185 results on '"Backman, John"'
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2. Reply on RC1
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Backman, John, primary
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- 2024
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3. The Sensitivity of the Predictions of a Roadside Dispersion Model to Meteorological Variables: Evaluation Using Algorithmic Differentiation
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Backman, John, Wood, Curtis, Auvinen, Mikko, Kangas, Leena, Karppinen, Ari, Kukkonen, Jaakko, Mensink, Clemens, editor, and Kallos, George, editor
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- 2018
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4. Characteristics and source apportionment of black carbon in the Helsinki metropolitan area, Finland
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Helin, Aku, Niemi, Jarkko V., Virkkula, Aki, Pirjola, Liisa, Teinilä, Kimmo, Backman, John, Aurela, Minna, Saarikoski, Sanna, Rönkkö, Topi, Asmi, Eija, and Timonen, Hilkka
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- 2018
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5. How horizontal transport and turbulent mixing impacts aerosol particle and precursor concentrations at a background site in the UAE
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Kesti, Jutta, primary, O'Connor, Ewan James, additional, Hirsikko, Anne, additional, Backman, John, additional, Lihavainen, Heikki, additional, Korhonen, Hannele, additional, and Asmi, Eija, additional
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- 2023
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6. Styrning av vakuumpumpsystem i analyslaboratorie
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Backman, John
- Subjects
Datorsystem ,Computer Systems ,styrsystem - Abstract
Denna rapport presenterar ett projekt som syftar till att skapa en applikation med tillhörande hårdvara för att styra en vakuumpump i ett analyslaboratorie som ligger i anslutning till Bolidenägda Aitikgruvan i Gällivare. Vakuumpumpen används för att generera sugkraft till dragskåp, slangar och robotutrustning där giftiga ångor sugs bort när analyseringen av gråberg inträffar. Innan implementeringen av applikationen var pumphaverier ett faktum på grund av för lång tomgångskörning och Boliden beslutade därför att starta pump efter behov istället. Först skrevs en funktionsbeskrivning som vidare applicerades programmeringsmässigt i styrsystemet 800xA tillsammans med nödvändig hårdvara som exempelvis PAC, FRO och I/O-enheter. När applikationen innehöll samtliga funktioner testades den med en simulationscontroller som även kopplade samman applikation och konstruerad processbild. Efter felfri testkörning implementerades den essentiella hårdvaran för att genomföra ett slutgiltigt test på site med alla komponenter inkopplade. Detta test var framgångsrikt och en applikation enligt funktionsbeskrivning hade således konstruerats. Slutsatsen av arbetet är att det går att bygga en applikation för att styra en vakuumpump enligt kravspecifikationen med de applikationskomponenter som använts.
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- 2023
7. Carbon clusters in 50 nm urban air aerosol particles quantified by laser desorption–ionization aerosol mass spectrometer
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Laitinen, Totti, Petäjä, Tuukka, Backman, John, Hartonen, Kari, Junninen, Heikki, Ruiz-Jiménez, José, Worsnop, Douglas, Kulmala, Markku, and Riekkola, Marja-Liisa
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- 2014
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8. The Sensitivity of the Predictions of a Roadside Dispersion Model to Meteorological Variables: Evaluation Using Algorithmic Differentiation
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Backman, John, primary, Wood, Curtis, additional, Auvinen, Mikko, additional, Kangas, Leena, additional, Karppinen, Ari, additional, and Kukkonen, Jaakko, additional
- Published
- 2017
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9. Aerosol optical properties calculated from size distributions, filter samples and absorption photometer data at Dome C, Antarctica, and their relationships with seasonal cycles of sources
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Virkkula, Aki, primary, Grythe, Henrik, additional, Backman, John, additional, Petäjä, Tuukka, additional, Busetto, Maurizio, additional, Lanconelli, Christian, additional, Lupi, Angelo, additional, Becagli, Silvia, additional, Traversi, Rita, additional, Severi, Mirko, additional, Vitale, Vito, additional, Sheridan, Patrick, additional, and Andrews, Elisabeth, additional
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- 2022
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10. How horizontal transport and turbulent mixing impacts aerosol particle and precursor concentrations at a background site in the UAE.
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Kesti, Jutta, O’Connor, Ewan J., Hirsikko, Anne, Backman, John, Lihavainen, Heikki, Korhonen, Hannele, and Asmi, Eija
- Abstract
Abstract. Aerosol particle optical, physical and chemical properties have been previously studied in the United Arab Emirates (UAE), but there is still a gap in the knowledge of particle sources, and in the horizontal and vertical transport of aerosol particles and their precursors in the area. To investigate how aerosol particle and SO
2 concentrations at the surface responded to changes in horizontal and vertical transport, we used data from a one-year measurement campaign at a background site where local sources of SO2 where expected to be minimal. The measurement campaign provided a combination of in-situ measurements at the surface, and the boundary layer evolution from vertical and horizontal wind profiles measured by a Doppler lidar. The diurnal structure of the boundary layer in the UAE was very similar from day to day, with deep well-mixed boundary layer during the day transitioning to a shallow nocturnal layer, with the maximum boundary layer height usually being reached around 1400 local time. Both SO2 and nucleation mode aerosol particle concentrations were elevated for surface winds coming from the east or western sectors.We attribute this to oil refineries located on the eastern and western coasts of the UAE. The concentrations of larger cloud condensation nuclei (CCN) sized particles and their activation fraction did not show any clear dependence on wind direction, but the CCN number concentration showed some dependence on wind speed, with higher concentrations coinciding with the weakest surface winds. Peaks in SO2 concentrations were also observed despite low surface wind speeds and wind directions unfavourable for transport. However, winds aloft were much stronger, with wind speeds of 10 m s−1 at 1 km common at night, and with wind directions favourable for transport, and surface-measured concentrations increased rapidly once these particular layers started to be entrained into the growing boundary layer, even if the surface wind direction was from a clean sector. These conditions also displayed higher nucleation mode aerosol particle concentrations, i.e. new particle formation events occurring due to the increase in the gaseous precursor. [ABSTRACT FROM AUTHOR]- Published
- 2023
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11. Aerosol particle characteristics measured in the United Arab Emirates and their response to mixing in the boundary layer
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Kesti, Jutta, primary, Backman, John, additional, O'Connor, Ewan J., additional, Hirsikko, Anne, additional, Asmi, Eija, additional, Aurela, Minna, additional, Makkonen, Ulla, additional, Filioglou, Maria, additional, Komppula, Mika, additional, Korhonen, Hannele, additional, and Lihavainen, Heikki, additional
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- 2022
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12. Estimates of mass absorption cross sections of black carbon for filter-based absorption photometers in the Arctic
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Ohata, Sho, primary, Mori, Tatsuhiro, additional, Kondo, Yutaka, additional, Sharma, Sangeeta, additional, Hyvärinen, Antti, additional, Andrews, Elisabeth, additional, Tunved, Peter, additional, Asmi, Eija, additional, Backman, John, additional, Servomaa, Henri, additional, Veber, Daniel, additional, Eleftheriadis, Konstantinos, additional, Vratolis, Stergios, additional, Krejci, Radovan, additional, Zieger, Paul, additional, Koike, Makoto, additional, Kanaya, Yugo, additional, Yoshida, Atsushi, additional, Moteki, Nobuhiro, additional, Zhao, Yongjing, additional, Tobo, Yutaka, additional, Matsushita, Junji, additional, and Oshima, Naga, additional
- Published
- 2021
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13. Aerosol optical properties calculated from size distributions, filter samples and absorption photometer data at Dome C, Antarctica and their relationships between seasonal cycles of sources
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Virkkula, Aki, primary, Grythe, Henrik, additional, Backman, John, additional, Petäjä, Tuukka, additional, Busetto, Maurizio, additional, Lanconelli, Christian, additional, Lupi, Angelo, additional, Becagli, Silvia, additional, Traversi, Rita, additional, Severi, Mirko, additional, Vitale, Vito, additional, Sheridan, Patrick, additional, and Andrews, Elisabeth, additional
- Published
- 2021
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14. Absorption instruments inter-comparison campaign at the Arctic Pallas station
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Asmi, Eija, primary, Backman, John, additional, Servomaa, Henri, additional, Virkkula, Aki, additional, Gini, Maria I., additional, Eleftheriadis, Konstantinos, additional, Müller, Thomas, additional, Ohata, Sho, additional, Kondo, Yutaka, additional, and Hyvärinen, Antti, additional
- Published
- 2021
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15. Supplementary material to "Aerosol optical properties calculated from size distributions, filter samples and absorption photometer data at Dome C, Antarctica and their relationships between seasonal cycles of sources"
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Virkkula, Aki, primary, Grythe, Henrik, additional, Backman, John, additional, Petäjä, Tuukka, additional, Busetto, Maurizio, additional, Lanconelli, Christian, additional, Lupi, Angelo, additional, Becagli, Silvia, additional, Traversi, Rita, additional, Severi, Mirko, additional, Vitale, Vito, additional, Sheridan, Patrick, additional, and Andrews, Elisabeth, additional
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- 2021
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16. Supplementary material to "Estimates of mass absorption cross sections of black carbon for filter-based absorption photometers in the Arctic"
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Ohata, Sho, primary, Mori, Tatsuhiro, additional, Kondo, Yutaka, additional, Sharma, Sangeeta, additional, Hyvärinen, Antti, additional, Andrews, Elisabeth, additional, Tunved, Peter, additional, Asmi, Eija, additional, Backman, John, additional, Servomaa, Henri, additional, Veber, Daniel, additional, Eleftheriadis, Konstantinos, additional, Vratolis, Stergios, additional, Koike, Makoto, additional, Kanaya, Yugo, additional, Yoshida, Atsushi, additional, Moteki, Nobuhiro, additional, Zhao, Yongjing, additional, Tobo, Yutaka, additional, Matsushita, Junji, additional, and Oshima, Naga, additional
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- 2021
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17. Aerosol particle characteristics measured in the United Arab Emirates and their response to mixing in the boundary layer
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Kesti, Jutta, primary, Backman, John, additional, O'Connor, Ewan James, additional, Hirsikko, Anne, additional, Asmi, Eija, additional, Aurela, Minna, additional, Makkonen, Ulla, additional, Filioglou, Maria, additional, Komppula, Mika, additional, Korhonen, Hannele, additional, and Lihavainen, Heikki, additional
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- 2021
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18. Changes in black carbon emissions over Europe due to COVID-19 lockdowns
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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
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- 2021
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19. Estimates of mass absorption cross sections of black carbon for filter-based absorption photometers in the Arctic
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Ohata, Sho, primary, Mori, Tatsuhiro, additional, Kondo, Yutaka, additional, Sharma, Sangeeta, additional, Hyvärinen, Antti, additional, Andrews, Elisabeth, additional, Tunved, Peter, additional, Asmi, Eija, additional, Backman, John, additional, Servomaa, Henri, additional, Veber, Daniel, additional, Koike, Makoto, additional, Kanaya, Yugo, additional, Yoshida, Atsushi, additional, Moteki, Nobuhiro, additional, Zhao, Yongjing, additional, Matsushita, Junji, additional, and Oshima, Naga, additional
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- 2020
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20. Characterizing the Arctic absorbing aerosol with multi-instrument observations
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Asmi, Eija, primary, Backman, John, additional, Servomaa, Henri, additional, Virkkula, Aki, additional, Gini, Maria, additional, Eleftheriadis, Kostas, additional, Müller, Thomas, additional, Ohata, Sho, additional, Kondo, Yutaka, additional, and Hyvärinen, Antti, additional
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- 2020
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21. Supplementary material to "Changes in black carbon emissions over Europe due to COVID-19 lockdowns"
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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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22. Changes in black carbon emissions over Europe due to COVID-19 lockdowns
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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
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- 2020
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23. A global analysis of climate-relevant aerosol properties retrieved from the network of Global Atmosphere Watch (GAW) near-surface observatories
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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
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- 2020
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24. Optical and geometrical aerosol particle properties over the United Arab Emirates
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Filioglou, Maria, primary, Giannakaki, Elina, additional, Backman, John, additional, Kesti, Jutta, additional, Hirsikko, Anne, additional, Engelmann, Ronny, additional, O'Connor, Ewan, additional, Leskinen, Jari T. T., additional, Shang, Xiaoxia, additional, Korhonen, Hannele, additional, Lihavainen, Heikki, additional, Romakkaniemi, Sami, additional, and Komppula, Mika, additional
- Published
- 2020
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25. Multidecadal trend analysis of in situ aerosol radiative properties around the world
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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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26. Supplementary material to "A global analysis of climate-relevant aerosol properties retrieved from the network of GAW near-surface observatories"
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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
- Full Text
- View/download PDF
27. A global analysis of climate-relevant aerosol properties retrieved from the network of GAW near-surface observatories
- Author
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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
- Full Text
- View/download PDF
28. Multidecadal trend analysis of aerosol radiative properties at a global scale
- Author
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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
- Full Text
- View/download PDF
29. Supplementary material to "Multidecadal trend analysis of aerosol radiative properties at a global scale"
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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
- Full Text
- View/download PDF
30. Changes in aerosol size distributions over the Indian Ocean during different meteorological conditions
- Author
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Kesti, Jutta, primary, Asmi, Eija, additional, O’Connor, Ewan J., additional, Backman, John, additional, Budhavant, Krishnakant, additional, Andersson, August, additional, Dasari, Sanjeev, additional, Praveen, Puppala S., additional, Zahid, H., additional, and Gustafsson, Örjan, additional
- Published
- 2020
- Full Text
- View/download PDF
31. Photochemical degradation affects the light absorption of water-soluble brown carbon in the South Asian outflow
- Author
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Dasari, Sanjeev, Andersson, August, Bikkina, Srinivas, Holmstrand, Henry, Budhavant, Krishnakant, Satheesh, Sreedharan, Asmi, Eija, Kesti, Jutta, Backman, John, Salam, Abdus, Bisht, Deewan Singh, Tiwari, Suresh, Hameed, Zahid, and Gustafsson, Orjan
- Subjects
Divecha Centre for Climate Change ,Centre for Atmospheric & Oceanic Sciences - Abstract
Light-absorbing organic aerosols, known as brown carbon (BrC), counteract the overall cooling effect of aerosols on Earth's climate. The spatial and temporal dynamics of their light-absorbing properties are poorly constrained and unaccounted for in climate models, because of limited ambient observations. We combine carbon isotope forensics (delta C-13) with measurements of light absorption in a conceptual aging model to constrain the loss of light absorptivity (i.e., bleaching) of water-soluble BrC (WS-BrC) aerosols in one of the world's largest BrC emission regions-South Asia. On this regional scale, we find that atmospheric photochemical oxidation reduces the light absorption of WS-BrC by similar to 84% during transport over 6000 km in the Indo-Gangetic Plain, with an ambient first-order bleaching rate of 0.20 +/- 0.05 day(-1) during over-ocean transit across Bay of Bengal to an Indian Ocean receptor site. This study facilitates dynamic parameterization of WS-BrC absorption properties, thereby constraining BrC climate impact over South Asia.
- Published
- 2019
32. Beyond silos: cross-boundary Internet service portals
- Author
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Backman, John
- Subjects
Administrative agencies -- Customer relations -- Usage ,Internet service providers -- Usage -- Influence -- Customer relations ,Web portals -- Usage -- Influence ,Banking, finance and accounting industries ,Business ,Government ,Web portal ,Internet service provider ,Influence ,Usage ,Customer relations - Abstract
The Internet has the potential to transform municipal services and dramatically improve customer service--particularly if government agencies and departments are willing to look beyond traditional, 'silo'-based service-delivery models. Unless we [...]
- Published
- 2008
33. Aerosol optical properties calculated from size distributions, filter samples and absorption photometer data at Dome C, Antarctica and their relationships between seasonal cycles of sources.
- Author
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Virkkula, Aki, Grythe, Henrik, Backman, John, Petäjä, Tuukka, Busetto, Maurizio, Lanconelli, Christian, Lupi, Angelo, Becagli, Silvia, Traversi, Rita, Severi, Mirko, Vitale, Vito, Sheridan, Patrick, and Andrews, Elisabeth
- Abstract
Optical properties of surface aerosols at Dome C, Antarctica in 2007-2013 and their potential source areas are presented. Scattering coefficients (s
sp ) were calculated from measured particle number size distributions with a Mie code and from filter samples using mass scattering efficiencies. Absorption coefficients (sap ) were determined with a 3-wavelength Particle Soot Absorption Photometer (PSAP) and corrected for scattering by using two different algorithms. The scattering coefficients were also compared with ssp measured with a nephelometer at the South Pole Station (SPO). The minimum sap was observed in the austral autumn and the maximum in the austral spring, similar to other Antarctic sites. The darkest aerosol, i.e., the lowest single scattering albedo ?o ˜ 0.91 was observed in September and October and the highest ?o ˜ 0.99 in February and March. The uncertainty of the absorption Ångström exponent aap is high. The lowest aap monthly medians were observed in March and the highest in August – October. The equivalent black carbon (eBC) mass concentrations were compared with eBC measured at three other Antarctic sites: the SPO and two coastal sites, Neumayer and Syowa. The maximum monthly median eBC concentrations are almost the same (~3 ± 1 ng m-3 ) at all these sites in October-November. This suggests that there is no significant difference in eBC between the coastal and plateau sites. The seasonal cycle of the eBC mass fraction exhibits a minimum f(eBC) ˜ 0.1% in February-March and a maximum ~4-5% in August-October. Source areas were calculated using 50-day FLEXPART footprints. The highest eBC concentrations and the lowest ?o were associated with air masses coming from South America, Australia and Africa. Vertical simulations that take BC particle removal processes into account show that there would be essentially no BC particles arriving at Dome C from north of latitude 10°S at altitudes < 1600 m. The main biomass-burning regions Africa, Australia and Brazil are more to the south and their smoke plumes have been observed at higher altitudes than that so they can get transported to Antarctica. The seasonal cycle of BC emissions from wildfires and agricultural burning and other fires in South America, Africa and Australia were calculated from data downloaded from the Global Fire Emissions Database (GFED). The maximum total emissions were in August-September but the peak of monthly average eBC concentrations is observed 2 – 3 months later in November not only at Dome C but also at SPO and the coastal stations. The air mass residence-time-weighted BC emissions from South America are approximately an order of magnitude larger than from Africa and Oceania suggesting that South American BC emissions are the largest contributors to eBC at Dome C. At Dome C the maximum and minimum scattering coefficients were observed in austral summer and winter, respectively. At SPO ssp was similar to that observed at Dome C in the austral summer but there was a large difference in winter, suggesting that in winter SPO is more influenced by sea spray emissions than Dome C. The seasonal cycles of ssp at Dome C and at the SPO were compared with the seasonal cycles of secondary and primary marine aerosol emissions. The ssp measured at SPO correlated much better with the sea-spray aerosol emission fluxes in the Southern Ocean than ssp at Dome C. The seasonal cycles of biogenic secondary aerosols were estimated from monthly average phytoplankton biomass concentrations obtained from the CALIOP satellite sensor data. The analysis suggests that a large fraction of the biogenic scattering aerosol observed at Dome C has been formed in the polar zone but it may take a month for the aerosol to be formed, grown and get transported from the sea level to Dome C. [ABSTRACT FROM AUTHOR]- Published
- 2021
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- View/download PDF
34. Morrison and Advent
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Backman, John
- Subjects
Philosophy ,Philosophy and religion - Abstract
I've read quite a few articles about Toni Morrison in the months after her passing, and 'The strange stuff;' by Stephanie Paul-sell (Dec. 18), comes the closest to expressing what [...]
- Published
- 2020
35. Total depravity
- Author
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Godfrey, Michael, VanRees, K.D., and Backman, John
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Faith ,Philosophy and religion - Abstract
Despite being an ardent universalist. I find 'total depravity,' as described by Heidi Haverkamp ('Thoroughly sinful,' Oct. 9), to be a powerful key by which to interpret a fallen, stumbling, [...]
- Published
- 2019
36. Aerosol particle characteristics measured in the United Arab Emirates and their response to mixing in the boundary layer.
- Author
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Kesti, Jutta, Backman, John, O'Connor, Ewan J., Hirsikko, Anne, Asmi, Eija, Aurela, Minna, Makkonen, Ulla, Filioglou, Maria, Komppula, Mika, Korhonen, Hannele, and Lihavainen, Heikki
- Abstract
Aerosol particles play an important in role in the microphysics of clouds and hence on their likelihood to precipitate. In the changing climate already dry areas such as the United Arab Emirates (UAE) are predicted to become even drier. Comprehensive observations of the daily and seasonal variation in aerosol particle properties in such locations are required reducing the uncertainty in such predictions. We analyse observations from a one-year measurement campaign at a background location in the United Arab Emirates to investigate the properties of aerosol particles in this region, study the impact of boundary layer mixing on background aerosol particle properties measured at the surface and study the temporal evolution of the aerosol particle cloud formation potential in the region. We used in-situ aerosol particle measurements to characterise the aerosol particle composition, size, number and cloud condensation nuclei (CCN) properties, in-situ SO
2 measurements as an anthropogenic signature and a long-range scanning Doppler lidar to provide vertical profiles of the horizontal wind and turbulent properties to monitor the evolution of the boundary layer. Anthropogenic sulphate dominated the aerosol particle mass composition in this location. There was a clear diurnal cycle in the surface wind direction, which had a strong impact on aerosol particle total number concentration, SO2 concentration and black carbon mass concentration. Local sources were the predominant source of black carbon, as concentrations clearly depended on the presence of turbulent mixing, with much higher values during calm nights. The measured concentrations of SO2 , instead, were highly dependent on the surface wind direction as well as on the depth of the boundary layer when entrainment from the advected elevated layers occurred. The wind direction at the surface or of the elevated layer suggests that the cities of Dubai, Abu Dhabi and other coastal conurbations were the remote sources of SO2 . We observed new aerosol particle formation events almost every day (on four days out of five on average). Calm nights had the highest CCN number concentrations and lowest κ values and activation fractions. We did not observe any clear dependence of CCN number concentration and κ parameter on the height of the daytime boundary layer, whereas the activation fraction did show a slight increase with increasing boundary layer height, due to the change in the shape of the aerosol particle size distribution where the relative portion of larger aerosol particles increased with increasing boundary layer height. We believe that this indicates that size is more important than chemistry for aerosol particle CCN activation at this site. The combination of instrumentation used in this campaign enabled us to identify periods when anthropogenic pollution from remote sources that had been transported in elevated layers was present, and had been mixed down to the surface in the growing boundary layer. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
37. Ground-based observation of clusters and nucleation-mode particles in the Amazon
- Author
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FISCHBECK, Garlich, BÖNISCH, Harald, NEUMAIER, Marco, BRENNINKMEIJER, Carl, ORPHAL, Johannes, BECKER, Julia, SPRUNG, Detlev, VAN VELTHOVEN, Peter, ZAHN, Andreas, WIMMER, Daniela, BUENROSTRO MAZON, Stephany, MANNINEN, Hanna Elina, KANGASLUOMA, Juha, FRANCHIN, Alessandro, NIEMINEN, Tuomo, BACKMAN, John, WANG, Jian, KUANG, Chongai, KREJCI, Radovan, BRITO, Joel, GONCALVES MORAIS, Fernando, MARTIN, Scot Turnbull, ARTAXO, Paulo, KULMALA, Markku, KERMINEN, Veli-Matti, PETÄJÄ, Tuukka, Department of Physics, University of Helsinki, University of Eastern Finland, FORD, Dearborn, Michigan, USA, parent, Department of Environmental Science and Analytical Chemistry [Stockholm] (ACES), Stockholm University, Centre for Energy and Environment (CERI EE), Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institute for Atmospheric and Environmental Sciences [Frankfurt/Main] (IAU), Goethe-University Frankfurt am Main, Max Planck Institute for Chemistry (MPIC), Max-Planck-Gesellschaft, Institute for Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT), Royal Netherlands Meteorological Institute (KNMI), Department Biologie II, Ludwig-Maximilians-Universität München (LMU), Laboratoire de Météorologie Physique (LaMP), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Centre for Energy and Environment (CERI EE - IMT Nord Europe), and Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Nord Europe)
- Subjects
Pollution ,Wet season ,Atmospheric Science ,010504 meteorology & atmospheric sciences ,FORMATION EVENTS ,media_common.quotation_subject ,[SDE.MCG]Environmental Sciences/Global Changes ,Rainforest ,INTERMEDIATE IONS ,010501 environmental sciences ,Atmospheric sciences ,01 natural sciences ,114 Physical sciences ,lcsh:Chemistry ,BOREAL FOREST ,ATMOSPHERIC NUCLEATION ,Dry season ,SIZE DISTRIBUTION ,0105 earth and related environmental sciences ,media_common ,[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere ,[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] ,GROWTH-RATES ,Amazon rainforest ,BOUNDARY-LAYER ,15. Life on land ,lcsh:QC1-999 ,Aerosol ,Trace gas ,Plume ,lcsh:QD1-999 ,13. Climate action ,Environmental science ,AEROSOL-PARTICLES ,NEUTRAL CLUSTER ,lcsh:Physics ,AIR ION SPECTROMETER - Abstract
We investigated atmospheric new particle formation (NPF) in the Amazon rainforest using direct measurement methods. To our knowledge this is the first direct observation of NPF events in the Amazon region. However, previous observations elsewhere in Brazil showed the occurrence of nucleation-mode particles. Our measurements covered two field sites and both the wet and dry season. We measured the variability of air ion concentrations (0.8–12 nm) with an ion spectrometer between September 2011 and January 2014 at a rainforest site (T0t). Between February and October 2014, the same measurements were performed at a grassland pasture site (T3) as part of the GoAmazon 2014/5 experiment, with two intensive operating periods (IOP1 and IOP2 during the wet and the dry season, respectively). The GoAmazon 2014/5 experiment was designed to study the influence of anthropogenic emissions on the changing climate in the Amazon region. The experiment included basic aerosol and trace gas measurements at the ground, remote sensing instrumentation, and two aircraft-based measurements. The results presented in this work are from measurements performed at ground level at both sites. The site inside the rainforest (T0t) is located 60 km NNW of Manaus and influenced by pollution about once per week. The pasture (T3) site is located 70 km downwind from Manaus and influenced by the Manaus pollution plume typically once per day or every second day, especially in the afternoon. No NPF events were observed inside the rainforest (site T0t) at ground level during the measurement period. However, rain-induced ion and particle bursts (hereafter, “rain events”) occurred frequently (643 of 1031 days) at both sites during the wet and dry season, being most frequent during the wet season. During the rain events, the ion concentrations in three size ranges (0.8–2, 2–4, and 4–12 nm) increased up to about 104–105 cm−3. This effect was most pronounced in the intermediate and large size ranges, for which the background ion concentrations were about 10–15 cm−3 compared with 700 cm−3 for the cluster ion background. We observed eight NPF events at the pasture site during the wet season. We calculated the growth rates and formation rates of neutral particles and ions for the size ranges 2–3 and 3–7 nm using the ion spectrometer data. The observed median growth rates were 0.8 and 1.6 nm h−1 for 2–3 nm sized ions and particles, respectively, with larger growth rates (13.3 and 7.9 nm h−1) in the 3–7 nm size range. The measured nucleation rates were of the order of 0.2 cm−3 s−1 for particles and 4–9×10-3 cm−3 s−1 for ions. There was no clear difference in the sulfuric acid concentrations between the NPF event days and nonevent days (∼9×105 cm−3). The two major differences between the NPF days and nonevent days were a factor of 1.8 lower condensation sink on NPF event days (1.8×10-3 s−1) compared to nonevents (3.2×10-3 s−1) and different air mass origins. To our knowledge, this is the first time that results from ground-based sub-3 nm aerosol particle measurements have been obtained from the Amazon rainforest.
- Published
- 2018
38. The importance of the representation of air pollution emissions for the modeled distribution and radiative effects of black carbon in the Arctic
- Author
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Schacht, Jacob, primary, Heinold, Bernd, additional, Quaas, Johannes, additional, Backman, John, additional, Cherian, Ribu, additional, Ehrlich, Andre, additional, Herber, Andreas, additional, Huang, Wan Ting Katty, additional, Kondo, Yutaka, additional, Massling, Andreas, additional, Sinha, P. R., additional, Weinzierl, Bernadett, additional, Zanatta, Marco, additional, and Tegen, Ina, additional
- Published
- 2019
- Full Text
- View/download PDF
39. Photochemical degradation affects the light absorption of water-soluble brown carbon in the South Asian outflow
- Author
-
Dasari, Sanjeev, primary, Andersson, August, additional, Bikkina, Srinivas, additional, Holmstrand, Henry, additional, Budhavant, Krishnakant, additional, Satheesh, Sreedharan, additional, Asmi, Eija, additional, Kesti, Jutta, additional, Backman, John, additional, Salam, Abdus, additional, Bisht, Deewan Singh, additional, Tiwari, Suresh, additional, Hameed, Zahid, additional, and Gustafsson, Örjan, additional
- Published
- 2019
- Full Text
- View/download PDF
40. Estimates of mass absorption cross sections of black carbon for filter-based absorption photometers in the Arctic.
- Author
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Sho Ohata, Tatsuhiro Mori, Yutaka Kondo, Sharma, Sangeeta, Antti Hyvärinen, Andrews, Elisabeth, Tunved, Peter, Asmi, Eija, Backman, John, Servomaa, Henri, Veber, Daniel, Makoto Koike, Yugo Kanaya, Atsushi Yoshida, Nobuhiro Moteki, Yongjing Zhao, Junji Matsushita, and Naga Oshima
- Abstract
Long-term measurements of black carbon (BC) are warranted for investigating changes in its emission, transport, and deposition. However, depending on instrumentation, parameters related to BC such as aerosol absorption coefficient (b
abs ) have been measured instead. Most ground-based measurements of babs in the Arctic have been made by filter-based absorption photometers, including multi-angle absorption photometers (MAAP), particle soot absorption photometers (PSAP), continuous light absorption photometer (CLAP), and Aethalometers. The measured babs can be converted to atmospheric mass concentrations of BC (MBC ) by assuming the value of the mass absorption cross section (MAC = babs /MBC ). However, the accuracy of conversion of babs to MBC has not been adequately assessed. Here, we introduce a systematic method for deriving MAC values from babs measured by these instruments and independently measured MBC . In this method, MBC was measured with a filter-based absorption photometer with a heated inlet (COSMOS). COSMOS- derived MBC (MBC (COSMOS)) is traceable to a rigorously calibrated single particle soot photometer (SP2) and the absolute accuracy of MBC (COSMOS) has been demonstrated previously to be about 15 % in Asia and the Arctic. The necessary conditions for application of this method are a high correlation of the measured babs with independently measured MBC , and long-term stability of the correlation slope, which represents the MAC. In general, babs - MBC (COSMOS) correlations were high (r² = 0.84-0.96 for hourly data) at Fukue in Japan, Barrow in Alaska, Ny-Ålesund in Svalbard, Pallastunturi in Finland, and Alert in Canada, and stable up to for 10 years. We successfully estimated MAC values (11.0-15.2 m² g-1 at a wavelength of 550 nm) for these instruments and these MAC values can be used to obtain error-constrained estimates of MBC from babs measured at these sites even in the past, when COSMOS measurements were not made. Because the absolute values of MBC in these Arctic sites estimated by this method are consistent with each other, they are applicable to study spatial and temporal variation of MBC and to evaluate performance of numerical model calculations. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
41. Characterizing the Arctic absorbing aerosol with multi-instrument observations.
- Author
-
Asmi, Eija, Backman, John, Servomaa, Henri, Virkkula, Aki, Gini, Maria, Eleftheriadis, Kostas, Müller, Thomas, Sho Ohata, Yutaka Kondo, and Hyvärinen, Antti
- Subjects
- *
AEROSOLS , *ABSORPTION coefficients , *GLOBAL warming , *AIR masses , *AIR flow , *CARBONACEOUS aerosols - Abstract
The Arctic absorbing aerosols have a high potential to accelerate global warming. Accurate and sensitive measurements of their concentrations, variability and atmospheric mixing are needed. Filter-based aerosol light absorption measurement methods are the most widely applied in the Arctic. Those will be the focus of this study. Aerosol light absorption was measured during one month field campaign in June–July 2019 at the Pallas Global AtmosphericWatch (GAW) station in northern Finland. The campaign provided a real-world test for different absorption measurement techniques supporting the goals of the EMPIR BC metrology project in developing aerosol absorption standard and reference methods. Very low aerosol concentrations prevailed during the campaign which imposed a challenge for the instruments detection. In this study we compare the results from five filter-based absorption techniques: Aethalometer models AE31 and AE33, Particle Soot Absorption Photometer (PSAP), Multi Angle Absorption Photometer (MAAP) and Continuous Soot Monitoring System (COSMOS), and from one indirect method called Extinction Minus Scattering (EMS). The sensitivity of the filter-based techniques was adequate to measure aerosol light absorption coefficients down to around 0.05 Mm-1 levels. The average value measured during the campaign using MAAP was 0.09 Mm-1 (at wavelength of 637 nm). When data were averaged for >1h, an agreement of around 20% was obtained between instruments. COSMOS measured systematically the lowest absorption coefficient values, which was expected due to the sample pre-treatment in COSMOS inlet. PSAP showed the best linear correlation with MAAP (R2 = 0.85), followed by AE33 and COSMOS (R2 = 0.84). The noisy data from AE31 resulted in a slightly lower, yet a significant, correlation with MAAP (R2 = 0.46). In contrast to the filter-based techniques, the sensitivity of the indirect EMS method to measure aerosol absorption was not adequate at such low concentrations levels. An absorption coefficient on the order of >1 Mm-1 was estimated as the lowest limit, to reliably distinguish the signal from the noise. Throughout the campaign the aerosol was highly scattering with an average single-scattering albedo of 0.97. Two different air-mass origins could be identified: the north-east and from the north-west. The north-eastern air masses contained higher fraction of thickly coated light absorbing particles than the westerly air masses. Aerosol scattering, absorption and the particle coating thickness increased on the last ten days of the campaign during the north-eastern air flow. The simultaneous changes in aerosol source region, mixing state, concentration and particle optical size were reflected in the instruments' response in a complex way. The observed decrease in aerosol size suggested additional activation of secondary particle formation mechanisms. The results demonstrate the challenges encountered in the Arctic absorbing aerosol measurements. The applicability and uncertainties of different techniques are discussed and new knowledge on the absorbing aerosol characteristics in summer Arctic air masses reference to the source region is provided. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
42. 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
- Full Text
- View/download PDF
43. A European aerosol phenomenology-6: Scattering properties of atmospheric aerosol particles from 28 ACTRIS sites [Discussion paper]
- Author
-
Pandolfi, Marco, Alados Arboledas, Lucas, Alastuey, Andrés, Andrade, Marcos, Artíñano, Begoña, Backman, John, Baltensperger, Urs, Bonasoni, Paolo, Bukowiecki, Nicolas, Collaud Coen, Martine, Conil, Sebastian, Coz, Esther, Crenn, Vincent, Dudoitis, Vadimas, Ealo, Marina, Eleftheriadis, Konstantinos, Favez, Olivier, Fetfatzis, Prodromos, Fiebig, Markus, Flentje, Harald, Ginot, Patrick, Gysel-Beer, Martin, Henzing, Bas, Hoffer, Andras, Holubova, Andela, Kalapov, Ivo, Kalivitis, Nikos, Kouvarakis, Giorgos, Kristensson, Adam, Kulmala, Markku, Lihavainen, Heikki, Lunder, Chris, Luoma, Krista, Lyamani, Hassan, Marinoni, Angela, Mihalopoulos, Nikos, Moerman, Marcel, Nicolas, José, O'Dowd, Colin, Petäjä, Tuukka, Petit, Jean-Eudes, Pichon, Jean Marc, Prokopciuk, Nina, Putaud, Jean-Philippe, Rodríguez González, Sergio, Sciare, Jean, Sellegri, Karine, Stamenov, Dimiter B., Swietlicki, Erik, Titos, Gloria, Tuch, Thomas, Tunved, Peter, Ulevicius, Vidmantas, Vaishya, Aditya, Vana, Milan, Virkkula, Aki, Vratolis, Stergios, Weingartner, Ernest, Wiedensohler, Alfred, and Laj, Paolo
- Subjects
Aerosol particle ,Mass concentrations ,Phenomenology ,Particle light scattering ,Atmospheric aerosol ,Scattering properties - Abstract
This investigation presents the variability of near-surface in-situ aerosol particle light scattering measurements obtained over the past decade at 28 measuring atmospheric observatories which are part of the ACTRIS Research Infrastructure and most of them belong to the GAW network. This manuscript provides a comprehensive picture of the spatial and temporal variability of aerosol particles optical properties in Europe. This project has received funding from the European Union’s Horizon 2020 research and 11 innovation programme under grant agreement No 654109, ACTRIS (project No. 262254), ACTRIS12 PPP (project No 739530).MAD station is co-financed by the PROACLIM ( CGL2014-52877-R) project. SMR station acknowledges BACCHUS (project No. 603445), CRAICC (project No. 26060) and Academy of Finland (project No. 3073314). UGR station is co-financed by the Spanish Ministry of Economy and Competitiveness through project CGL2016-81092-R. Measurements at Montseny and Montsec stations were supported by the MINECO (Spanish Ministry of Economy and Competitiveness) and FEDER funds under the PRISMA project (CGL2012-39623-C02/00), by the MAGRAMA (Spanish Ministry of Agriculture, Food and Environment) and by the Generalitat de Catalunya (AGAUR 2014 SGR33 and the DGQA). Measurements at Izaña were supported by AEROATLAN project (CGL2015-17 66229-P), co-funded by the Ministry of Economy and Competitiveness of Spain and the European Regional Development Fund. Station Košetice is supported by Ministry of Education, Youth and Sports of the Czech Republic within project for support of national research infrastructure ACTRIS – participation of the Czech Republic (ACTRIS-CZ – LM2015037). Measurements at Puy de Dôme were partly supported by CNRS-INSU, University Clermont- Auvergne, OPGC and the french CLAP program. PAL station acknowledges KONE Foundation, Academy of Finland (project No. 269095 and No. 296302). CHC station received support from Institut de Recherche pour le Développement (IRD) under both Jeune Equipe program attributed to LFA and support to ACTRIS-FR program. CHC received grants from Labex OSUG@2020 (Investissements d’avenir – ANR10 LABX56). Marco Pandolfi is funded by a Ramón y Cajal Fellowship (RYC-2013-14036) awarded by the Spanish Ministry of Economy and Competitiveness.
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- 2017
44. Multidecadal trend analysis of aerosol radiative properties at a global scale.
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Coen, Martine Collaud, Andrews, Elisabeth, Alastuey, Andrés, Arsov, Todor Petkov, Backman, John, Brem, Benjamin T., Bukowiecki, Nicolas, Couret, Cédric, Eleftheriadis, Konstantinos, Flentje, Harald, Fiebig, Markus, Gysel-Beer, Martin, Hand, Jenny L., Hoffer, András, Hooda, Rakesh, Hueglin, Christoph, Joubert, Warren, Keywood, Melita, Jeong Eun Kim, and Sang-Woo Kim
- 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) for polar stations and Mauna Loa. For most of the stations, the present-day statistically significant decreasing 10 year trends of the single scattering albedo were preceded by not statistically significant and statistically significant increasing 10 year trends. The effect of air pollution abatement policies in continental North America is very obvious in the 10 year trends of the scattering coefficient - there is a shift to statistically significant negative trends in 2010-2011 for all stations in the eastern and central US. This long-term trend analysis of aerosol radiative properties with a broad spatial coverage enables a better global view of potential aerosol effects on climate changes. [ABSTRACT FROM AUTHOR]
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- 2020
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45. Ground-based observation of clusters and nucleation-mode particles in the Amazon
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Wimmer, Daniela, primary, Buenrostro Mazon, Stephany, additional, Manninen, Hanna Elina, additional, Kangasluoma, Juha, additional, Franchin, Alessandro, additional, Nieminen, Tuomo, additional, Backman, John, additional, Wang, Jian, additional, Kuang, Chongai, additional, Krejci, Radovan, additional, Brito, Joel, additional, Goncalves Morais, Fernando, additional, Martin, Scot Turnbull, additional, Artaxo, Paulo, additional, Kulmala, Markku, additional, Kerminen, Veli-Matti, additional, and Petäjä, Tuukka, additional
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- 2018
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46. Seasonality of aerosol optical properties in the Arctic
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Schmeisser, Lauren, primary, Backman, John, additional, Ogren, John A., additional, Andrews, Elisabeth, additional, Asmi, Eija, additional, Starkweather, Sandra, additional, Uttal, Taneil, additional, Fiebig, Markus, additional, Sharma, Sangeeta, additional, Eleftheriadis, Kostas, additional, Vratolis, Stergios, additional, Bergin, Michael, additional, Tunved, Peter, additional, and Jefferson, Anne, additional
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- 2018
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47. Multi-year statistical and modeling analysis of submicrometer aerosol number size distributions at a rain forest site in Amazonia
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Varanda Rizzo, Luciana, primary, Roldin, Pontus, additional, Brito, Joel, additional, Backman, John, additional, Swietlicki, Erik, additional, Krejci, Radovan, additional, Tunved, Peter, additional, Petäjä, Tukka, additional, Kulmala, Markku, additional, and Artaxo, Paulo, additional
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- 2018
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48. A European aerosol phenomenology – 6: scattering properties of atmospheric aerosol particles from 28 ACTRIS sites
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Pandolfi, Marco, primary, Alados-Arboledas, Lucas, additional, Alastuey, Andrés, additional, Andrade, Marcos, additional, Angelov, Christo, additional, Artiñano, Begoña, additional, Backman, John, additional, Baltensperger, Urs, additional, Bonasoni, Paolo, additional, Bukowiecki, Nicolas, additional, Collaud Coen, Martine, additional, Conil, Sébastien, additional, Coz, Esther, additional, Crenn, Vincent, additional, Dudoitis, Vadimas, additional, Ealo, Marina, additional, Eleftheriadis, Kostas, additional, Favez, Olivier, additional, Fetfatzis, Prodromos, additional, Fiebig, Markus, additional, Flentje, Harald, additional, Ginot, Patrick, additional, Gysel, Martin, additional, Henzing, Bas, additional, Hoffer, Andras, additional, Holubova Smejkalova, Adela, additional, Kalapov, Ivo, additional, Kalivitis, Nikos, additional, Kouvarakis, Giorgos, additional, Kristensson, Adam, additional, Kulmala, Markku, additional, Lihavainen, Heikki, additional, Lunder, Chris, additional, Luoma, Krista, additional, Lyamani, Hassan, additional, Marinoni, Angela, additional, Mihalopoulos, Nikos, additional, Moerman, Marcel, additional, Nicolas, José, additional, O'Dowd, Colin, additional, Petäjä, Tuukka, additional, Petit, Jean-Eudes, additional, Pichon, Jean Marc, additional, Prokopciuk, Nina, additional, Putaud, Jean-Philippe, additional, Rodríguez, Sergio, additional, Sciare, Jean, additional, Sellegri, Karine, additional, Swietlicki, Erik, additional, Titos, Gloria, additional, Tuch, Thomas, additional, Tunved, Peter, additional, Ulevicius, Vidmantas, additional, Vaishya, Aditya, additional, Vana, Milan, additional, Virkkula, Aki, additional, Vratolis, Stergios, additional, Weingartner, Ernest, additional, Wiedensohler, Alfred, additional, and Laj, Paolo, additional
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- 2018
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49. Light-absorption of dust and elemental carbon in snow in the Indian Himalayas and the Finnish Arctic
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Svensson, Jonas, primary, Ström, Johan, additional, Kivekäs, Niku, additional, Dkhar, Nathaniel B., additional, Tayal, Shresth, additional, Sharma, Ved P., additional, Jutila, Arttu, additional, Backman, John, additional, Virkkula, Aki, additional, Ruppel, Meri, additional, Hyvärinen, Antti, additional, Kontu, Anna, additional, Hannula, Henna-Reetta, additional, Leppäranta, Matti, additional, Hooda, Rakesh K., additional, Korhola, Atte, additional, Asmi, Eija, additional, and Lihavainen, Heikki, additional
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- 2018
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50. Supplementary material to "Seasonality of aerosol optical properties in the Arctic"
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Schmeisser, Lauren, primary, Backman, John, additional, Ogren, John A., additional, Andrews, Elisabeth, additional, Asmi, Eija, additional, Starkweather, Sandra, additional, Uttal, Taneil, additional, Fiebig, Markus, additional, Sharma, Sangeeta, additional, Eleftheriadis, Kostas, additional, Vratolis, Stergios, additional, Bergin, Michael, additional, Tunved, Peter, additional, and Jefferson, Anne, additional
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- 2018
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