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Your search keyword '"Quéléver, Lauriane L.J."' showing total 8 results
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8 results on '"Quéléver, Lauriane L.J."'

1. Modelling the coupled mercury-halogen-ozone cycle in the central Arctic during spring

Author

Université Grenoble Alpes, European Commission, Centre National de la Recherche Scientifique (France), National Science Foundation (US), Swiss National Science Foundation, Swiss Polar Institute, National Oceanic and Atmospheric Administration (US), Academy of Finland, Ferring Pharmaceuticals, Danish Environmental Protection Agency, Government of Canada, German Research Foundation, Ahmed, Shaddy, Thomas, Jennie L., Angot, Hélène, Dommergue, Aurélien, Archer, Stephen D., Bariteau, Ludovic, Beck, Ivo, Benavent, Nuria, Blechschmidt, Anne Marlene, Blomquist, Byron, Boyer, Matthew, Christensen, Jesper H., Dahlke, Sandro, Dastoor, Ashu, Helmig, Detlev, Howard, Dean, Jacobi, Hans Werner, Jokinen, Tuija, Lapere, Rémy, Laurila, Tiia, Quéléver, Lauriane L.J., Richter, Andreas, Ryjkov, Andrei, Mahajan, Anoop S., Marelle, Louis, Pfaffhuber, Katrine Aspmo, Posman, Kevin, Rinke, Annette, Saiz-Lopez, A., Schmale, Julia, Skov, Henrik, Steffen, Alexandra, Stupple, Geoff, Stutz, Jochen, Travnikov, Oleg, Zilker, Bianca, Université Grenoble Alpes, European Commission, Centre National de la Recherche Scientifique (France), National Science Foundation (US), Swiss National Science Foundation, Swiss Polar Institute, National Oceanic and Atmospheric Administration (US), Academy of Finland, Ferring Pharmaceuticals, Danish Environmental Protection Agency, Government of Canada, German Research Foundation, Ahmed, Shaddy, Thomas, Jennie L., Angot, Hélène, Dommergue, Aurélien, Archer, Stephen D., Bariteau, Ludovic, Beck, Ivo, Benavent, Nuria, Blechschmidt, Anne Marlene, Blomquist, Byron, Boyer, Matthew, Christensen, Jesper H., Dahlke, Sandro, Dastoor, Ashu, Helmig, Detlev, Howard, Dean, Jacobi, Hans Werner, Jokinen, Tuija, Lapere, Rémy, Laurila, Tiia, Quéléver, Lauriane L.J., Richter, Andreas, Ryjkov, Andrei, Mahajan, Anoop S., Marelle, Louis, Pfaffhuber, Katrine Aspmo, Posman, Kevin, Rinke, Annette, Saiz-Lopez, A., Schmale, Julia, Skov, Henrik, Steffen, Alexandra, Stupple, Geoff, Stutz, Jochen, Travnikov, Oleg, and Zilker, Bianca

Abstract

Near-surface mercury and ozone depletion events occur in the lowest part of the atmosphere during Arctic spring. Mercury depletion is the first step in a process that transforms long-lived elemental mercury to more reactive forms within the Arctic that are deposited to the cryosphere, ocean, and other surfaces, which can ultimately get integrated into the Arctic food web. Depletion of both mercury and ozone occur due to the presence of reactive halogen radicals that are released from snow, ice, and aerosols. In this work, we added a detailed description of the Arctic atmospheric mercury cycle to our recently published version of the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem 4.3.3) that includes Arctic bromine and chlorine chemistry and activation/recycling on snow and aerosols. The major advantage of our modelling approach is the online calculation of bromine concentrations and emission/recycling that is required to simulate the hourly and daily variability of Arctic mercury depletion. We used this model to study coupling between reactive cycling of mercury, ozone, and bromine during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) spring season in 2020 and evaluated results compared to land-based, ship-based, and remote sensing observations. The model predicts that elemental mercury oxidation is driven largely by bromine chemistry and that particulate mercury is the major form of oxidized mercury. The model predicts that the majority (74%) of oxidized mercury deposited to land-based snow is re-emitted to the atmosphere as gaseous elemental mercury, while a minor fraction (4%) of oxidized mercury that is deposited to sea ice is re-emitted during spring. Our work demonstrates that hourly differences in bromine/ozone chemistry in the atmosphere must be considered to capture the springtime Arctic mercury cycle, including its integration into the cryosphere and ocean.

Published
2023

2. A full year of aerosol size distribution data from the central Arctic under an extreme positive Arctic Oscillation: insights from the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition

Author

European Commission, Academy of Finland, Department of Energy (US), Swiss Polar Institute, Agencia Estatal de Investigación (España), Boyer, Matthew, Aliaga, Diego, Pernov, Jakob Boyd, Angot, Hélène, Quéléver, Lauriane L.J., Dada, Lubna, Heutte, Benjamin, Dall'Osto, Manuel, Beddows, David C. S., Brasseur, Zoé, Beck, Ivo, Bucci, Silvia, Duetsch, Marina, Stohl, Andreas, Laurila, Tiia, Asmi, Eija, Massling, Andreas, Thomas, Daniel Charles, Nøjgaard, Jacob Klenø, Chan, Tak, Sharma, Sangeeta, Tunved, Peter, Krejci, Radovan, Hansson, Hans-Christien, Bianchi, Federico, Lehtipalo, Katrianne, Wiedensohler, Alfred, Weinhold, Kay, Kulmala, Markku, Petäjä, Tuukka, Sipilä, Mikko, Schmale, Julia, Jokinen, Tuija, European Commission, Academy of Finland, Department of Energy (US), Swiss Polar Institute, Agencia Estatal de Investigación (España), Boyer, Matthew, Aliaga, Diego, Pernov, Jakob Boyd, Angot, Hélène, Quéléver, Lauriane L.J., Dada, Lubna, Heutte, Benjamin, Dall'Osto, Manuel, Beddows, David C. S., Brasseur, Zoé, Beck, Ivo, Bucci, Silvia, Duetsch, Marina, Stohl, Andreas, Laurila, Tiia, Asmi, Eija, Massling, Andreas, Thomas, Daniel Charles, Nøjgaard, Jacob Klenø, Chan, Tak, Sharma, Sangeeta, Tunved, Peter, Krejci, Radovan, Hansson, Hans-Christien, Bianchi, Federico, Lehtipalo, Katrianne, Wiedensohler, Alfred, Weinhold, Kay, Kulmala, Markku, Petäjä, Tuukka, Sipilä, Mikko, Schmale, Julia, and Jokinen, Tuija

Abstract

The Arctic environment is rapidly changing due to accelerated warming in the region. The warming trend is driving a decline in sea ice extent, which thereby enhances feedback loops in the surface energy budget in the Arctic. Arctic aerosols play an important role in the radiative balance and hence the climate response in the region, yet direct observations of aerosols over the Arctic Ocean are limited. In this study, we investigate the annual cycle in the aerosol particle number size distribution (PNSD), particle number concentration (PNC), and black carbon (BC) mass concentration in the central Arctic during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition. This is the first continuous, year-long data set of aerosol PNSD ever collected over the sea ice in the central Arctic Ocean. We use a k-means cluster analysis, FLEXPART simulations, and inverse modeling to evaluate seasonal patterns and the influence of different source regions on the Arctic aerosol population. Furthermore, we compare the aerosol observations to land-based sites across the Arctic, using both long-term measurements and observations during the year of the MOSAiC expedition (2019–2020), to investigate interannual variability and to give context to the aerosol characteristics from within the central Arctic. Our analysis identifies that, overall, the central Arctic exhibits typical seasonal patterns of aerosols, including anthropogenic influence from Arctic haze in winter and secondary aerosol processes in summer. The seasonal pattern corresponds to the global radiation, surface air temperature, and timing of sea ice melting/freezing, which drive changes in transport patterns and secondary aerosol processes. In winter, the Norilsk region in Russia/Siberia was the dominant source of Arctic haze signals in the PNSD and BC observations, which contributed to higher accumulation-mode PNC and BC mass concentrations in the central Arctic than at land-based obse

Published
2023

3. Substantial contribution of iodine to Arctic ozone destruction

Author

European Commission, Consejo Superior de Investigaciones Científicas (España), Academy of Finland, Ministry of Earth Sciences (India), Swiss National Science Foundation, Swiss Polar Institute, National Science Foundation (US), Ferring Pharmaceuticals, German Research Foundation, Mahajan, Anoop S. [0000-0002-2909-5432], Li, Qinyi [0000-0002-5146-5831], Cuevas, Carlos A. [0000-0002-9251-5460], Schmale, Julia [0000-0002-1048-7962], Angot, Hélène [0000-0003-4673-8249], Richter, Andreas [0000-0003-3339-212X], Fernandez, Rafael P. [0000-0002-4114-5500], Skov, Henrik [0000-0003-1167-8696], Bucci, Silvia [0000-0002-6251-9444], Duetsch, Marina [0000-0002-1128-4198], Stohl, Andreas [0000-0002-2524-5755], Archer, Stephen D. [0000-0001-6054-2424], Dada, Lubna [0000-0003-1105-9043], Daellenbach, Kaspar R. [0000-0003-1246-6396], Saiz-Lopez, A. [0000-0002-0060-1581], Benavent, Nuria, Mahajan, Anoop S., Li, Qinyi, Cuevas, Carlos A., Schmale, Julia, Angot, Hélène, Jokinen, Tuija, Quéléver, Lauriane L.J., Blechschmidt, Anne Marlene, Zilker, Bianca, Richter, Andreas, Serna, Jesús A., García-Nieto, D., Fernández, Rafael P., Skov, Henrik, Dumitrascu, Adela, Simões Pereira, Patric, Abrahamsson, Katarina, Bucci, Silvia, Duetsch, Marina, Stohl, Andreas, Beck, Ivo, Laurila, Tiia, Blomquist, Byron, Howard, Dean, Archer, Stephen D., Bariteau, Ludovic, Helmig, Detlev, Hueber, Jacques, Jacobi, Hans Werner, Posman, Kevin, Dada, Lubna, Daellenbach, Kaspar R., Saiz-Lopez, A., European Commission, Consejo Superior de Investigaciones Científicas (España), Academy of Finland, Ministry of Earth Sciences (India), Swiss National Science Foundation, Swiss Polar Institute, National Science Foundation (US), Ferring Pharmaceuticals, German Research Foundation, Mahajan, Anoop S. [0000-0002-2909-5432], Li, Qinyi [0000-0002-5146-5831], Cuevas, Carlos A. [0000-0002-9251-5460], Schmale, Julia [0000-0002-1048-7962], Angot, Hélène [0000-0003-4673-8249], Richter, Andreas [0000-0003-3339-212X], Fernandez, Rafael P. [0000-0002-4114-5500], Skov, Henrik [0000-0003-1167-8696], Bucci, Silvia [0000-0002-6251-9444], Duetsch, Marina [0000-0002-1128-4198], Stohl, Andreas [0000-0002-2524-5755], Archer, Stephen D. [0000-0001-6054-2424], Dada, Lubna [0000-0003-1105-9043], Daellenbach, Kaspar R. [0000-0003-1246-6396], Saiz-Lopez, A. [0000-0002-0060-1581], Benavent, Nuria, Mahajan, Anoop S., Li, Qinyi, Cuevas, Carlos A., Schmale, Julia, Angot, Hélène, Jokinen, Tuija, Quéléver, Lauriane L.J., Blechschmidt, Anne Marlene, Zilker, Bianca, Richter, Andreas, Serna, Jesús A., García-Nieto, D., Fernández, Rafael P., Skov, Henrik, Dumitrascu, Adela, Simões Pereira, Patric, Abrahamsson, Katarina, Bucci, Silvia, Duetsch, Marina, Stohl, Andreas, Beck, Ivo, Laurila, Tiia, Blomquist, Byron, Howard, Dean, Archer, Stephen D., Bariteau, Ludovic, Helmig, Detlev, Hueber, Jacques, Jacobi, Hans Werner, Posman, Kevin, Dada, Lubna, Daellenbach, Kaspar R., and Saiz-Lopez, A.

Abstract

Unlike bromine, the effect of iodine chemistry on the Arctic surface ozone budget is poorly constrained. We present ship-based measurements of halogen oxides in the high Arctic boundary layer from the sunlit period of March to October 2020 and show that iodine enhances springtime tropospheric ozone depletion. We find that chemical reactions between iodine and ozone are the second highest contributor to ozone loss over the study period, after ozone photolysis-initiated loss and ahead of bromine.

Published
2022

4. Observations of New Particle Formation events during summertime in Helsinki

Author

Thakur, Roseline, primary, Dada, Lubna, additional, Beck, Lisa, additional, Chan, Tommy, additional, Sulo, Juha, additional, Marbouti, Marjan, additional, He, Xu-Cheng, additional, Lampilahti, Janne, additional, Lampimäki, Markus, additional, Quéléver, Lauriane L.J, additional, Tham, Yee Jun, additional, Sarnela, Nina, additional, Lehtipalo, Katrianne, additional, Kulmala, Markku, additional, Sipilä, Mikko, additional, and Jokinen, Tuija, additional

Published
2021
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5. 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, Buenrostro Mazon, Stephany, Chen, Dexian, Chen, Xuemeng, Dias, António, 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, Kürten, Andreas, Lawler, Michael J., Mai, Huajun, Mathot, Serge, Mauldin III, Roy L., Molteni, Ugo, Nichman, Leonid, Nie, Wei, Nieminen, Tuomo, Ojdanic, Andrea, Onnela, Antti, Passananti, Monica, Petäjä, Tuukka, Piel, Felix, Pospisilova, Veronika, Quéléver, Lauriane L.J., Rissanen, Matti P., Rose, Clémence, Sarnela, Nina, Schallhart, Simon, Schuchmann, Simone, Sengupta, Kamalika, Simon, Mario, Sipilä, Mikko, Tauber, Christian, Tomé, António, Tröstl, Jasmin, Väisänen, Olli, Vogel, Alexander L., Volkamer, Rainer, Wagner, Andrea C., Wang, Mingyi, Weitz, Lena, Wimmer, Daniela, Ye, Penglin, Ylisirniö, Arttu, 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.

Subjects
inorganic chemicals
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., Science Advances, 4 (12), ISSN:2375-2548

Published
2018

6. Validity and limitations of simple reaction kinetics to calculate concentrations of organic compounds from ion counts in PTR-MS

Author

Holzinger, Rupert, Acton, W. Joe F., Bloss, William J., Breitenlechner, Martin, Crilley, Leigh R., Dusanter, Sébastien, Gonin, Marc, Gros, Valerie, Keutsch, Frank N., Kiendler-Scharr, Astrid, Kramer, Louisa J., Krechmer, Jordan E., Languille, Baptiste, Locoge, Nadine, Lopez-Hilfiker, Felipe, Materić, Dušan, Moreno, Sergi, Nemitz, Eiko, Quéléver, Lauriane L.J., Sarda Esteve, Roland, Sauvage, Stéphane, Schallhart, Simon, Sommariva, Roberto, Tillmann, Ralf, Wedel, Sergej, Worton, David R., Xu, Kangming, Zaytsev, Alexander, Holzinger, Rupert, Acton, W. Joe F., Bloss, William J., Breitenlechner, Martin, Crilley, Leigh R., Dusanter, Sébastien, Gonin, Marc, Gros, Valerie, Keutsch, Frank N., Kiendler-Scharr, Astrid, Kramer, Louisa J., Krechmer, Jordan E., Languille, Baptiste, Locoge, Nadine, Lopez-Hilfiker, Felipe, Materić, Dušan, Moreno, Sergi, Nemitz, Eiko, Quéléver, Lauriane L.J., Sarda Esteve, Roland, Sauvage, Stéphane, Schallhart, Simon, Sommariva, Roberto, Tillmann, Ralf, Wedel, Sergej, Worton, David R., Xu, Kangming, and Zaytsev, Alexander

Abstract

In September 2017, we conducted a proton-transfer-reaction mass-spectrometry (PTR-MS) intercomparison campaign at the CESAR observatory, a rural site in the central Netherlands near the village of Cabauw. Nine research groups deployed a total of 11 instruments covering a wide range of instrument types and performance. We applied a new calibration method based on fast injection of a gas standard through a sample loop. This approach allows calibrations on timescales of seconds, and within a few minutes an automated sequence can be run allowing one to retrieve diagnostic parameters that indicate the performance status. We developed a method to retrieve the mass-dependent transmission from the fast calibrations, which is an essential characteristic of PTR-MS instruments, limiting the potential to calculate concentrations based on counting statistics and simple reaction kinetics in the reactor/drift tube. Our measurements show that PTR-MS instruments follow the simple reaction kinetics if operated in the standard range for pressures and temperature of the reaction chamber (i.e. 1–4 mbar, 30–120∘, respectively), as well as a reduced field strength E∕N in the range of 100–160 Td. If artefacts can be ruled out, it becomes possible to quantify the signals of uncalibrated organics with accuracies better than ±30 %. The simple reaction kinetics approach produces less accurate results at E∕N levels below 100 Td, because significant fractions of primary ions form water hydronium clusters. Deprotonation through reactive collisions of protonated organics with water molecules needs to be considered when the collision energy is a substantial fraction of the exoergicity of the proton transfer reaction and/or if protonated organics undergo many collisions with water molecules.

Published
2019

7. Impact of warm air mass intrusions on atmospheric chemistry and microphysics

Author

Dada, Lubna, Beck, Ivo Fabio, Quéléver, Lauriane L.J., Baccarini, Andrea, Angot, Hélène, Laurila, Tiia, Lampimaki, Markus, Lamplahti, Janne, Chan, Tommy, Brasseur, Zoe, Boyer, Matt, Daellenbach, Kaspar R., Jokinen, Tuija, and Schmale, Julia

Subjects
Mosaic
Abstract

Arctic winter is dominated by anthropogenic haze, while pollution transport from mid-latitudes decreases in summertime. As a result, aerosol concentrations reach a maximum in winter and drop to minimum in summer. What happens during the season transition, i.e., during spring, is less studied owing to the difficulty of performing measurements in the high Arctic at this time of year. Warm air mass intrusions are characteristic for springtime and they are harbingers of change, from a dry stable atmosphere to a more dynamic one with precipitation. Such air mass intrusions have been studied from a meteorological and thermodynamic perspective but not yet in full detail from a chemical one. Here, we present first results on microphysical and chemical properties of the Arctic air from observations of warm air mass intrusions during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition in April 2020. A full suite of state-of-the-art instrumentation (trace gases concentration, aerosol number size distribution, aerosol mass composition, cloud condensation nuclei) was deployed on the bow of the research vessel Polarstern as part of the MOSAiC expedition for a comprehensive characterization of the chemical and microphysical state of the Arctic atmosphere. In this study, we aim to disentangle the effects of warm air mass intrusions on trace gases concentration as well as on aerosol number, mass and composition. During the first major intrusion episode (April 15 to 16, 2020), ambient temperature increased from -30 oC to roughly 0 oC within 48 hours. The relatively ‘cold’ period in early April was characterized by stagnant northerly winds, hence aged and dry Arctic air masses, where a very stable accumulation mode composed of sulfate and organics with traces of halogens was measured. With the arrival of southerly air masses, the particle number size distribution started featuring several modes and increased concentrations as well as particle growth. Moreover, the trace gas and particle chemical composition significantly changed, featuring methane sulfonic acid in the gas phase and ammonium in the particle phase. Warm air intrusions were also systematically associated with regular ozone levels (non-depleted) which is in line with the absence of halogen signature in particles.

8. 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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