Southern Ocean Cloud Properties Derived From CAPRICORN and MARCUS Data
The properties of Southern Ocean (SO) liquid phase non precipitating clouds (hereafter clouds) are examined using shipborne data collected during the Measurements of Aerosols, Radiation and Clouds over the Southern Ocean and the Clouds Aerosols Precipitation Radiation and atmospheric Composition Ove...
Published in: | Journal of Geophysical Research: Atmospheres |
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Online Access: | http://www.osti.gov/servlets/purl/1852743 https://www.osti.gov/biblio/1852743 https://doi.org/10.1029/2020jd033368 |
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ftosti:oai:osti.gov:1852743 2023-07-30T03:59:09+02:00 Southern Ocean Cloud Properties Derived From CAPRICORN and MARCUS Data Mace, Gerald G. Protat, Alain Humphries, Ruhi S. Alexander, Simon P. McRobert, Ian M. Ward, Jason Selleck, Paul Keywood, Melita McFarquhar, Greg M. 2022-07-29 application/pdf http://www.osti.gov/servlets/purl/1852743 https://www.osti.gov/biblio/1852743 https://doi.org/10.1029/2020jd033368 unknown http://www.osti.gov/servlets/purl/1852743 https://www.osti.gov/biblio/1852743 https://doi.org/10.1029/2020jd033368 doi:10.1029/2020jd033368 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1029/2020jd033368 2023-07-11T10:10:54Z The properties of Southern Ocean (SO) liquid phase non precipitating clouds (hereafter clouds) are examined using shipborne data collected during the Measurements of Aerosols, Radiation and Clouds over the Southern Ocean and the Clouds Aerosols Precipitation Radiation and atmospheric Composition Over the SoutheRN ocean I and II campaigns that took place south of Australia during Autumn 2016 and Summer 2017–2018. Cloud properties are derived using data from W-band radars, lidars, and microwave radiometers using an optimal estimation algorithm. The SO clouds tended to have larger liquid water paths (LWP, 115 ± 117 g m -2 ), smaller effective radii (re, 8.7 ± 3 μm), and higher number concentrations (N d , 90 ± 107 cm-3) than typical values of eastern ocean basin stratocumulus. The clouds demonstrated a tendency for the LWP to increase with Nd presumably due to precipitation suppression up to Nd of approximately 100 cm -3 when mean LWP decreased with increasing Nd. Due to higher optical depth, cloud albedos were less susceptible to changes in Nd compared to subtropical stratocumulus. The highest latitude clouds of the datasets, observed along and near the Antarctic coast, presented a distinctly bimodal character. One mode had the properties of marine clouds further north. Additionally, the other mode occurred in an aerosol environment characterized by high cloud condensation nuclei concentrations and elevated sulfate aerosol without obvious continental aerosol markers. These regions of higher cloud condensation nuclei tended to have higher Nd, smaller re and higher LWP suggesting sensitivity of cloud properties to seasonal biogenic aerosol production in the high latitude SO. Other/Unknown Material Antarc* Antarctic Southern Ocean SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Antarctic Southern Ocean The Antarctic Journal of Geophysical Research: Atmospheres 126 4 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Mace, Gerald G. Protat, Alain Humphries, Ruhi S. Alexander, Simon P. McRobert, Ian M. Ward, Jason Selleck, Paul Keywood, Melita McFarquhar, Greg M. Southern Ocean Cloud Properties Derived From CAPRICORN and MARCUS Data |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
The properties of Southern Ocean (SO) liquid phase non precipitating clouds (hereafter clouds) are examined using shipborne data collected during the Measurements of Aerosols, Radiation and Clouds over the Southern Ocean and the Clouds Aerosols Precipitation Radiation and atmospheric Composition Over the SoutheRN ocean I and II campaigns that took place south of Australia during Autumn 2016 and Summer 2017–2018. Cloud properties are derived using data from W-band radars, lidars, and microwave radiometers using an optimal estimation algorithm. The SO clouds tended to have larger liquid water paths (LWP, 115 ± 117 g m -2 ), smaller effective radii (re, 8.7 ± 3 μm), and higher number concentrations (N d , 90 ± 107 cm-3) than typical values of eastern ocean basin stratocumulus. The clouds demonstrated a tendency for the LWP to increase with Nd presumably due to precipitation suppression up to Nd of approximately 100 cm -3 when mean LWP decreased with increasing Nd. Due to higher optical depth, cloud albedos were less susceptible to changes in Nd compared to subtropical stratocumulus. The highest latitude clouds of the datasets, observed along and near the Antarctic coast, presented a distinctly bimodal character. One mode had the properties of marine clouds further north. Additionally, the other mode occurred in an aerosol environment characterized by high cloud condensation nuclei concentrations and elevated sulfate aerosol without obvious continental aerosol markers. These regions of higher cloud condensation nuclei tended to have higher Nd, smaller re and higher LWP suggesting sensitivity of cloud properties to seasonal biogenic aerosol production in the high latitude SO. |
author |
Mace, Gerald G. Protat, Alain Humphries, Ruhi S. Alexander, Simon P. McRobert, Ian M. Ward, Jason Selleck, Paul Keywood, Melita McFarquhar, Greg M. |
author_facet |
Mace, Gerald G. Protat, Alain Humphries, Ruhi S. Alexander, Simon P. McRobert, Ian M. Ward, Jason Selleck, Paul Keywood, Melita McFarquhar, Greg M. |
author_sort |
Mace, Gerald G. |
title |
Southern Ocean Cloud Properties Derived From CAPRICORN and MARCUS Data |
title_short |
Southern Ocean Cloud Properties Derived From CAPRICORN and MARCUS Data |
title_full |
Southern Ocean Cloud Properties Derived From CAPRICORN and MARCUS Data |
title_fullStr |
Southern Ocean Cloud Properties Derived From CAPRICORN and MARCUS Data |
title_full_unstemmed |
Southern Ocean Cloud Properties Derived From CAPRICORN and MARCUS Data |
title_sort |
southern ocean cloud properties derived from capricorn and marcus data |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1852743 https://www.osti.gov/biblio/1852743 https://doi.org/10.1029/2020jd033368 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
http://www.osti.gov/servlets/purl/1852743 https://www.osti.gov/biblio/1852743 https://doi.org/10.1029/2020jd033368 doi:10.1029/2020jd033368 |
op_doi |
https://doi.org/10.1029/2020jd033368 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
126 |
container_issue |
4 |
_version_ |
1772809866872619008 |