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1. Impact of the 2021 La Palma volcanic eruption on air quality: Insights from a multidisciplinary approach

Author

Milford, Celia, Torres, Carlos, Vilches, Jon, Gossman, Ann-Kathrin, Weis, Frederik, Suárez-Molina, David, García, Omaira E., Prats, Natalia, Barreto, África, García, Rosa D., Bustos, Juan J., Marrero, Carlos L., Ramos, Ramón, Chinea, Nayra, Boulesteix, Thomas, Taquet, Noémie, Rodríguez, Sergio, López-Darias, Jessica, Sicard, Michaël, Córdoba-Jabonero, Carmen, and Cuevas, Emilio

Published
2023
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2. The use of δ13C in CO to determine removal of CH4 by Cl radicals in the atmosphere

Author

Roeckmann, Thomas, primary, van Herpen, Maarten M.J.W., additional, Brashear, Chloe, additional, Van der Veen, Carina, additional, Gromov, Sergey, additional, Li, Qinyi, additional, Saiz-Lopez, Alfonso, additional, Meidan, Daphne, additional, Barreto, Africa, additional, Prats, Natalia, additional, Marmol, Ignacio, additional, Ramos, Ramon, additional, Banos, Isabel, additional, Arrieta, Jesus M., additional, Zaehle, Sonke, additional, Jordan, Armin, additional, Moossen, Heiko, additional, Timas, Helder, additional, Young, Dickon, additional, Sperlich, Peter, additional, Moss, Rowena, additional, and Johnson, Matthew, additional

Published
2024
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5. La erupción volcánica de La Palma y el papel de la Agencia Estatal de Meteorología

Author

García, Omaira, Suárez, David, Cuevas, Emilio, Ramos, Ramón, Barreto, Africa, Hernández, Miguel, Quintero, Víctor, Toledano, Carlos, Sicard, Michaël, Córdoba-Jabonero, Carmen, Riz, Vicenzo, Roininen, Reijo, López, César, Vilches, Jon, Weiss, Maximilian, Carreño, Virgilio, Taquet, Noemie, Boulesteix, Thomas, Fraile-Nuez, Eugenio, Torres, Carlos F., Prats, Natalia, Alcántara, Antonio, León, Sergio, Rivas, Pedro, Álvarez, Óscar, Parra, Francisco, de Luis, Javier, González, César, Armas, Cristina, Romero, Pedro, de Bustos, Juan, Redondas, Alberto, Marrero, Carlos, Milford, Celia, Román, Roberto, González, Ramiro, López-Cayuela, María, Carvajal-Pérez, Clara, Chinea, Nayra, García, Rosa, Almansa, Fernando, González, Yenny, Bullón, Fernando, Poggio, Marta, Rivera, Clemente, Bayo, Concepción, Rey, Fernando, García, Omaira, Suárez, David, Cuevas, Emilio, Ramos, Ramón, Barreto, Africa, Hernández, Miguel, Quintero, Víctor, Toledano, Carlos, Sicard, Michaël, Córdoba-Jabonero, Carmen, Riz, Vicenzo, Roininen, Reijo, López, César, Vilches, Jon, Weiss, Maximilian, Carreño, Virgilio, Taquet, Noemie, Boulesteix, Thomas, Fraile-Nuez, Eugenio, Torres, Carlos F., Prats, Natalia, Alcántara, Antonio, León, Sergio, Rivas, Pedro, Álvarez, Óscar, Parra, Francisco, de Luis, Javier, González, César, Armas, Cristina, Romero, Pedro, de Bustos, Juan, Redondas, Alberto, Marrero, Carlos, Milford, Celia, Román, Roberto, González, Ramiro, López-Cayuela, María, Carvajal-Pérez, Clara, Chinea, Nayra, García, Rosa, Almansa, Fernando, González, Yenny, Bullón, Fernando, Poggio, Marta, Rivera, Clemente, Bayo, Concepción, and Rey, Fernando

Abstract

Durante la erupción del volcán de Cumbre Vieja, en la isla de La Palma en 2021, la Agencia Estatal de Meteorología (AEMET), en calidad de Servicio Nacional y Autoridad Meteorológica del Estado, prestó diferentes servicios de apoyo al Comité Científico y al Comité Asesor del Plan de Emergencias Volcánicas de Canarias (PEVOLCA). Parte de sus actividades abarcaron la vigilancia y predicción meteorológica, la monitorización y predicción del transporte del penacho volcánico, y la valoración del impacto de las emisiones de gases y cenizas de la erupción volcánica en la calidad del aire en la isla de La Palma y en la región de Canarias.

Published
2022

6. Volcanic Eruption of Cumbre Vieja, La Palma, Spain: A First Insight to the Particulate Matter Injected in the Troposphere

Author

Ministerio de Ciencia e Innovación (España), European Commission, Junta de Castilla y León, Agencia Estatal de Investigación (España), Sicard, Michaël, Córdoba-Jabonero, Carmen, Barreto, Africa, Welton, Ellsworth J., Gil-Díaz, Cristina, Carvajal-Pérez, Clara V., Comerón, Adolfo, García, Omaira, López-Cayuela, María Ángeles, Muñoz-Porcar, Constantino, Prats, Natalia, Ramos, Ramón, Rodríguez-Gómez, Alejandro, Toledano, Carlos, Torres, Carlos F., Ministerio de Ciencia e Innovación (España), European Commission, Junta de Castilla y León, Agencia Estatal de Investigación (España), Sicard, Michaël, Córdoba-Jabonero, Carmen, Barreto, Africa, Welton, Ellsworth J., Gil-Díaz, Cristina, Carvajal-Pérez, Clara V., Comerón, Adolfo, García, Omaira, López-Cayuela, María Ángeles, Muñoz-Porcar, Constantino, Prats, Natalia, Ramos, Ramón, Rodríguez-Gómez, Alejandro, Toledano, Carlos, and Torres, Carlos F.

Abstract

The volcanic eruption of Cumbre Vieja (La Palma Island, Spain), started on 19 September 2021 and was declared terminated on 25 December 2021. A complete set of aerosol measurements were deployed around the volcano within the first month of the eruptive activity. This paper describes the results of the observations made at Tazacorte on the west bank of the island where a polarized micro-pulse lidar was deployed. The analyzed two-and-a-half months (16 October–31 December) reveal that the peak height of the lowermost and strongest volcanic plume did not exceed 3 km (the mean of the hourly values is 1.43 ± 0.45 km over the whole period) and was highly variable. The peak height of the lowermost volcanic plume steadily increased until week 11 after the eruption started (and 3 weeks before its end) and started decreasing afterward. The ash mass concentration was assessed with a method based on the polarization capability of the instrument. Two days with a high ash load were selected: The ash backscatter coefficient, aerosol optical depth, and the volume and particle depolarization ratios were, respectively, 3.6 (2.4) Mmsr, 0.52 (0.19), 0.13 (0.07) and 0.23 (0.13) on 18 October (15 November). Considering the limitation of current remote sensing techniques to detect large-to-giant particles, the ash mass concentration on the day with the highest ash load (18 October) was estimated to have peaked in the range of 800–3200 µg m in the lowermost layer below 2.5 km.

Published
2022

7. Volcanic Eruption of Cumbre Vieja, La Palma, Spain: A First Insight to the Particulate Matter Injected in the Troposphere

Author

Sicard, Michaël, primary, Córdoba-Jabonero, Carmen, additional, Barreto, Africa, additional, Welton, Ellsworth J., additional, Gil-Díaz, Cristina, additional, Carvajal-Pérez, Clara V., additional, Comerón, Adolfo, additional, García, Omaira, additional, García, Rosa, additional, López-Cayuela, María-Ángeles, additional, Muñoz-Porcar, Constantino, additional, Prats, Natalia, additional, Ramos, Ramón, additional, Rodríguez-Gómez, Alejandro, additional, Toledano, Carlos, additional, and Torres, Carlos, additional

Published
2022
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8. Improved ozone monitoring by ground-based FTIR spectrometry

Author

García, Omaira Elena, primary, Sanromá, Esther, additional, Schneider, Matthias, additional, Hase, Frank, additional, León-Luis, Sergio Fabián, additional, Blumenstock, Thomas, additional, Sepúlveda, Eliezer, additional, Redondas, Alberto, additional, Carreño, Virgilio, additional, Torres, Carlos, additional, and Prats, Natalia, additional

Published
2022
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10. Twenty years of ground-based NDACC FTIR spectrometry at Izaña Observatory – overview and long-term comparison to other techniques

Author

García, Omaira E., primary, Schneider, Matthias, additional, Sepúlveda, Eliezer, additional, Hase, Frank, additional, Blumenstock, Thomas, additional, Cuevas, Emilio, additional, Ramos, Ramón, additional, Gross, Jochen, additional, Barthlott, Sabine, additional, Röhling, Amelie N., additional, Sanromá, Esther, additional, González, Yenny, additional, Gómez-Peláez, Ángel J., additional, Navarro-Comas, Mónica, additional, Puentedura, Olga, additional, Yela, Margarita, additional, Redondas, Alberto, additional, Carreño, Virgilio, additional, León-Luis, Sergio F., additional, Reyes, Enrique, additional, García, Rosa D., additional, Rivas, Pedro P., additional, Romero-Campos, Pedro M., additional, Torres, Carlos, additional, Prats, Natalia, additional, Hernández, Miguel, additional, and López, César, additional

Published
2021
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11. Changes in black carbon emissions over Europe due to COVID-19 lockdowns

Author

European Commission, Pandolfi, Marco [0000-0002-7493-7213], Evangeliou, Nikolaos, Platt, Stephen M., Eckhardt, Sabine, Lund Myhre, Cathrine, Laj, Paolo, Alados-Arboledas, Lucas, Backman, John, Brem, Benjamin T., Fiebig, Markus, Flentje, Harald, Marinoni, Angela, Pandolfi, Marco, Yus-Díez, Jesús, Prats, Natalia, Putaud, Jean-Philippe, Sellegri, Karine, Sorribas, Mar, Eleftheriadis, Konstantinos, Vratolis, Stergios, Wiedensohler, Alfred, Stohl, Andreas, European Commission, Pandolfi, Marco [0000-0002-7493-7213], Evangeliou, Nikolaos, Platt, Stephen M., Eckhardt, Sabine, Lund Myhre, Cathrine, Laj, Paolo, Alados-Arboledas, Lucas, Backman, John, Brem, Benjamin T., Fiebig, Markus, Flentje, Harald, Marinoni, Angela, Pandolfi, Marco, Yus-Díez, Jesús, Prats, Natalia, Putaud, Jean-Philippe, Sellegri, Karine, Sorribas, Mar, Eleftheriadis, Konstantinos, Vratolis, Stergios, Wiedensohler, Alfred, and Stohl, Andreas

Abstract

Following the emergence of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) responsible for COVID-19 in December 2019 in Wuhan (China) and its spread to the rest of the world, the World Health Organization declared a global pandemic in March 2020. Without effective treatment in the initial pandemic phase, social distancing and mandatory quarantines were introduced as the only available preventative measure. In contrast to the detrimental societal impacts, air quality improved in all countries in which strict lockdowns were applied, due to lower pollutant emissions. Here we investigate the effects of the COVID-19 lockdowns in Europe on ambient black carbon (BC), which affects climate and damages health, using in situ observations from 17 European stations in a Bayesian inversion framework. BC emissions declined by 23 kt in Europe (20 % in Italy, 40 % in Germany, 34 % in Spain, 22 % in France) during lockdowns compared to the same period in the previous 5 years, which is partially attributed to COVID-19 measures. BC temporal variation in the countries enduring the most drastic restrictions showed the most distinct lockdown impacts. Increased particle light absorption in the beginning of the lockdown, confirmed by assimilated satellite and remote sensing data, suggests residential combustion was the dominant BC source. Accordingly, in central and Eastern Europe, which experienced lower than average temperatures, BC was elevated compared to the previous 5 years. Nevertheless, an average decrease of 11 % was seen for the whole of Europe compared to the start of the lockdown period, with the highest peaks in France (42 %), Germany (21 %), UK (13 %), Spain (11 %) and Italy (8 %). Such a decrease was not seen in the previous years, which also confirms the impact of COVID-19 on the European emissions of BC.

Published
2021

12. Improved ozone monitoring by ground-based FTIR spectrometry

Author

García, Omaira E., primary, Sanromá, Esther, additional, Schneider, Matthias, additional, Hase, Frank, additional, León-Luis, Sergio Fabián, additional, Blumenstock, Thomas, additional, Sepúlveda, Eliezer, additional, Redondas, Alberto, additional, Carreño, Virgilio, additional, Torres, Carlos, additional, and Prats, Natalia, additional

Published
2021
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13. A global analysis of climate-relevant aerosol properties retrieved from the network of Global Atmosphere Watch (GAW) near-surface observatories

Author

Laj, Paolo, Bigi, Alessandro, Rose, Clemence, Andrews, Elisabeth, Lund Myhre, Cathrine, Collaud Coen, Martine, Lin, Yong, Wiedensohler, Alfred, Schulz, Michael, Ogren, John A., Fiebig, Markus, Gliss, Jonas, Mortier, Augustin, Pandolfi, Marco, Petaja, Tuukka, Kim, Sang-Woo, Aas, Wenche, Putaud, Jean-Philippe, Mayol-Bracero, Olga, Keywood, Melita, Labrador, Lorenzo, Aalto, Pasi, Ahlberg, Erik, Alados Arboledas, Lucas, Alastuey, Andres, Andrade, Marcos, Artinano, Begona, Ausmeel, Stina, Arsov, Todor, Asmi, Eija, Backman, John, Baltensperger, Urs, Bastian, Susanne, Bath, Olaf, Beukes, Johan Paul, Brem, Benjamin T., Bukowiecki, Nicolas, Conil, Sebastien, Couret, Cedric, Day, Derek, Dayantolis, Wan, Degorska, Anna, Eleftheriadis, Konstantinos, Fetfatzis, Prodromos, Favez, Olivier, Flentje, Harald, Gini, Maria I., Gregoric, Asta, Gysel-Beer, Martin, Hallar, A. Gannet, Hand, Jenny, Hoffer, Andras, Hueglin, Christoph, Hooda, Rakesh K., Hyvarinen, Antti, Kalapov, Ivo, Kalivitis, Nikos, Kasper-Giebl, Anne, Kim, Jeong Eun, Kouvarakis, Giorgos, Kranjc, Irena, Krejci, Radovan, Kulmala, Markku, Labuschagne, Casper, Lee, Hae-Jung, Lihavainen, Heikki, Lin, Neng-Huei, Loeschau, Gunter, Luoma, Krista, Marinoni, Angela, Dos Santos, Sebastiao Martins, Meinhardt, Frank, Merkel, Maik, Metzger, Jean-Marc, Mihalopoulos, Nikolaos, Nhat, Anh, Ondracek, Jakub, Perez, Noemi, Perrone, Maria Rita, Petit, Jean-Eudes, Picard, David, Pichon, Jean-Marc, Pont, Veronique, Prats, Natalia, Prenni, Anthony, Reisen, Fabienne, Romano, Salvatore, Sellegri, Karine, Sharma, Sangeeta, Schauer, Gerhard, Sheridan, Patrick, Sherman, James Patrick, Schuetze, Maik, Schwerin, Andreas, Sohmer, Ralf, Sorribas, Mar, Steinbacher, Martin, Sun, Junying, Titos, Gloria, Toczko, Barbara, Tuch, Thomas, Tulet, Pierre, Tunved, Peter, Vakkari, Ville, Velarde, Fernando, Velasquez, Patricio, Villani, Paolo, Vratolis, Sterios, Wang, Sheng-Hsiang, Weinhold, Kay, Weller, Rolf, Yela, Margarita, Yus-Diez, Jesus, Zdimal, Vladimir, Zieger, Paul, Zikova, Nadezda, Laj, Paolo, Bigi, Alessandro, Rose, Clemence, Andrews, Elisabeth, Lund Myhre, Cathrine, Collaud Coen, Martine, Lin, Yong, Wiedensohler, Alfred, Schulz, Michael, Ogren, John A., Fiebig, Markus, Gliss, Jonas, Mortier, Augustin, Pandolfi, Marco, Petaja, Tuukka, Kim, Sang-Woo, Aas, Wenche, Putaud, Jean-Philippe, Mayol-Bracero, Olga, Keywood, Melita, Labrador, Lorenzo, Aalto, Pasi, Ahlberg, Erik, Alados Arboledas, Lucas, Alastuey, Andres, Andrade, Marcos, Artinano, Begona, Ausmeel, Stina, Arsov, Todor, Asmi, Eija, Backman, John, Baltensperger, Urs, Bastian, Susanne, Bath, Olaf, Beukes, Johan Paul, Brem, Benjamin T., Bukowiecki, Nicolas, Conil, Sebastien, Couret, Cedric, Day, Derek, Dayantolis, Wan, Degorska, Anna, Eleftheriadis, Konstantinos, Fetfatzis, Prodromos, Favez, Olivier, Flentje, Harald, Gini, Maria I., Gregoric, Asta, Gysel-Beer, Martin, Hallar, A. Gannet, Hand, Jenny, Hoffer, Andras, Hueglin, Christoph, Hooda, Rakesh K., Hyvarinen, Antti, Kalapov, Ivo, Kalivitis, Nikos, Kasper-Giebl, Anne, Kim, Jeong Eun, Kouvarakis, Giorgos, Kranjc, Irena, Krejci, Radovan, Kulmala, Markku, Labuschagne, Casper, Lee, Hae-Jung, Lihavainen, Heikki, Lin, Neng-Huei, Loeschau, Gunter, Luoma, Krista, Marinoni, Angela, Dos Santos, Sebastiao Martins, Meinhardt, Frank, Merkel, Maik, Metzger, Jean-Marc, Mihalopoulos, Nikolaos, Nhat, Anh, Ondracek, Jakub, Perez, Noemi, Perrone, Maria Rita, Petit, Jean-Eudes, Picard, David, Pichon, Jean-Marc, Pont, Veronique, Prats, Natalia, Prenni, Anthony, Reisen, Fabienne, Romano, Salvatore, Sellegri, Karine, Sharma, Sangeeta, Schauer, Gerhard, Sheridan, Patrick, Sherman, James Patrick, Schuetze, Maik, Schwerin, Andreas, Sohmer, Ralf, Sorribas, Mar, Steinbacher, Martin, Sun, Junying, Titos, Gloria, Toczko, Barbara, Tuch, Thomas, Tulet, Pierre, Tunved, Peter, Vakkari, Ville, Velarde, Fernando, Velasquez, Patricio, Villani, Paolo, Vratolis, Sterios, Wang, Sheng-Hsiang, Weinhold, Kay, Weller, Rolf, Yela, Margarita, Yus-Diez, Jesus, Zdimal, Vladimir, Zieger, Paul, and Zikova, Nadezda

Abstract

Aerosol particles are essential constituents of the Earth's atmosphere, impacting the earth radiation balance directly by scattering and absorbing solar radiation, and indirectly by acting as cloud condensation nuclei. In contrast to most greenhouse gases, aerosol particles have short atmospheric residence times, resulting in a highly heterogeneous distribution in space and time. There is a clear need to document this variability at regional scale through observations involving, in particular, the in situ near-surface segment of the atmospheric observation system. This paper will provide the widest effort so far to document variability of climate-relevant in situ aerosol properties (namely wavelength dependent particle light scattering and absorption coefficients, particle number concentration and particle number size distribution) from all sites connected to the Global Atmosphere Watch network. High-quality data from almost 90 stations worldwide have been collected and controlled for quality and are reported for a reference year in 2017, providing a very extended and robust view of the variability of these variables worldwide. The range of variability observed worldwide for light scattering and absorption coefficients, single-scattering albedo, and particle number concentration are presented together with preliminary information on their long-term trends and comparison with model simulation for the different stations. The scope of the present paper is also to provide the necessary suite of information, including data provision procedures, quality control and analysis, data policy, and usage of the ground-based aerosol measurement network. It delivers to users of the World Data Centre on Aerosol, the required confidence in data products in the form of a fully characterized value chain, including uncertainty estimation and requirements for contributing to the global climate monitoring system.

Published
2020
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14. Multidecadal trend analysis of in situ aerosol radiative properties around the world

Author

Collaud Coen, Martine, Andrews, Elisabeth, Alastuey, Andres, Petkov Arsov, Todor, Backman, John, Brem, Benjamin T., Bukowiecki, Nicolas, Couret, Cedric, Eleftheriadis, Konstantinos, Flentje, Harald, Fiebig, Markus, Gysel-Beer, Martin, Hand, Jenny L., Hoffer, Andras, Hooda, Rakesh, Hueglin, Christoph, Joubert, Warren, Keywood, Melita, Kim, Jeong Eun, Kim, Sang-Woo, Labuschagne, Casper, Lin, Neng-Huei, Lin, Yong, Lund Myhre, Cathrine, Luoma, Krista, Lyamani, Hassan, Marinoni, Angela, Mayol-Bracero, Olga L., Mihalopoulos, Nikos, Pandolfi, Marco, Prats, Natalia, Prenni, Anthony J., Putaud, Jean-Philippe, Ries, Ludwig, Reisen, Fabienne, Sellegri, Karine, Sharma, Sangeeta, Sheridan, Patrick, Sherman, James Patrick, Sun, Junying, Titos, Gloria, Torres, Elvis, Tuch, Thomas, Weller, Rolf, Wiedensohler, Alfred, Zieger, Paul, Laj, Paolo, Collaud Coen, Martine, Andrews, Elisabeth, Alastuey, Andres, Petkov Arsov, Todor, Backman, John, Brem, Benjamin T., Bukowiecki, Nicolas, Couret, Cedric, Eleftheriadis, Konstantinos, Flentje, Harald, Fiebig, Markus, Gysel-Beer, Martin, Hand, Jenny L., Hoffer, Andras, Hooda, Rakesh, Hueglin, Christoph, Joubert, Warren, Keywood, Melita, Kim, Jeong Eun, Kim, Sang-Woo, Labuschagne, Casper, Lin, Neng-Huei, Lin, Yong, Lund Myhre, Cathrine, Luoma, Krista, Lyamani, Hassan, Marinoni, Angela, Mayol-Bracero, Olga L., Mihalopoulos, Nikos, Pandolfi, Marco, Prats, Natalia, Prenni, Anthony J., Putaud, Jean-Philippe, Ries, Ludwig, Reisen, Fabienne, Sellegri, Karine, Sharma, Sangeeta, Sheridan, Patrick, Sherman, James Patrick, Sun, Junying, Titos, Gloria, Torres, Elvis, Tuch, Thomas, Weller, Rolf, Wiedensohler, Alfred, Zieger, Paul, and Laj, Paolo

Abstract

In order to assess the evolution of aerosol parameters affecting climate change, a long-term trend analysis of aerosol optical properties was performed on time series from 52 stations situated across five continents. The time series of measured scattering, backscattering and absorption coefficients as well as the derived single scattering albedo, backscattering fraction, scattering and absorption Angstrom exponents covered at least 10 years and up to 40 years for some stations. The non-parametric seasonal Mann-Kendall (MK) statistical test associated with several pre-whitening methods and with Sen's slope was used as the main trend analysis method. Comparisons with general least mean square associated with autoregressive bootstrap (GLS/ARB) and with standard least mean square analysis (LMS) enabled confirmation of the detected MK statistically significant trends and the assessment of advantages and limitations of each method. Currently, scattering and backscattering coefficient trends are mostly decreasing in Europe and North America and are not statistically significant in Asia, while polar stations exhibit a mix of increasing and decreasing trends. A few increasing trends are also found at some stations in North America and Australia. Absorption coefficient time series also exhibit primarily decreasing trends. For single scattering albedo, 52 % of the sites exhibit statistically significant positive trends, mostly in Asia, eastern/northern Europe and the Arctic, 22 % of sites exhibit statistically significant negative trends, mostly in central Europe and central North America, while the remaining 26 % of sites have trends which are not statistically significant. In addition to evaluating trends for the overall time series, the evolution of the trends in sequential 10-year segments was also analyzed. For scattering and backscattering, statistically significant increasing 10-year trends are primarily found for earlier periods (10-year trends ending in 2010-2015) for

Published
2020
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15. Multidecadal trend analysis of aerosol radiative properties at a global scale

Author

Collaud Coen, Martine, Andrews, Elisabeth, Alastuey, Andrès, Arsov, Todor Petkov, Backman, John, Brem, Benjamin Tobias, Bukowiecki, Nicolas Bukowiecki, Couret, Cédric Couret, Eleftheriadis, Konstantinos, Flentje, Harald, Fiebig, Markus, Gysel-Beer, Martin, Hand, Jenny L., Hoffer, Andràs, Hooda, Rakesh, Hueglin, Christoph, Joubert, Warren, Keywood, Melita, Kim, Jeong Eun, Kim, Sang-Woo, Labuschagne, Labuschagne, Lin, Neng-Huei, Lin, Yong, Lund Myhre, Cathrine, Luoma, Krista, Lyamani, Hassan, Marinoni, Angela, Mayol-Bracero, Olga L., Mihalopoulos, Nikos, Pandolfi, Marco, Prats, Natalia, Prenni, Anthony J., Putaud, Jean-Philippe, Ries, Ludwig, Riesen, Fabienne, Sellegri, Karine, Sharma, Sangeeta, Sheridan, Patrick, Sherman, James Patrick, Sun, Junying, Titos, Gloria, Torres, Elvis, Tuch, Thomas, Weller, Rolf, Wiedensohler, Alfred, Zieger, Paul, Laj, Paolo, Collaud Coen, Martine, Andrews, Elisabeth, Alastuey, Andrès, Arsov, Todor Petkov, Backman, John, Brem, Benjamin Tobias, Bukowiecki, Nicolas Bukowiecki, Couret, Cédric Couret, Eleftheriadis, Konstantinos, Flentje, Harald, Fiebig, Markus, Gysel-Beer, Martin, Hand, Jenny L., Hoffer, Andràs, Hooda, Rakesh, Hueglin, Christoph, Joubert, Warren, Keywood, Melita, Kim, Jeong Eun, Kim, Sang-Woo, Labuschagne, Labuschagne, Lin, Neng-Huei, Lin, Yong, Lund Myhre, Cathrine, Luoma, Krista, Lyamani, Hassan, Marinoni, Angela, Mayol-Bracero, Olga L., Mihalopoulos, Nikos, Pandolfi, Marco, Prats, Natalia, Prenni, Anthony J., Putaud, Jean-Philippe, Ries, Ludwig, Riesen, Fabienne, Sellegri, Karine, Sharma, Sangeeta, Sheridan, Patrick, Sherman, James Patrick, Sun, Junying, Titos, Gloria, Torres, Elvis, Tuch, Thomas, Weller, Rolf, Wiedensohler, Alfred, Zieger, Paul, and Laj, Paolo

Abstract

In order to assess the global evolution of aerosol parameters affecting climate change, a long-term trend analyses of aerosol optical properties were performed on time series from 52 stations situated across five continents. The time series of measured scattering, backscattering and absorption coefficients as well as the derived single scattering albedo, backscattering fraction, scattering and absorption Ångström exponents covered at least 10 years and up to 40 years for some stations. The non-parametric seasonal Mann-Kendall (MK) statistical test associated with several prewhitening methods and with the Sen’s slope were used as main trend analysis methods. Comparisons with General Least Mean Square associated with Autoregressive Bootstrap (GLS/ARB) and with standard Least Mean Square analysis (LMS) enabled confirmation of the detected MK statistically significant trends and the assessment of advantages and limitations of each method. Currently, scattering and backscattering coefficients trends are mostly decreasing in Europe and North America and are not statistically significant in Asia, while polar stations exhibit a mix of increasing and decreasing trends. A few increasing trends are also found at some stations in North America and Australia. Absorption coefficients time series also exhibit primarily decreasing trends. For single scattering albedo, 52% of the sites exhibit statistically significant positive trends, mostly in Asia, Eastern/Northern Europe and Arctic, 18% of sites exhibit statistically significant negative trends, mostly in central Europe and central North America, while the remaining 30% of sites have trends, which are not statistically significant. In addition to evaluating trends for the overall time series, the evolution of the trends in sequential 10 year segments was also analyzed. For scattering and backscattering, statistically significant increasing 10 year trends are primarily found for earlier periods (10 year trends ending in 2010-2015

Published
2020

16. Changes in black carbon emissions over Europe due to COVID-19 lockdowns

Author

Evangeliou, Nikolaos, primary, Platt, Stephen M., additional, Eckhardt, Sabine, additional, Lund Myhre, Cathrine, additional, Laj, Paolo, additional, Alados-Arboledas, Lucas, additional, Backman, John, additional, Brem, Benjamin T., additional, Fiebig, Markus, additional, Flentje, Harald, additional, Marinoni, Angela, additional, Pandolfi, Marco, additional, Yus-Dìez, Jesus, additional, Prats, Natalia, additional, Putaud, Jean P., additional, Sellegri, Karine, additional, Sorribas, Mar, additional, Eleftheriadis, Konstantinos, additional, Vratolis, Stergios, additional, Wiedensohler, Alfred, additional, and Stohl, Andreas, additional

Published
2021
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17. Supplementary material to "Changes in black carbon emissions over Europe due to COVID-19 lockdowns"

Author

Evangeliou, Nikolaos, primary, Platt, Stephen M., additional, Eckhardt, Sabine, additional, Lund Myhre, Cathrine, additional, Laj, Paolo, additional, Alados-Arboledas, Lucas, additional, Backman, John, additional, Brem, Benjamin T., additional, Fiebig, Markus, additional, Flentje, Harald, additional, Marinoni, Angela, additional, Pandolfi, Marco, additional, Yus-Dìez, Jesus, additional, Prats, Natalia, additional, Putaud, Jean P., additional, Sellegri, Karine, additional, Sorribas, Mar, additional, Eleftheriadis, Konstantinos, additional, Vratolis, Stergios, additional, Wiedensohler, Alfred, additional, and Stohl, Andreas, additional

Published
2020
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18. Changes in black carbon emissions over Europe due to COVID-19 lockdowns

Author

Evangeliou, Nikolaos, primary, Platt, Stephen M., additional, Eckhardt, Sabine, additional, Lund Myhre, Cathrine, additional, Laj, Paolo, additional, Alados-Arboledas, Lucas, additional, Backman, John, additional, Brem, Benjamin T., additional, Fiebig, Markus, additional, Flentje, Harald, additional, Marinoni, Angela, additional, Pandolfi, Marco, additional, Yus-Dìez, Jesus, additional, Prats, Natalia, additional, Putaud, Jean P., additional, Sellegri, Karine, additional, Sorribas, Mar, additional, Eleftheriadis, Konstantinos, additional, Vratolis, Stergios, additional, Wiedensohler, Alfred, additional, and Stohl, Andreas, additional

Published
2020
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19. A global analysis of climate-relevant aerosol properties retrieved from the network of Global Atmosphere Watch (GAW) near-surface observatories

Author

Laj, Paolo, primary, Bigi, Alessandro, additional, Rose, Clémence, additional, Andrews, Elisabeth, additional, Lund Myhre, Cathrine, additional, Collaud Coen, Martine, additional, Lin, Yong, additional, Wiedensohler, Alfred, additional, Schulz, Michael, additional, Ogren, John A., additional, Fiebig, Markus, additional, Gliß, Jonas, additional, Mortier, Augustin, additional, Pandolfi, Marco, additional, Petäja, Tuukka, additional, Kim, Sang-Woo, additional, Aas, Wenche, additional, Putaud, Jean-Philippe, additional, Mayol-Bracero, Olga, additional, Keywood, Melita, additional, Labrador, Lorenzo, additional, Aalto, Pasi, additional, Ahlberg, Erik, additional, Alados Arboledas, Lucas, additional, Alastuey, Andrés, additional, Andrade, Marcos, additional, Artíñano, Begoña, additional, Ausmeel, Stina, additional, Arsov, Todor, additional, Asmi, Eija, additional, Backman, John, additional, Baltensperger, Urs, additional, Bastian, Susanne, additional, Bath, Olaf, additional, Beukes, Johan Paul, additional, Brem, Benjamin T., additional, Bukowiecki, Nicolas, additional, Conil, Sébastien, additional, Couret, Cedric, additional, Day, Derek, additional, Dayantolis, Wan, additional, Degorska, Anna, additional, Eleftheriadis, Konstantinos, additional, Fetfatzis, Prodromos, additional, Favez, Olivier, additional, Flentje, Harald, additional, Gini, Maria I., additional, Gregorič, Asta, additional, Gysel-Beer, Martin, additional, Hallar, A. Gannet, additional, Hand, Jenny, additional, Hoffer, Andras, additional, Hueglin, Christoph, additional, Hooda, Rakesh K., additional, Hyvärinen, Antti, additional, Kalapov, Ivo, additional, Kalivitis, Nikos, additional, Kasper-Giebl, Anne, additional, Kim, Jeong Eun, additional, Kouvarakis, Giorgos, additional, Kranjc, Irena, additional, Krejci, Radovan, additional, Kulmala, Markku, additional, Labuschagne, Casper, additional, Lee, Hae-Jung, additional, Lihavainen, Heikki, additional, Lin, Neng-Huei, additional, Löschau, Gunter, additional, Luoma, Krista, additional, Marinoni, Angela, additional, Martins Dos Santos, Sebastiao, additional, Meinhardt, Frank, additional, Merkel, Maik, additional, Metzger, Jean-Marc, additional, Mihalopoulos, Nikolaos, additional, Nguyen, Nhat Anh, additional, Ondracek, Jakub, additional, Pérez, Noemi, additional, Perrone, Maria Rita, additional, Petit, Jean-Eudes, additional, Picard, David, additional, Pichon, Jean-Marc, additional, Pont, Veronique, additional, Prats, Natalia, additional, Prenni, Anthony, additional, Reisen, Fabienne, additional, Romano, Salvatore, additional, Sellegri, Karine, additional, Sharma, Sangeeta, additional, Schauer, Gerhard, additional, Sheridan, Patrick, additional, Sherman, James Patrick, additional, Schütze, Maik, additional, Schwerin, Andreas, additional, Sohmer, Ralf, additional, Sorribas, Mar, additional, Steinbacher, Martin, additional, Sun, Junying, additional, Titos, Gloria, additional, Toczko, Barbara, additional, Tuch, Thomas, additional, Tulet, Pierre, additional, Tunved, Peter, additional, Vakkari, Ville, additional, Velarde, Fernando, additional, Velasquez, Patricio, additional, Villani, Paolo, additional, Vratolis, Sterios, additional, Wang, Sheng-Hsiang, additional, Weinhold, Kay, additional, Weller, Rolf, additional, Yela, Margarita, additional, Yus-Diez, Jesus, additional, Zdimal, Vladimir, additional, Zieger, Paul, additional, and Zikova, Nadezda, additional

Published
2020
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20. Multidecadal trend analysis of in situ aerosol radiative properties around the world

Author

Collaud Coen, Martine, primary, Andrews, Elisabeth, additional, Alastuey, Andrés, additional, Arsov, Todor Petkov, additional, Backman, John, additional, Brem, Benjamin T., additional, Bukowiecki, Nicolas, additional, Couret, Cédric, additional, Eleftheriadis, Konstantinos, additional, Flentje, Harald, additional, Fiebig, Markus, additional, Gysel-Beer, Martin, additional, Hand, Jenny L., additional, Hoffer, András, additional, Hooda, Rakesh, additional, Hueglin, Christoph, additional, Joubert, Warren, additional, Keywood, Melita, additional, Kim, Jeong Eun, additional, Kim, Sang-Woo, additional, Labuschagne, Casper, additional, Lin, Neng-Huei, additional, Lin, Yong, additional, Lund Myhre, Cathrine, additional, Luoma, Krista, additional, Lyamani, Hassan, additional, Marinoni, Angela, additional, Mayol-Bracero, Olga L., additional, Mihalopoulos, Nikos, additional, Pandolfi, Marco, additional, Prats, Natalia, additional, Prenni, Anthony J., additional, Putaud, Jean-Philippe, additional, Ries, Ludwig, additional, Reisen, Fabienne, additional, Sellegri, Karine, additional, Sharma, Sangeeta, additional, Sheridan, Patrick, additional, Sherman, James Patrick, additional, Sun, Junying, additional, Titos, Gloria, additional, Torres, Elvis, additional, Tuch, Thomas, additional, Weller, Rolf, additional, Wiedensohler, Alfred, additional, Zieger, Paul, additional, and Laj, Paolo, additional

Published
2020
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21. Supplementary material to "A global analysis of climate-relevant aerosol properties retrieved from the network of GAW near-surface observatories"

Author

Laj, Paolo, primary, Bigi, Alessandro, additional, Rose, Clémence, additional, Andrews, Elisabeth, additional, Lund Myhre, Cathrine, additional, Collaud Coen, Martine, additional, Wiedensohler, Alfred, additional, Schultz, Michael, additional, Ogren, John A., additional, Fiebig, Markus, additional, Gliß, Jonas, additional, Mortier, Augustin, additional, Pandolfi, Marco, additional, Petäjä, Tuukka, additional, Kim, Sang-Woo, additional, Aas, Wenche, additional, Putaud, Jean-Phillipe, additional, Mayol-Bracero, Olga, additional, Keywood, Melita, additional, Labrador, Lorenzo, additional, Aalto, Pasi, additional, Ahlberg, Erik, additional, Alados Arboledas, Lucas, additional, Alastuey, Andrés, additional, Andrade, Marcos, additional, Artíñano, Begoña, additional, Ausmeel, Stina, additional, Arsov, Todor, additional, Asmi, Eija, additional, Backman, John, additional, Baltensperger, Urs, additional, Bastian, Susanne, additional, Bath, Olaf, additional, Beukes, Johan Paul, additional, Brem, Benjamin T., additional, Bukowiecki, Nicolas, additional, Conil, Sébastien, additional, Couret, Cedric, additional, Day, Derek, additional, Dayantolis, Wan, additional, Degorska, Anna, additional, Dos Santos, Sebastiao Martins, additional, Eleftheriadis, Konstantinos, additional, Fetfatzis, Prodromos, additional, Favez, Olivier, additional, Flentje, Harald, additional, Gini, Maria I., additional, Gregorič, Asta, additional, Gysel-Beer, Martin, additional, Hallar, Gannet A., additional, Hand, Jenny, additional, Hoffer, Andras, additional, Hueglin, Christoph, additional, Hooda, Rakesh K., additional, Hyvärinen, Antti, additional, Kalapov, Ivo, additional, Kalivitis, Nikos, additional, Kasper-Giebl, Anne, additional, Kim, Jeong Eun, additional, Kouvarakis, Giorgos, additional, Kranjc, Irena, additional, Krejci, Radovan, additional, Kulmala, Markku, additional, Labuschagne, Casper, additional, Lee, Hae-Jung, additional, Lihavainen, Heikki, additional, Lin, Neng-Huei, additional, Löschau, Gunter, additional, Luoma, Krista, additional, Marinoni, Angela, additional, Meinhardt, Frank, additional, Merkel, Maik, additional, Metzger, Jean-Marc, additional, Mihalopoulos, Nikolaos, additional, Nguyen, Nhat Anh, additional, Ondracek, Jakub, additional, Peréz, Noemi, additional, Perrone, Maria Rita, additional, Petit, Jean-Eudes, additional, Picard, David, additional, Pichon, Jean-Marc, additional, Pont, Véronique, additional, Prats, Natalia, additional, Prenni, Anthony, additional, Reisen, Fabienne, additional, Romano, Salvatore, additional, Sellegri, Karine, additional, Sharma, Sangeeta, additional, Schauer, Gerhard, additional, Sheridan, Patrick, additional, Sherman, James Patrick, additional, Schütze, Maik, additional, Schwerin, Andreas, additional, Sohmer, Ralf, additional, Sorribas, Mar, additional, Steinbacher, Martin, additional, Sun, Junying, additional, Titos, Gloria, additional, Tokzko, Barbara, additional, Tuch, Thomas, additional, Tulet, Pierre, additional, Tunved, Peter, additional, Vakkari, Ville, additional, Velarde, Fernando, additional, Velasquez, Patricio, additional, Villani, Paolo, additional, Vratolis, Sterios, additional, Wang, Sheng-Hsiang, additional, Weinhold, Kay, additional, Weller, Rolf, additional, Yela, Margarita, additional, Yus-Diez, Jesus, additional, Zdimal, Vladimir, additional, Zieger, Paul, additional, and Zikova, Nadezda, additional

Published
2020
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22. A global analysis of climate-relevant aerosol properties retrieved from the network of GAW near-surface observatories

Author

Laj, Paolo, primary, Bigi, Alessandro, additional, Rose, Clémence, additional, Andrews, Elisabeth, additional, Lund Myhre, Cathrine, additional, Collaud Coen, Martine, additional, Wiedensohler, Alfred, additional, Schultz, Michael, additional, Ogren, John A., additional, Fiebig, Markus, additional, Gliß, Jonas, additional, Mortier, Augustin, additional, Pandolfi, Marco, additional, Petäjä, Tuukka, additional, Kim, Sang-Woo, additional, Aas, Wenche, additional, Putaud, Jean-Phillipe, additional, Mayol-Bracero, Olga, additional, Keywood, Melita, additional, Labrador, Lorenzo, additional, Aalto, Pasi, additional, Ahlberg, Erik, additional, Alados Arboledas, Lucas, additional, Alastuey, Andrés, additional, Andrade, Marcos, additional, Artíñano, Begoña, additional, Ausmeel, Stina, additional, Arsov, Todor, additional, Asmi, Eija, additional, Backman, John, additional, Baltensperger, Urs, additional, Bastian, Susanne, additional, Bath, Olaf, additional, Beukes, Johan Paul, additional, Brem, Benjamin T., additional, Bukowiecki, Nicolas, additional, Conil, Sébastien, additional, Couret, Cedric, additional, Day, Derek, additional, Dayantolis, Wan, additional, Degorska, Anna, additional, Dos Santos, Sebastiao Martins, additional, Eleftheriadis, Konstantinos, additional, Fetfatzis, Prodromos, additional, Favez, Olivier, additional, Flentje, Harald, additional, Gini, Maria I., additional, Gregorič, Asta, additional, Gysel-Beer, Martin, additional, Hallar, Gannet A., additional, Hand, Jenny, additional, Hoffer, Andras, additional, Hueglin, Christoph, additional, Hooda, Rakesh K., additional, Hyvärinen, Antti, additional, Kalapov, Ivo, additional, Kalivitis, Nikos, additional, Kasper-Giebl, Anne, additional, Kim, Jeong Eun, additional, Kouvarakis, Giorgos, additional, Kranjc, Irena, additional, Krejci, Radovan, additional, Kulmala, Markku, additional, Labuschagne, Casper, additional, Lee, Hae-Jung, additional, Lihavainen, Heikki, additional, Lin, Neng-Huei, additional, Löschau, Gunter, additional, Luoma, Krista, additional, Marinoni, Angela, additional, Meinhardt, Frank, additional, Merkel, Maik, additional, Metzger, Jean-Marc, additional, Mihalopoulos, Nikolaos, additional, Nguyen, Nhat Anh, additional, Ondracek, Jakub, additional, Peréz, Noemi, additional, Perrone, Maria Rita, additional, Petit, Jean-Eudes, additional, Picard, David, additional, Pichon, Jean-Marc, additional, Pont, Véronique, additional, Prats, Natalia, additional, Prenni, Anthony, additional, Reisen, Fabienne, additional, Romano, Salvatore, additional, Sellegri, Karine, additional, Sharma, Sangeeta, additional, Schauer, Gerhard, additional, Sheridan, Patrick, additional, Sherman, James Patrick, additional, Schütze, Maik, additional, Schwerin, Andreas, additional, Sohmer, Ralf, additional, Sorribas, Mar, additional, Steinbacher, Martin, additional, Sun, Junying, additional, Titos, Gloria, additional, Tokzko, Barbara, additional, Tuch, Thomas, additional, Tulet, Pierre, additional, Tunved, Peter, additional, Vakkari, Ville, additional, Velarde, Fernando, additional, Velasquez, Patricio, additional, Villani, Paolo, additional, Vratolis, Sterios, additional, Wang, Sheng-Hsiang, additional, Weinhold, Kay, additional, Weller, Rolf, additional, Yela, Margarita, additional, Yus-Diez, Jesus, additional, Zdimal, Vladimir, additional, Zieger, Paul, additional, and Zikova, Nadezda, additional

Published
2020
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23. Multidecadal trend analysis of aerosol radiative properties at a global scale

Author

Collaud Coen, Martine, primary, Andrews, Elisabeth, additional, Alastuey, Andrés, additional, Arsov, Todor Petkov, additional, Backman, John, additional, Brem, Benjamin T., additional, Bukowiecki, Nicolas, additional, Couret, Cédric, additional, Eleftheriadis, Konstantinos, additional, Flentje, Harald, additional, Fiebig, Markus, additional, Gysel-Beer, Martin, additional, Hand, Jenny L., additional, Hoffer, András, additional, Hooda, Rakesh, additional, Hueglin, Christoph, additional, Joubert, Warren, additional, Keywood, Melita, additional, Kim, Jeong Eun, additional, Kim, Sang-Woo, additional, Labuschagne, Casper, additional, Lin, Neng-Huei, additional, Lin, Yong, additional, Lund Myhre, Cathrine, additional, Luoma, Krista, additional, Lyamani, Hassan, additional, Marinoni, Angela, additional, Mayol-Bracero, Olga L., additional, Mihalopoulos, Nikos, additional, Pandolfi, Marco, additional, Prats, Natalia, additional, Prenni, Anthony J., additional, Putaud, Jean-Philippe, additional, Ries, Ludwig, additional, Reisen, Fabienne, additional, Sellegri, Karine, additional, Sharma, Sangeeta, additional, Sheridan, Patrick, additional, Sherman, James Patrick, additional, Sun, Junying, additional, Titos, Gloria, additional, Torres, Elvis, additional, Tuch, Thomas, additional, Weller, Rolf, additional, Wiedensohler, Alfred, additional, Zieger, Paul, additional, and Laj, Paolo, additional

Published
2020
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24. Supplementary material to "Multidecadal trend analysis of aerosol radiative properties at a global scale"

Author

Collaud Coen, Martine, primary, Andrews, Elisabeth, additional, Alastuey, Andrés, additional, Arsov, Todor Petkov, additional, Backman, John, additional, Brem, Benjamin T., additional, Bukowiecki, Nicolas, additional, Couret, Cédric, additional, Eleftheriadis, Konstantinos, additional, Flentje, Harald, additional, Fiebig, Markus, additional, Gysel-Beer, Martin, additional, Hand, Jenny L., additional, Hoffer, András, additional, Hooda, Rakesh, additional, Hueglin, Christoph, additional, Joubert, Warren, additional, Keywood, Melita, additional, Kim, Jeong Eun, additional, Kim, Sang-Woo, additional, Labuschagne, Casper, additional, Lin, Neng-Huei, additional, Lin, Yong, additional, Lund Myhre, Cathrine, additional, Luoma, Krista, additional, Lyamani, Hassan, additional, Marinoni, Angela, additional, Mayol-Bracero, Olga L., additional, Mihalopoulos, Nikos, additional, Pandolfi, Marco, additional, Prats, Natalia, additional, Prenni, Anthony J., additional, Putaud, Jean-Philippe, additional, Ries, Ludwig, additional, Reisen, Fabienne, additional, Sellegri, Karine, additional, Sharma, Sangeeta, additional, Sheridan, Patrick, additional, Sherman, James Patrick, additional, Sun, Junying, additional, Titos, Gloria, additional, Torres, Elvis, additional, Tuch, Thomas, additional, Weller, Rolf, additional, Wiedensohler, Alfred, additional, Zieger, Paul, additional, and Laj, Paolo, additional

Published
2020
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25. PIXE analysis of desert dust aerosols collected on Whatman 41 cellulose filters

Author

Lucarelli, Franco, Chiari, Massimo, Calzolai, Giulia, Nava, Silvia, Rodríguez, Sergio, García, M. Isabel, Prospero, J. M., Zuidema, Paquita, Sosa, Elisa, Prats, Natalia, and Alastuey, Andrés

Abstract

Trabajo presentado a la 16th International Conference on Particle Induced X-ray Emission (PIXE), celebrada en Caldas da Rainha (Portugal) del 24 al 29 de marzo de 2019.

Published
2019

26. High variability of dust composition in the Saharan Air Layer

Author

Rodríguez, Sergio, Lucarelli, Franco, Nava, Silvia, García, M. Isabel, Calzolai, Giulia, Chiari, Massimo, López-Solano, Javier, Marrero, Carlos, Cuevas, Emilio, and Prats, Natalia

Subjects
Aerosol dust particles, Dust emissions, Satellite observations
Abstract

Trabajo presentado al EcoDesert International Symposium, celebrado en Almeria (España) del 20 al 22 de febrero e 2019., Every year, 1500-2000 Tg of dust are emitted from soil to the atmosphere. The resulting aerosol dust particles have a size ranging from sub-1 μm to tens of microns, and a lifetime from hours to two weeks. Aerosol dust impacts on climate and on biogeochemical cycles, and is involved in the Earth System. About 50 to 70% of global dust emissions occur in North Africa. Most of dust exports to the Atlantic occur in the so-called Saharan Air Layer, a warm, dry and dusty high-altitude air stream that reaches the Americas. At the Izaña Observatory, 2400 m.a.s.l. in Tenerife (Spain), we studied (i) the variability of dust composition in the Saharan Air Layer, (ii) the North African sources and (iii) the large-scale meteorology prompting the variability observed. For this purpose, we performed (i) one-hour resolution sampling of aerosols, followed by (ii) PIXE (Particle bombing Induced X Ray Emission) analysis, and (iii) further data interpretation with meteorological tools and satellite observations. During one-week dust events, we found that the ratios of some elements (e.g. Ca, Mg or K, among others) to Al (soil tracer) changed by a factor of about 2 in a few (5-7) hours. This high variability in dust points to a concatenation of the sources contributing to dust over the North Atlantic. By back-trajectory analysis, Median Ratios At Receptor plots and MODIS and MSG – SEVIRI satellite observations, we observed that the sources activated during the study period were located in topographical lows located in three main regions: NE Algeria – Tunisia (dust rich in Ca, Sr, Mg and K), W Algeria-E Morocco (Na and Cl) and N Mali-S Algeria (rich in Si and Fe). In a six-day period, there were seven concatenated impacts from the sources identified, which were traced by the variability in the ratios of the different elements to Al. These results provide a new and more complex view of the dust exported to the Atlantic, compared to the simplistic approach based on bulk-dust measurements and modelling. These results have implications of the impact and influence of dust on climate.

Published
2019

27. Improved ozone monitoring by ground-based FTIR spectrometry.

Author

García, Omaira E., Sanromá, Esther, Schneider, Matthias, Hase, Frank, León-Luis, Sergio F., Blumenstock, Thomas, Sepúlveda, Eliezer, Redondas, Alberto, Carreño, Virgilio, Torres, Carlos, and Prats, Natalia

Subjects
ATMOSPHERIC temperature, ATMOSPHERIC chemistry, ATMOSPHERIC composition, SPECTROMETRY, OZONE, SOLAR spectra, ATMOSPHERIC ozone
Abstract

Accurate observations of atmospheric ozone (O3) are essential to monitor in detail the key role of O3 in the atmospheric chemistry. The present paper examines the performance of different O3 retrieval strategies from FTIR (Fourier Transform InfraRed) spectrometry by using the 20-year time series of the high-resolution solar spectra acquired from 1999 to 2018 at the subtropical Izaña Observatory (IZO, Spain) within NDACC (Network for the Detection of Atmospheric Composition Change). In particular, the effect of two of the most influential factors have been investigated: the spectral region used for O3 retrievals and inclusion of an atmospheric temperature profile fit. The theoretical and experimental quality assessments of the different FTIR O3 products (total column, TC, amounts and volume mixing ratio, VMR, profiles) provide consistent results. Combining an optimal selection of spectral O3 absorption lines and a simultaneous temperature retrieval results in superior FTIR O3 products, with a precision greater than 0.6-0.7% for O3 TCs as compared to coincident NDACC Brewer observations used as reference. However, this improvement can be only achieved provided the FTIR spectrometer is properly characterised and stable over time. For unstable instruments, the temperature fit has been found to exhibit a strong negative influence on O3 retrievals by increasing the cross-interference between instrumental performance and temperature retrieval. This cross-interference becomes especially noticeable beyond the upper troposphere/lower stratosphere as documented theoretically, as well as experimentally by comparing FTIR O3 profiles to those measured using Electrochemical Concentration Cell (ECC) sondes within NDACC. Consequently, it should be taken into account for the reliable monitoring of O3 vertical distribution, especially on long-term timescales. [ABSTRACT FROM AUTHOR]

Published
2021
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28. Changes in black carbon emissions over Europe due to COVID-19 lockdowns.

Author

Evangeliou, Nikolaos, Platt, Stephen M., Eckhardt, Sabine, Lund Myhre, Cathrine, Laj, Paolo, Alados-Arboledas, Lucas, Backman, John, Brem, Benjamin T., Fiebig, Markus, Flentje, Harald, Marinoni, Angela, Pandolfi, Marco, Yus-Dìez, Jesus, Prats, Natalia, Putaud, Jean P., Sellegri, Karine, Sorribas, Mar, Eleftheriadis, Konstantinos, Vratolis, Stergios, and Wiedensohler, Alfred

Abstract

Following the emergence of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) responsible for COVID-19 in December 2019 in Wuhan (China) and its spread to the rest of the world, the World Health Organization declared a global pandemic in March 2020. Without effective treatment in the initial pandemic phase, social distancing and mandatory quarantines were introduced as the only available preventative measure. Despite the socioeconomic impacts, air quality improved due to lower pollutant emissions. Here we investigate the effects of the COVID-19 lockdowns on ambient black carbon (BC), which affects climate and damages health, using in-situ observations from 17 European stations in a Bayesian inversion framework. BC emissions declined by 11 % in Europe (20 % in Italy, 32 % in Germany, 20 % in Spain) during lockdown compared to the same period in the previous five years. BC temporal variation in the countries enduring the most drastic restrictions showed the most distinct lockdown impacts. Increased particle light absorption in at the beginning of the lockdown, confirmed by assimilated satellite and remote sensing data, suggests residential combustion was the dominant BC source. Accordingly, in Central and Eastern Europe, which experienced lower than average temperatures, BC was elevated compared to the previous five years. Except for the comparison of BC emissions in the lockdown with the previous five years, an immediate decrease was also seen, as compared with the period before the lockdown, which averaged about 10 % over Europe. Such a decrease was not seen in the previous years, which also confirms an impact on BC emissions from COVID-19. [ABSTRACT FROM AUTHOR]

Published
2020
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29. El cielo más anaranjado de Canarias.

Author

PRATS, NATALIA and SUÁREZ, DAVID

Subjects
*ATMOSPHERIC physics, *CARNIVALS, *METEOROLOGICAL services, *AIR masses, *ATMOSPHERIC circulation
Abstract

Information about several topics discussed at the Canary Islands in one of its most curious carnivals, meteorologically speaking which was held in Spain on February 22 to 25, 2019. Topics discussed includes intrusion of Saharan dust, phenomenon of arrival of air masses from the African continent and types of atmospheric phenomena.

Published
2020

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