A cloud-resolving model study of aerosol-cloud correlation in a pristine maritime environment
In convective clouds, satellite-observed deepening or increased amount of clouds with increasing aerosol concentration has been reported and is sometimes interpreted as aerosol-induced invigoration of the clouds. However, such correlations can be affected by meteorological factors that affect both a...
Published in: | Geophysical Research Letters |
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American Geophysical Union (AGU)
2017
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_57205 2024-05-19T07:48:58+00:00 A cloud-resolving model study of aerosol-cloud correlation in a pristine maritime environment Nishant, N Sherwood, SC Geoffroy, Olivier 2017-06-16 application/pdf http://hdl.handle.net/1959.4/unsworks_57205 https://unsworks.unsw.edu.au/bitstreams/fc6facbf-90ca-4d45-8724-ada9096f2424/download https://doi.org/10.1002/2017GL073267 unknown American Geophysical Union (AGU) http://hdl.handle.net/1959.4/unsworks_57205 https://unsworks.unsw.edu.au/bitstreams/fc6facbf-90ca-4d45-8724-ada9096f2424/download https://doi.org/10.1002/2017GL073267 open access https://purl.org/coar/access_right/c_abf2 CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ free_to_read urn:ISSN:0094-8276 urn:ISSN:1944-8007 Geophysical Research Letters, 44, 11, 5774-5781 journal article http://purl.org/coar/resource_type/c_6501 2017 ftunswworks https://doi.org/10.1002/2017GL073267 2024-04-24T00:58:54Z In convective clouds, satellite-observed deepening or increased amount of clouds with increasing aerosol concentration has been reported and is sometimes interpreted as aerosol-induced invigoration of the clouds. However, such correlations can be affected by meteorological factors that affect both aerosol and clouds, as well as observational issues. In this study, we examine the behavior in a 660 × 660 km2 region of the South Pacific during June 2007, previously found by Koren et al. (2014) to show strong correlation between cloud fraction, cloud top pressure, and aerosols, using a cloud-resolving model with meteorological boundary conditions specified from a reanalysis. The model assumes constant aerosol loading, yet reproduces vigorous clouds at times of high real-world aerosol concentrations. Days with high- and low-aerosol loading exhibit deep-convective and shallow clouds, respectively, in both observations and the simulation. Synoptic analysis shows that vigorous clouds occur at times of strong surface troughs, which are associated with high winds and advection of boundary layer air from the Southern Ocean where sea-salt aerosol is abundant, thus accounting for the high correlation. Our model results show that aerosol-cloud relationships can be explained by coexisting but independent wind-aerosol and wind-cloud relationships and that no cloud condensation nuclei effect is required. Article in Journal/Newspaper Southern Ocean UNSW Sydney (The University of New South Wales): UNSWorks Geophysical Research Letters 44 11 5774 5781 |
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Open Polar |
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UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
description |
In convective clouds, satellite-observed deepening or increased amount of clouds with increasing aerosol concentration has been reported and is sometimes interpreted as aerosol-induced invigoration of the clouds. However, such correlations can be affected by meteorological factors that affect both aerosol and clouds, as well as observational issues. In this study, we examine the behavior in a 660 × 660 km2 region of the South Pacific during June 2007, previously found by Koren et al. (2014) to show strong correlation between cloud fraction, cloud top pressure, and aerosols, using a cloud-resolving model with meteorological boundary conditions specified from a reanalysis. The model assumes constant aerosol loading, yet reproduces vigorous clouds at times of high real-world aerosol concentrations. Days with high- and low-aerosol loading exhibit deep-convective and shallow clouds, respectively, in both observations and the simulation. Synoptic analysis shows that vigorous clouds occur at times of strong surface troughs, which are associated with high winds and advection of boundary layer air from the Southern Ocean where sea-salt aerosol is abundant, thus accounting for the high correlation. Our model results show that aerosol-cloud relationships can be explained by coexisting but independent wind-aerosol and wind-cloud relationships and that no cloud condensation nuclei effect is required. |
format |
Article in Journal/Newspaper |
author |
Nishant, N Sherwood, SC Geoffroy, Olivier |
spellingShingle |
Nishant, N Sherwood, SC Geoffroy, Olivier A cloud-resolving model study of aerosol-cloud correlation in a pristine maritime environment |
author_facet |
Nishant, N Sherwood, SC Geoffroy, Olivier |
author_sort |
Nishant, N |
title |
A cloud-resolving model study of aerosol-cloud correlation in a pristine maritime environment |
title_short |
A cloud-resolving model study of aerosol-cloud correlation in a pristine maritime environment |
title_full |
A cloud-resolving model study of aerosol-cloud correlation in a pristine maritime environment |
title_fullStr |
A cloud-resolving model study of aerosol-cloud correlation in a pristine maritime environment |
title_full_unstemmed |
A cloud-resolving model study of aerosol-cloud correlation in a pristine maritime environment |
title_sort |
cloud-resolving model study of aerosol-cloud correlation in a pristine maritime environment |
publisher |
American Geophysical Union (AGU) |
publishDate |
2017 |
url |
http://hdl.handle.net/1959.4/unsworks_57205 https://unsworks.unsw.edu.au/bitstreams/fc6facbf-90ca-4d45-8724-ada9096f2424/download https://doi.org/10.1002/2017GL073267 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
urn:ISSN:0094-8276 urn:ISSN:1944-8007 Geophysical Research Letters, 44, 11, 5774-5781 |
op_relation |
http://hdl.handle.net/1959.4/unsworks_57205 https://unsworks.unsw.edu.au/bitstreams/fc6facbf-90ca-4d45-8724-ada9096f2424/download https://doi.org/10.1002/2017GL073267 |
op_rights |
open access https://purl.org/coar/access_right/c_abf2 CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ free_to_read |
op_doi |
https://doi.org/10.1002/2017GL073267 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
11 |
container_start_page |
5774 |
op_container_end_page |
5781 |
_version_ |
1799467362685026304 |