Low-frequency coupled atmosphere-ocean variability in the southern Indian Ocean
The low-frequency atmosphere-ocean coupled variability of the southern Indian Ocean (SIO) was investigated using observation data over 1958-2010. These data were obtained from ECMWF for sea level pressure (SLP) and wind, from NCEP/NCAR for heat fluxes, and from the Hadley Center for SST. To obtain t...
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/12168 2023-05-15T13:40:36+02:00 Low-frequency coupled atmosphere-ocean variability in the southern Indian Ocean Feng Junqiao Hu Dunxin Yu Lejiang Feng, JQ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China. 2012-05-01 http://ir.qdio.ac.cn/handle/337002/12168 https://doi.org/10.1007/s00376-011-1096-2 英语 eng ADVANCES IN ATMOSPHERIC SCIENCES Feng Junqiao; Hu Dunxin; Yu Lejiang.Low-frequency coupled atmosphere-ocean variability in the southern Indian Ocean,ADVANCES IN ATMOSPHERIC SCIENCES,2012,29(3):544-560 http://ir.qdio.ac.cn/handle/337002/12168 doi:10.1007/s00376-011-1096-2 Southern Indian Ocean Sst Slp Antarctic Oscillation Meteorology & Atmospheric Sciences Article 期刊论文 2012 ftchinacasciocas https://doi.org/10.1007/s00376-011-1096-2 2022-06-27T05:34:20Z The low-frequency atmosphere-ocean coupled variability of the southern Indian Ocean (SIO) was investigated using observation data over 1958-2010. These data were obtained from ECMWF for sea level pressure (SLP) and wind, from NCEP/NCAR for heat fluxes, and from the Hadley Center for SST. To obtain the coupled air-sea variability, we performed SVD analyses on SST and SLP. The primary coupled mode represents 43% of the total square covariance and is featured by weak westerly winds along 45A degrees-30A degrees S. This weakened subtropical anticyclone forces fluctuations in a well-known subtropical dipole structure in the SST via wind-induced processes. The SST changes in response to atmosphere forcing and is predictable with a lead-time of 1-2 months. Atmosphere-ocean coupling of this mode is strongest during the austral summer. Its principle component is characterized by mixed interannual and interdecadal fluctuations. There is a strong relationship between the first mode and Antarctic Oscillation (AAO). The AAO can influence the coupled processes in the SIO by modulating the subtropical high. The second mode, accounting for 30% of the total square covariance, represents a 25-year period interdecadal oscillation in the strength of the subtropical anticyclone that is accompanied by fluctuations of a monopole structure in the SST along the 35A degrees-25A degrees S band. It is caused by subsidence of the atmosphere. The present study also shows that physical processes of both local thermodynamic and ocean circulation in the SIO have a crucial role in the formation of the atmosphere-ocean covariability. Article in Journal/Newspaper Antarc* Antarctic Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Antarctic Austral Indian Advances in Atmospheric Sciences 29 3 544 560 |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
Southern Indian Ocean Sst Slp Antarctic Oscillation Meteorology & Atmospheric Sciences |
spellingShingle |
Southern Indian Ocean Sst Slp Antarctic Oscillation Meteorology & Atmospheric Sciences Feng Junqiao Hu Dunxin Yu Lejiang Feng, JQ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China. Low-frequency coupled atmosphere-ocean variability in the southern Indian Ocean |
topic_facet |
Southern Indian Ocean Sst Slp Antarctic Oscillation Meteorology & Atmospheric Sciences |
description |
The low-frequency atmosphere-ocean coupled variability of the southern Indian Ocean (SIO) was investigated using observation data over 1958-2010. These data were obtained from ECMWF for sea level pressure (SLP) and wind, from NCEP/NCAR for heat fluxes, and from the Hadley Center for SST. To obtain the coupled air-sea variability, we performed SVD analyses on SST and SLP. The primary coupled mode represents 43% of the total square covariance and is featured by weak westerly winds along 45A degrees-30A degrees S. This weakened subtropical anticyclone forces fluctuations in a well-known subtropical dipole structure in the SST via wind-induced processes. The SST changes in response to atmosphere forcing and is predictable with a lead-time of 1-2 months. Atmosphere-ocean coupling of this mode is strongest during the austral summer. Its principle component is characterized by mixed interannual and interdecadal fluctuations. There is a strong relationship between the first mode and Antarctic Oscillation (AAO). The AAO can influence the coupled processes in the SIO by modulating the subtropical high. The second mode, accounting for 30% of the total square covariance, represents a 25-year period interdecadal oscillation in the strength of the subtropical anticyclone that is accompanied by fluctuations of a monopole structure in the SST along the 35A degrees-25A degrees S band. It is caused by subsidence of the atmosphere. The present study also shows that physical processes of both local thermodynamic and ocean circulation in the SIO have a crucial role in the formation of the atmosphere-ocean covariability. |
format |
Article in Journal/Newspaper |
author |
Feng Junqiao Hu Dunxin Yu Lejiang Feng, JQ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China. |
author_facet |
Feng Junqiao Hu Dunxin Yu Lejiang Feng, JQ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China. |
author_sort |
Feng Junqiao |
title |
Low-frequency coupled atmosphere-ocean variability in the southern Indian Ocean |
title_short |
Low-frequency coupled atmosphere-ocean variability in the southern Indian Ocean |
title_full |
Low-frequency coupled atmosphere-ocean variability in the southern Indian Ocean |
title_fullStr |
Low-frequency coupled atmosphere-ocean variability in the southern Indian Ocean |
title_full_unstemmed |
Low-frequency coupled atmosphere-ocean variability in the southern Indian Ocean |
title_sort |
low-frequency coupled atmosphere-ocean variability in the southern indian ocean |
publishDate |
2012 |
url |
http://ir.qdio.ac.cn/handle/337002/12168 https://doi.org/10.1007/s00376-011-1096-2 |
geographic |
Antarctic Austral Indian |
geographic_facet |
Antarctic Austral Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
ADVANCES IN ATMOSPHERIC SCIENCES Feng Junqiao; Hu Dunxin; Yu Lejiang.Low-frequency coupled atmosphere-ocean variability in the southern Indian Ocean,ADVANCES IN ATMOSPHERIC SCIENCES,2012,29(3):544-560 http://ir.qdio.ac.cn/handle/337002/12168 doi:10.1007/s00376-011-1096-2 |
op_doi |
https://doi.org/10.1007/s00376-011-1096-2 |
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Advances in Atmospheric Sciences |
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29 |
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3 |
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544 |
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