasons behind this variability are the subject of intense scientific debate. Multiple atmospheric vapours have been postulated to participate in NPF, including sulfuric acid, ammonia, amines and organics, but their relative roles remain unclear. We investigated NPF in the CLOUD chamber using mixtures of anthropogenic vapours that simulate polluted boundary layer conditions. We demonstrate that NPF in polluted environments is largely driven by the formation of sulfuric acid-base clusters, stabilized by the presence of amines, high ammonia concentrations and lower temperatures. Aromatic oxidation products, despite their extremely low volatility, play a minor role in NPF in the chosen urban environment but can be important for particle growth and hence for the survival of newly formed particles. Our measurements quantitatively account for NPF in highly diverse urban environments and explain its large observed variability. Such quantitative information obtained under controlled laboratory conditions will help the interpretation of future ambient observations of NPF rates in polluted atmospheres., Atmospheric Chemistry and Physics, 21 (18), ISSN:1680-7375, ISSN:1680-7367

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