Statistical characteristics and mechanism of the South Atlantic Ocean Dipole
Abstract The statistical characteristics and mechanism of the South Atlantic Ocean Dipole (SAOD) from 1980 to 2021 are analysed using observational datasets. The spatial pattern of the sea surface temperature anomaly (SSTA) during SAOD is a dipole pattern oriented in the northeast‐southwest directio...
Published in: | International Journal of Climatology |
---|---|
Main Authors: | , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2023
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/joc.8231 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8231 |
id |
crwiley:10.1002/joc.8231 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/joc.8231 2024-06-02T08:14:29+00:00 Statistical characteristics and mechanism of the South Atlantic Ocean Dipole Guan, Yuanhong Li, Yuxin Zhou, Wen Zou, Lanjun Wang, Xiaohong National Natural Science Foundation of China 2023 http://dx.doi.org/10.1002/joc.8231 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8231 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 43, issue 14, page 6733-6744 ISSN 0899-8418 1097-0088 journal-article 2023 crwiley https://doi.org/10.1002/joc.8231 2024-05-03T11:51:02Z Abstract The statistical characteristics and mechanism of the South Atlantic Ocean Dipole (SAOD) from 1980 to 2021 are analysed using observational datasets. The spatial pattern of the sea surface temperature anomaly (SSTA) during SAOD is a dipole pattern oriented in the northeast‐southwest direction, and the intensity of the SSTA in the northeast pole (NEP) is stronger than that in the southwest pole (SWP). SAOD has a decadal variability of about 12 years during 1980–2007, along with obvious seasonal phase‐locking, with the anomaly pattern developing in boreal spring (March–May), peaking in summer (June–August) and decaying in autumn (September–November). For a positive SAOD event (positive SSTA in the NEP, negative in the SWP), positive SSTA in the NEP grows due to a decrease in wind speed and thus in latent heat flux loss in boreal spring, as well as an increase in shortwave radiation flux from boreal spring to summer. However, southwesterly wind anomalies drive cold water from high latitudes to the SWP in boreal spring and summer, coupled with strong wind speed anomalies enhancing the loss of latent heat flux, which contributes to a negative SSTA in the SWP. In addition, the intensity of the SSTA in the SWP is weaker than that in the NEP because of the contribution of smaller shortwave radiation flux, sensible heat flux and larger mixed layer depth in the SWP in summer. For a negative SAOD mode (negative SSTA in the NEP, positive in the SWP), the wind, shortwave radiation flux, sensible heat flux and mixed layer depth anomalies are the opposite of those under a positive SAOD event. Article in Journal/Newspaper South Atlantic Ocean Wiley Online Library International Journal of Climatology |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The statistical characteristics and mechanism of the South Atlantic Ocean Dipole (SAOD) from 1980 to 2021 are analysed using observational datasets. The spatial pattern of the sea surface temperature anomaly (SSTA) during SAOD is a dipole pattern oriented in the northeast‐southwest direction, and the intensity of the SSTA in the northeast pole (NEP) is stronger than that in the southwest pole (SWP). SAOD has a decadal variability of about 12 years during 1980–2007, along with obvious seasonal phase‐locking, with the anomaly pattern developing in boreal spring (March–May), peaking in summer (June–August) and decaying in autumn (September–November). For a positive SAOD event (positive SSTA in the NEP, negative in the SWP), positive SSTA in the NEP grows due to a decrease in wind speed and thus in latent heat flux loss in boreal spring, as well as an increase in shortwave radiation flux from boreal spring to summer. However, southwesterly wind anomalies drive cold water from high latitudes to the SWP in boreal spring and summer, coupled with strong wind speed anomalies enhancing the loss of latent heat flux, which contributes to a negative SSTA in the SWP. In addition, the intensity of the SSTA in the SWP is weaker than that in the NEP because of the contribution of smaller shortwave radiation flux, sensible heat flux and larger mixed layer depth in the SWP in summer. For a negative SAOD mode (negative SSTA in the NEP, positive in the SWP), the wind, shortwave radiation flux, sensible heat flux and mixed layer depth anomalies are the opposite of those under a positive SAOD event. |
author2 |
National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Guan, Yuanhong Li, Yuxin Zhou, Wen Zou, Lanjun Wang, Xiaohong |
spellingShingle |
Guan, Yuanhong Li, Yuxin Zhou, Wen Zou, Lanjun Wang, Xiaohong Statistical characteristics and mechanism of the South Atlantic Ocean Dipole |
author_facet |
Guan, Yuanhong Li, Yuxin Zhou, Wen Zou, Lanjun Wang, Xiaohong |
author_sort |
Guan, Yuanhong |
title |
Statistical characteristics and mechanism of the South Atlantic Ocean Dipole |
title_short |
Statistical characteristics and mechanism of the South Atlantic Ocean Dipole |
title_full |
Statistical characteristics and mechanism of the South Atlantic Ocean Dipole |
title_fullStr |
Statistical characteristics and mechanism of the South Atlantic Ocean Dipole |
title_full_unstemmed |
Statistical characteristics and mechanism of the South Atlantic Ocean Dipole |
title_sort |
statistical characteristics and mechanism of the south atlantic ocean dipole |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/joc.8231 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8231 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
International Journal of Climatology volume 43, issue 14, page 6733-6744 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.8231 |
container_title |
International Journal of Climatology |
_version_ |
1800738356613611520 |