Characterization of organic aerosol across the global remote troposphere: A comparison of ATom measurements and global chemistry models
The spatial distribution and properties of submicron organic aerosol (OA) are among the key sources of uncertainty in our understanding of aerosol effects on climate. Uncertainties are particularly large over remote regions of the free troposphere and Southern Ocean, where very few data have been av...
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ftleibnizopen:oai:oai.leibnizopen.de:_hN2DYsBBwLIz6xGpucq 2023-11-05T03:45:14+01:00 Characterization of organic aerosol across the global remote troposphere: A comparison of ATom measurements and global chemistry models Hodzic, Alma Campuzano-Jost, Pedro Bian, Huisheng Chin, Mian Colarco, Peter R. Day, Douglas A. Froyd, Karl D. Heinold, Bernd Katich, Joseph M. Jo, Duseong S. Kodros, John K. Nault, Benjamin A. Pierce, Jeffrey R. Ray, Eric Schacht, Jacob Schill, Gregory P. Schroder, Jason C. Schwarz, Joshua P. Sueper, Donna T. Tegen, Ina Tilmes, Simone Tsigaridis, Kostas Yu, Pengfei Jimenez, Jose L. 2020 application/pdf https://oa.tib.eu/renate/handle/123456789/6953 https://doi.org/10.34657/6000 eng eng Katlenburg-Lindau : EGU CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ Atmospheric chemistry and physics 20 (2020), Nr. 8 aerosol composition aerosol formation mass spectrometry Northern Hemisphere numerical model spatial distribution troposphere uncertainty analysis 550 article Text 2020 ftleibnizopen https://doi.org/10.34657/6000 2023-10-08T23:26:20Z The spatial distribution and properties of submicron organic aerosol (OA) are among the key sources of uncertainty in our understanding of aerosol effects on climate. Uncertainties are particularly large over remote regions of the free troposphere and Southern Ocean, where very few data have been available and where OA predictions from AeroCom Phase II global models span 2 to 3 orders of magnitude, greatly exceeding the model spread over source regions. The (nearly) pole-to-pole vertical distribution of nonrefractory aerosols was measured with an aerosol mass spectrometer onboard the NASA DC-8 aircraft as part of the Atmospheric Tomography (ATom) mission during the Northern Hemisphere summer (August 2016) and winter (February 2017). This study presents the first extensive characterization of OA mass concentrations and their level of oxidation in the remote atmosphere. OA and sulfate are the major contributors by mass to submicron aerosols in the remote troposphere, together with sea salt in the marine boundary layer. Sulfate was dominant in the lower stratosphere. OA concentrations have a strong seasonal and zonal variability, with the highest levels measured in the lower troposphere in the summer and over the regions influenced by biomass burning from Africa (up to 10 μgsm-3). Lower concentrations (~ 0:1 0.3 μgsm-3) are observed in the northern middle and high latitudes and very low concentrations (< 0:1 μgsm-3) in the southern middle and high latitudes. The ATom dataset is used to evaluate predictions of eight current global chemistry models that implement a variety of commonly used representations of OA sources and chemistry, as well as of the AeroCom-II ensemble. The current model ensemble captures the average vertical and spatial distribution of measured OA concentrations, and the spread of the individual models remains within a factor of 5. These results are significantly improved over the AeroCom-II model ensemble, which shows large overestimations over these regions. However, some of the improved ... Article in Journal/Newspaper Southern Ocean LeibnizOpen (The Leibniz Association) |
institution |
Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
aerosol composition aerosol formation mass spectrometry Northern Hemisphere numerical model spatial distribution troposphere uncertainty analysis 550 |
spellingShingle |
aerosol composition aerosol formation mass spectrometry Northern Hemisphere numerical model spatial distribution troposphere uncertainty analysis 550 Hodzic, Alma Campuzano-Jost, Pedro Bian, Huisheng Chin, Mian Colarco, Peter R. Day, Douglas A. Froyd, Karl D. Heinold, Bernd Katich, Joseph M. Jo, Duseong S. Kodros, John K. Nault, Benjamin A. Pierce, Jeffrey R. Ray, Eric Schacht, Jacob Schill, Gregory P. Schroder, Jason C. Schwarz, Joshua P. Sueper, Donna T. Tegen, Ina Tilmes, Simone Tsigaridis, Kostas Yu, Pengfei Jimenez, Jose L. Characterization of organic aerosol across the global remote troposphere: A comparison of ATom measurements and global chemistry models |
topic_facet |
aerosol composition aerosol formation mass spectrometry Northern Hemisphere numerical model spatial distribution troposphere uncertainty analysis 550 |
description |
The spatial distribution and properties of submicron organic aerosol (OA) are among the key sources of uncertainty in our understanding of aerosol effects on climate. Uncertainties are particularly large over remote regions of the free troposphere and Southern Ocean, where very few data have been available and where OA predictions from AeroCom Phase II global models span 2 to 3 orders of magnitude, greatly exceeding the model spread over source regions. The (nearly) pole-to-pole vertical distribution of nonrefractory aerosols was measured with an aerosol mass spectrometer onboard the NASA DC-8 aircraft as part of the Atmospheric Tomography (ATom) mission during the Northern Hemisphere summer (August 2016) and winter (February 2017). This study presents the first extensive characterization of OA mass concentrations and their level of oxidation in the remote atmosphere. OA and sulfate are the major contributors by mass to submicron aerosols in the remote troposphere, together with sea salt in the marine boundary layer. Sulfate was dominant in the lower stratosphere. OA concentrations have a strong seasonal and zonal variability, with the highest levels measured in the lower troposphere in the summer and over the regions influenced by biomass burning from Africa (up to 10 μgsm-3). Lower concentrations (~ 0:1 0.3 μgsm-3) are observed in the northern middle and high latitudes and very low concentrations (< 0:1 μgsm-3) in the southern middle and high latitudes. The ATom dataset is used to evaluate predictions of eight current global chemistry models that implement a variety of commonly used representations of OA sources and chemistry, as well as of the AeroCom-II ensemble. The current model ensemble captures the average vertical and spatial distribution of measured OA concentrations, and the spread of the individual models remains within a factor of 5. These results are significantly improved over the AeroCom-II model ensemble, which shows large overestimations over these regions. However, some of the improved ... |
format |
Article in Journal/Newspaper |
author |
Hodzic, Alma Campuzano-Jost, Pedro Bian, Huisheng Chin, Mian Colarco, Peter R. Day, Douglas A. Froyd, Karl D. Heinold, Bernd Katich, Joseph M. Jo, Duseong S. Kodros, John K. Nault, Benjamin A. Pierce, Jeffrey R. Ray, Eric Schacht, Jacob Schill, Gregory P. Schroder, Jason C. Schwarz, Joshua P. Sueper, Donna T. Tegen, Ina Tilmes, Simone Tsigaridis, Kostas Yu, Pengfei Jimenez, Jose L. |
author_facet |
Hodzic, Alma Campuzano-Jost, Pedro Bian, Huisheng Chin, Mian Colarco, Peter R. Day, Douglas A. Froyd, Karl D. Heinold, Bernd Katich, Joseph M. Jo, Duseong S. Kodros, John K. Nault, Benjamin A. Pierce, Jeffrey R. Ray, Eric Schacht, Jacob Schill, Gregory P. Schroder, Jason C. Schwarz, Joshua P. Sueper, Donna T. Tegen, Ina Tilmes, Simone Tsigaridis, Kostas Yu, Pengfei Jimenez, Jose L. |
author_sort |
Hodzic, Alma |
title |
Characterization of organic aerosol across the global remote troposphere: A comparison of ATom measurements and global chemistry models |
title_short |
Characterization of organic aerosol across the global remote troposphere: A comparison of ATom measurements and global chemistry models |
title_full |
Characterization of organic aerosol across the global remote troposphere: A comparison of ATom measurements and global chemistry models |
title_fullStr |
Characterization of organic aerosol across the global remote troposphere: A comparison of ATom measurements and global chemistry models |
title_full_unstemmed |
Characterization of organic aerosol across the global remote troposphere: A comparison of ATom measurements and global chemistry models |
title_sort |
characterization of organic aerosol across the global remote troposphere: a comparison of atom measurements and global chemistry models |
publisher |
Katlenburg-Lindau : EGU |
publishDate |
2020 |
url |
https://oa.tib.eu/renate/handle/123456789/6953 https://doi.org/10.34657/6000 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Atmospheric chemistry and physics 20 (2020), Nr. 8 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.34657/6000 |
_version_ |
1781706967982538752 |