Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean
Five overcast marine stratocumulus cases during the Southern Ocean Clouds Radiation Aerosol Transport Experimental Study (SOCRATES) aircraft field campaign were selected to examine aerosol and cloud condensation nuclei (CCN) properties with cloud influence. The Aitken- and accumulation-mode aerosols...
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Multidisciplinary Digital Publishing Institute (MDPI)
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Online Access: | http://hdl.handle.net/10150/673588 https://doi.org/10.3390/atmos14081246 |
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ftunivarizona:oai:repository.arizona.edu:10150/673588 2024-09-15T18:37:02+00:00 Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean Zhang, X. Dong, X. Xi, B. Zheng, X. Department of Hydrology and Atmospheric Science, The University of Arizona 2023-08-04 http://hdl.handle.net/10150/673588 https://doi.org/10.3390/atmos14081246 en eng Multidisciplinary Digital Publishing Institute (MDPI) Zhang, X.; Dong, X.; Xi, B.; Zheng, X. Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean. Atmosphere 2023, 14, 1246. https://doi.org/10.3390/atmos14081246 2073-4433 doi:10.3390/atmos14081246 http://hdl.handle.net/10150/673588 Atmosphere © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license. https://creativecommons.org/licenses/by/4.0/ Atmosphere aerosol and CCN properties above and below cloud regimes over the Southern Ocean chemical and physical cloud-processing mechanisms Article text 2023 ftunivarizona https://doi.org/10.3390/atmos14081246 2024-08-05T23:37:17Z Five overcast marine stratocumulus cases during the Southern Ocean Clouds Radiation Aerosol Transport Experimental Study (SOCRATES) aircraft field campaign were selected to examine aerosol and cloud condensation nuclei (CCN) properties with cloud influence. The Aitken- and accumulation-mode aerosols contributed approximately 70% and 30% of the total aerosols, respectively. The aerosol properties before and after periods of drizzle were investigated using in situ measurements during one case. Sub-cloud drizzle processes impacted accumulation-mode aerosols and CCN distribution. There was a nearly linear increase in CCN number concentration (NCCN) with supersaturation (S) during the ‘before drizzle’ period, but this was not true for the ‘after drizzle’ period, particularly when S > 0.4%. Using the hygroscopicity parameter (κ) to quantitatively investigate the chemical cloud-processing mechanisms, we found that higher κ values (>0.4) represent cloud-processing aerosols, while lower κ values (<0.1) represent newly formed aerosols. When the supersaturation is less than the Hoppel minimum (0.22%), cloud processing is dominant, whereas sea-spray aerosols are dominant contributors to CCN activation when S exceeds 0.22% but is less than 0.32%, the effective supersaturation threshold. Sea salt is considered a non-cloud-processing aerosol and is large and hygroscopic enough to form cloud droplets. © 2023 by the authors. Open access journal This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. Article in Journal/Newspaper Southern Ocean The University of Arizona: UA Campus Repository Atmosphere 14 8 1246 |
institution |
Open Polar |
collection |
The University of Arizona: UA Campus Repository |
op_collection_id |
ftunivarizona |
language |
English |
topic |
aerosol and CCN properties above and below cloud regimes over the Southern Ocean chemical and physical cloud-processing mechanisms |
spellingShingle |
aerosol and CCN properties above and below cloud regimes over the Southern Ocean chemical and physical cloud-processing mechanisms Zhang, X. Dong, X. Xi, B. Zheng, X. Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean |
topic_facet |
aerosol and CCN properties above and below cloud regimes over the Southern Ocean chemical and physical cloud-processing mechanisms |
description |
Five overcast marine stratocumulus cases during the Southern Ocean Clouds Radiation Aerosol Transport Experimental Study (SOCRATES) aircraft field campaign were selected to examine aerosol and cloud condensation nuclei (CCN) properties with cloud influence. The Aitken- and accumulation-mode aerosols contributed approximately 70% and 30% of the total aerosols, respectively. The aerosol properties before and after periods of drizzle were investigated using in situ measurements during one case. Sub-cloud drizzle processes impacted accumulation-mode aerosols and CCN distribution. There was a nearly linear increase in CCN number concentration (NCCN) with supersaturation (S) during the ‘before drizzle’ period, but this was not true for the ‘after drizzle’ period, particularly when S > 0.4%. Using the hygroscopicity parameter (κ) to quantitatively investigate the chemical cloud-processing mechanisms, we found that higher κ values (>0.4) represent cloud-processing aerosols, while lower κ values (<0.1) represent newly formed aerosols. When the supersaturation is less than the Hoppel minimum (0.22%), cloud processing is dominant, whereas sea-spray aerosols are dominant contributors to CCN activation when S exceeds 0.22% but is less than 0.32%, the effective supersaturation threshold. Sea salt is considered a non-cloud-processing aerosol and is large and hygroscopic enough to form cloud droplets. © 2023 by the authors. Open access journal This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. |
author2 |
Department of Hydrology and Atmospheric Science, The University of Arizona |
format |
Article in Journal/Newspaper |
author |
Zhang, X. Dong, X. Xi, B. Zheng, X. |
author_facet |
Zhang, X. Dong, X. Xi, B. Zheng, X. |
author_sort |
Zhang, X. |
title |
Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean |
title_short |
Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean |
title_full |
Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean |
title_fullStr |
Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean |
title_full_unstemmed |
Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean |
title_sort |
aerosol properties and their influences on marine boundary layer cloud condensation nuclei over the southern ocean |
publisher |
Multidisciplinary Digital Publishing Institute (MDPI) |
publishDate |
2023 |
url |
http://hdl.handle.net/10150/673588 https://doi.org/10.3390/atmos14081246 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Atmosphere |
op_relation |
Zhang, X.; Dong, X.; Xi, B.; Zheng, X. Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean. Atmosphere 2023, 14, 1246. https://doi.org/10.3390/atmos14081246 2073-4433 doi:10.3390/atmos14081246 http://hdl.handle.net/10150/673588 Atmosphere |
op_rights |
© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license. https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/atmos14081246 |
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Atmosphere |
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14 |
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8 |
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1246 |
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