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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ftdoajarticles:oai:doaj.org/article:10e124eb797242b29ff71b1724a392fe 2023-09-26T15:23:19+02:00 Aerosol Properties and Their Influences on Marine Boundary Layer Cloud Condensation Nuclei over the Southern Ocean Xingyu Zhang Xiquan Dong Baike Xi Xiaojian Zheng 2023-08-01T00:00:00Z https://doi.org/10.3390/atmos14081246 https://doaj.org/article/10e124eb797242b29ff71b1724a392fe EN eng MDPI AG https://www.mdpi.com/2073-4433/14/8/1246 https://doaj.org/toc/2073-4433 doi:10.3390/atmos14081246 2073-4433 https://doaj.org/article/10e124eb797242b29ff71b1724a392fe Atmosphere, Vol 14, Iss 1246, p 1246 (2023) aerosol and CCN properties above and below cloud regimes over the Southern Ocean chemical and physical cloud-processing mechanisms Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.3390/atmos14081246 2023-08-27T00:36:09Z 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 (N CCN ) 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. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Aitken ENVELOPE(-44.516,-44.516,-60.733,-60.733) Southern Ocean Atmosphere 14 8 1246 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
aerosol and CCN properties above and below cloud regimes over the Southern Ocean chemical and physical cloud-processing mechanisms Meteorology. Climatology QC851-999 |
spellingShingle |
aerosol and CCN properties above and below cloud regimes over the Southern Ocean chemical and physical cloud-processing mechanisms Meteorology. Climatology QC851-999 Xingyu Zhang Xiquan Dong Baike Xi Xiaojian Zheng 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 Meteorology. Climatology QC851-999 |
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 (N CCN ) 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. |
format |
Article in Journal/Newspaper |
author |
Xingyu Zhang Xiquan Dong Baike Xi Xiaojian Zheng |
author_facet |
Xingyu Zhang Xiquan Dong Baike Xi Xiaojian Zheng |
author_sort |
Xingyu Zhang |
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 |
MDPI AG |
publishDate |
2023 |
url |
https://doi.org/10.3390/atmos14081246 https://doaj.org/article/10e124eb797242b29ff71b1724a392fe |
long_lat |
ENVELOPE(-44.516,-44.516,-60.733,-60.733) |
geographic |
Aitken Southern Ocean |
geographic_facet |
Aitken Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Atmosphere, Vol 14, Iss 1246, p 1246 (2023) |
op_relation |
https://www.mdpi.com/2073-4433/14/8/1246 https://doaj.org/toc/2073-4433 doi:10.3390/atmos14081246 2073-4433 https://doaj.org/article/10e124eb797242b29ff71b1724a392fe |
op_doi |
https://doi.org/10.3390/atmos14081246 |
container_title |
Atmosphere |
container_volume |
14 |
container_issue |
8 |
container_start_page |
1246 |
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1778149443330113536 |