A six year satellite-based assessment of the regional variations in aerosol indirect effects: A six year satellite-based assessment of the regional variations inaerosol indirect effects
Aerosols act as cloud condensation nuclei (CCN) for cloud water droplets, and changes in aerosol concentrations have significant microphysical impacts on the corresponding cloud properties. Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol and cloud properties are combined with NCEP Rean...
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ftunivleipzig:oai:qucosa:de:qucosa:13837 2023-09-05T13:21:46+02:00 A six year satellite-based assessment of the regional variations in aerosol indirect effects: A six year satellite-based assessment of the regional variations inaerosol indirect effects Jones, Thomas A. Christopher, Sundar A. Quaas, Johannes University of Alabama Max-Planck-Institut für Meteorologie 2015-10-29 https://nbn-resolving.org/urn:nbn:de:bsz:15-qucosa-186136 https://ul.qucosa.de/id/qucosa%3A13837 https://ul.qucosa.de/api/qucosa%3A13837/attachment/ATT-0/ eng eng Copernicus Publications urn:nbn:de:bsz:15-qucosa-186136 https://ul.qucosa.de/id/qucosa%3A13837 https://ul.qucosa.de/api/qucosa%3A13837/attachment/ATT-0/ info:eu-repo/semantics/openAccess Atmospheric chemistry and physics (2009) 9, S. 4091-4114 info:eu-repo/classification/ddc/551 ddc:551 Klima Atmosphäre Wolken Aerosol climate atmosphere clouds doc-type:article info:eu-repo/semantics/article doc-type:Text 2015 ftunivleipzig 2023-08-11T13:58:13Z Aerosols act as cloud condensation nuclei (CCN) for cloud water droplets, and changes in aerosol concentrations have significant microphysical impacts on the corresponding cloud properties. Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol and cloud properties are combined with NCEP Reanalysis data for six different regions around the globe between March 2000 and December 2005 to study the effects of different aerosol, cloud, and atmospheric conditions on the aerosol indirect effect (AIE). Emphasis is placed in examining the relative importance of aerosol concentration, type, and atmospheric conditions (mainly vertical motion) to AIE from region to region. Results show that in most regions, AIE has a distinct seasonal cycle, though the cycle varies in significance and period from region to region. In the Arabian Sea (AS), the sixyear mean anthropogenic + dust AIE is −0.27Wm−2 and is greatest during the summer months (<−2.0Wm−2) during which aerosol concentrations (from both dust and anthropogenic sources) are greatest. Comparing AIE as a function of thin (LWP<20 gm−2) vs. thick (LWP≥20 gm−2) clouds under conditions of large scale ascent or decent at 850 hPa showed that AIE is greatest for thick clouds during periods of upward vertical motion. In the Bay of Bengal, AIE is negligible owing to less favorable atmospheric conditions, a lower concentration of aerosols, and a non-alignment of aerosol and cloud layers. In the eastern North Atlantic, AIE is weakly positive (+0.1Wm−2) with dust aerosol concentration being much greater than the anthropogenic or sea salt components. However, elevated dust in this region exists above the maritime cloud layers and does not have a hygroscopic coating, which occurs in AS, preventing the dust from acting as CCN and limiting AIE. The Western Atlantic has a large anthropogenic aerosol concentration transported from the eastern United States producing a modest anthropogenic AIE (−0.46Wm−2). Anthropogenic AIE is also present off the West African coast corresponding ... Article in Journal/Newspaper North Atlantic Universität Leipzig: Qucosa |
institution |
Open Polar |
collection |
Universität Leipzig: Qucosa |
op_collection_id |
ftunivleipzig |
language |
English |
topic |
info:eu-repo/classification/ddc/551 ddc:551 Klima Atmosphäre Wolken Aerosol climate atmosphere clouds |
spellingShingle |
info:eu-repo/classification/ddc/551 ddc:551 Klima Atmosphäre Wolken Aerosol climate atmosphere clouds Jones, Thomas A. Christopher, Sundar A. Quaas, Johannes A six year satellite-based assessment of the regional variations in aerosol indirect effects: A six year satellite-based assessment of the regional variations inaerosol indirect effects |
topic_facet |
info:eu-repo/classification/ddc/551 ddc:551 Klima Atmosphäre Wolken Aerosol climate atmosphere clouds |
description |
Aerosols act as cloud condensation nuclei (CCN) for cloud water droplets, and changes in aerosol concentrations have significant microphysical impacts on the corresponding cloud properties. Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol and cloud properties are combined with NCEP Reanalysis data for six different regions around the globe between March 2000 and December 2005 to study the effects of different aerosol, cloud, and atmospheric conditions on the aerosol indirect effect (AIE). Emphasis is placed in examining the relative importance of aerosol concentration, type, and atmospheric conditions (mainly vertical motion) to AIE from region to region. Results show that in most regions, AIE has a distinct seasonal cycle, though the cycle varies in significance and period from region to region. In the Arabian Sea (AS), the sixyear mean anthropogenic + dust AIE is −0.27Wm−2 and is greatest during the summer months (<−2.0Wm−2) during which aerosol concentrations (from both dust and anthropogenic sources) are greatest. Comparing AIE as a function of thin (LWP<20 gm−2) vs. thick (LWP≥20 gm−2) clouds under conditions of large scale ascent or decent at 850 hPa showed that AIE is greatest for thick clouds during periods of upward vertical motion. In the Bay of Bengal, AIE is negligible owing to less favorable atmospheric conditions, a lower concentration of aerosols, and a non-alignment of aerosol and cloud layers. In the eastern North Atlantic, AIE is weakly positive (+0.1Wm−2) with dust aerosol concentration being much greater than the anthropogenic or sea salt components. However, elevated dust in this region exists above the maritime cloud layers and does not have a hygroscopic coating, which occurs in AS, preventing the dust from acting as CCN and limiting AIE. The Western Atlantic has a large anthropogenic aerosol concentration transported from the eastern United States producing a modest anthropogenic AIE (−0.46Wm−2). Anthropogenic AIE is also present off the West African coast corresponding ... |
author2 |
University of Alabama Max-Planck-Institut für Meteorologie |
format |
Article in Journal/Newspaper |
author |
Jones, Thomas A. Christopher, Sundar A. Quaas, Johannes |
author_facet |
Jones, Thomas A. Christopher, Sundar A. Quaas, Johannes |
author_sort |
Jones, Thomas A. |
title |
A six year satellite-based assessment of the regional variations in aerosol indirect effects: A six year satellite-based assessment of the regional variations inaerosol indirect effects |
title_short |
A six year satellite-based assessment of the regional variations in aerosol indirect effects: A six year satellite-based assessment of the regional variations inaerosol indirect effects |
title_full |
A six year satellite-based assessment of the regional variations in aerosol indirect effects: A six year satellite-based assessment of the regional variations inaerosol indirect effects |
title_fullStr |
A six year satellite-based assessment of the regional variations in aerosol indirect effects: A six year satellite-based assessment of the regional variations inaerosol indirect effects |
title_full_unstemmed |
A six year satellite-based assessment of the regional variations in aerosol indirect effects: A six year satellite-based assessment of the regional variations inaerosol indirect effects |
title_sort |
six year satellite-based assessment of the regional variations in aerosol indirect effects: a six year satellite-based assessment of the regional variations inaerosol indirect effects |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://nbn-resolving.org/urn:nbn:de:bsz:15-qucosa-186136 https://ul.qucosa.de/id/qucosa%3A13837 https://ul.qucosa.de/api/qucosa%3A13837/attachment/ATT-0/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmospheric chemistry and physics (2009) 9, S. 4091-4114 |
op_relation |
urn:nbn:de:bsz:15-qucosa-186136 https://ul.qucosa.de/id/qucosa%3A13837 https://ul.qucosa.de/api/qucosa%3A13837/attachment/ATT-0/ |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1776202340454367232 |