Impacts of Saharan Mineral Dust on Air‐Sea Interaction over North Atlantic Ocean Using a Fully Coupled Regional Model
This study examines the modifications of air-sea coupling processes by dust-radiation-cloud interactions over the North Atlantic Ocean using a high-resolution coupled atmosphere-wave-ocean-dust (AWOD) regional model. The dust-induced mechanisms that are responsible for changes of sea surface tempera...
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ftcdlib:oai:escholarship.org:ark:/13030/qt5fc5j4n2 2024-04-21T08:07:32+00:00 Impacts of Saharan Mineral Dust on Air‐Sea Interaction over North Atlantic Ocean Using a Fully Coupled Regional Model Chen, Shu‐Hua Huang, Chu‐Chun Kuo, Yi‐Chun Tseng, Yu‐Heng Gu, Yu Earl, Kenneth Chen, Chih‐Ying Choi, Yonghan Liou, Kuo‐Nan e2020jd033586 2021-02-27 https://escholarship.org/uc/item/5fc5j4n2 unknown eScholarship, University of California qt5fc5j4n2 https://escholarship.org/uc/item/5fc5j4n2 public Journal of Geophysical Research: Atmospheres, vol 126, iss 4 Earth Sciences Oceanography Life Below Water African dust air‐ sea interaction COAWST dust‐ cloud‐ radiation interaction mixed layer depth sea surface temperature surface heat fluxes wind stress curl air‐sea interaction dust‐cloud‐radiation interaction Atmospheric Sciences Physical Geography and Environmental Geoscience Climate change science article 2021 ftcdlib 2024-03-27T15:19:54Z This study examines the modifications of air-sea coupling processes by dust-radiation-cloud interactions over the North Atlantic Ocean using a high-resolution coupled atmosphere-wave-ocean-dust (AWOD) regional model. The dust-induced mechanisms that are responsible for changes of sea surface temperature (SST) and latent and sensible heat fluxes (LHF/SHF) are also examined. Two 3-month numerical experiments are conducted, and they differ only in the activation and deactivation of dust-radiation-cloud interactions. Model results show that the dust significantly reduces surface downward radiation fluxes (SDRF) over the ocean with the maximum change of 20-30Wm-2. Over the dust plume region, the dust effect creates a low-pressure anomaly and a cyclonic circulation anomaly, which drives a positive wind stress curl anomaly, thereby reducing sea surface height and mixed layer depth. However, the SST change by dust, ranging from -0.5 to 0.5 K, has a great spatial variation which differs from the dust plume shape. Dust cools SST around the West African coast, except under the maximum dust plume ridge, and extends westward asymmetrically along the northern and southern edges of the dust plume. Dust unexpectedly warms SST over a large area of the western tropical North Atlantic and north of the dust plume. These SST changes are controlled by different mechanisms. Unlike the SST change pattern, the LHF and SHF changes are mostly reduced underneath the dust plume region, though they are different in detail due to different dominant factors, and increased south of the dust plume over the tropic. Article in Journal/Newspaper North Atlantic University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Oceanography Life Below Water African dust air‐ sea interaction COAWST dust‐ cloud‐ radiation interaction mixed layer depth sea surface temperature surface heat fluxes wind stress curl air‐sea interaction dust‐cloud‐radiation interaction Atmospheric Sciences Physical Geography and Environmental Geoscience Climate change science |
spellingShingle |
Earth Sciences Oceanography Life Below Water African dust air‐ sea interaction COAWST dust‐ cloud‐ radiation interaction mixed layer depth sea surface temperature surface heat fluxes wind stress curl air‐sea interaction dust‐cloud‐radiation interaction Atmospheric Sciences Physical Geography and Environmental Geoscience Climate change science Chen, Shu‐Hua Huang, Chu‐Chun Kuo, Yi‐Chun Tseng, Yu‐Heng Gu, Yu Earl, Kenneth Chen, Chih‐Ying Choi, Yonghan Liou, Kuo‐Nan Impacts of Saharan Mineral Dust on Air‐Sea Interaction over North Atlantic Ocean Using a Fully Coupled Regional Model |
topic_facet |
Earth Sciences Oceanography Life Below Water African dust air‐ sea interaction COAWST dust‐ cloud‐ radiation interaction mixed layer depth sea surface temperature surface heat fluxes wind stress curl air‐sea interaction dust‐cloud‐radiation interaction Atmospheric Sciences Physical Geography and Environmental Geoscience Climate change science |
description |
This study examines the modifications of air-sea coupling processes by dust-radiation-cloud interactions over the North Atlantic Ocean using a high-resolution coupled atmosphere-wave-ocean-dust (AWOD) regional model. The dust-induced mechanisms that are responsible for changes of sea surface temperature (SST) and latent and sensible heat fluxes (LHF/SHF) are also examined. Two 3-month numerical experiments are conducted, and they differ only in the activation and deactivation of dust-radiation-cloud interactions. Model results show that the dust significantly reduces surface downward radiation fluxes (SDRF) over the ocean with the maximum change of 20-30Wm-2. Over the dust plume region, the dust effect creates a low-pressure anomaly and a cyclonic circulation anomaly, which drives a positive wind stress curl anomaly, thereby reducing sea surface height and mixed layer depth. However, the SST change by dust, ranging from -0.5 to 0.5 K, has a great spatial variation which differs from the dust plume shape. Dust cools SST around the West African coast, except under the maximum dust plume ridge, and extends westward asymmetrically along the northern and southern edges of the dust plume. Dust unexpectedly warms SST over a large area of the western tropical North Atlantic and north of the dust plume. These SST changes are controlled by different mechanisms. Unlike the SST change pattern, the LHF and SHF changes are mostly reduced underneath the dust plume region, though they are different in detail due to different dominant factors, and increased south of the dust plume over the tropic. |
format |
Article in Journal/Newspaper |
author |
Chen, Shu‐Hua Huang, Chu‐Chun Kuo, Yi‐Chun Tseng, Yu‐Heng Gu, Yu Earl, Kenneth Chen, Chih‐Ying Choi, Yonghan Liou, Kuo‐Nan |
author_facet |
Chen, Shu‐Hua Huang, Chu‐Chun Kuo, Yi‐Chun Tseng, Yu‐Heng Gu, Yu Earl, Kenneth Chen, Chih‐Ying Choi, Yonghan Liou, Kuo‐Nan |
author_sort |
Chen, Shu‐Hua |
title |
Impacts of Saharan Mineral Dust on Air‐Sea Interaction over North Atlantic Ocean Using a Fully Coupled Regional Model |
title_short |
Impacts of Saharan Mineral Dust on Air‐Sea Interaction over North Atlantic Ocean Using a Fully Coupled Regional Model |
title_full |
Impacts of Saharan Mineral Dust on Air‐Sea Interaction over North Atlantic Ocean Using a Fully Coupled Regional Model |
title_fullStr |
Impacts of Saharan Mineral Dust on Air‐Sea Interaction over North Atlantic Ocean Using a Fully Coupled Regional Model |
title_full_unstemmed |
Impacts of Saharan Mineral Dust on Air‐Sea Interaction over North Atlantic Ocean Using a Fully Coupled Regional Model |
title_sort |
impacts of saharan mineral dust on air‐sea interaction over north atlantic ocean using a fully coupled regional model |
publisher |
eScholarship, University of California |
publishDate |
2021 |
url |
https://escholarship.org/uc/item/5fc5j4n2 |
op_coverage |
e2020jd033586 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Journal of Geophysical Research: Atmospheres, vol 126, iss 4 |
op_relation |
qt5fc5j4n2 https://escholarship.org/uc/item/5fc5j4n2 |
op_rights |
public |
_version_ |
1796947457152647168 |