Surface Heating over the Tibetan Plateau associated with the Antarctic Oscillation
The surface heating on the Tibetan Plateau (TP) exerts large influence on the Asian summer monsoon. Drivers of TP surface heat include tropical forcings and other climate modes in middle and high latitude of the Northern Hemisphere, however whether the climate modes in Southern Hemisphere influence...
Main Authors: | , , |
---|---|
Format: | Conference Object |
Language: | English |
Published: |
2023
|
Subjects: | |
Online Access: | https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020569 |
id |
ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5020569 |
---|---|
record_format |
openpolar |
spelling |
ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5020569 2023-07-23T04:13:21+02:00 Surface Heating over the Tibetan Plateau associated with the Antarctic Oscillation Tang, Y. Duan, A. Hu, J. 2023-07-11 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020569 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3043 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020569 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-3043 2023-07-02T23:40:09Z The surface heating on the Tibetan Plateau (TP) exerts large influence on the Asian summer monsoon. Drivers of TP surface heat include tropical forcings and other climate modes in middle and high latitude of the Northern Hemisphere, however whether the climate modes in Southern Hemisphere influence the TP surface heat is rarely studied. Using multiple source data diagnosis and numerical experiment from an atmospheric general circulation model (AGCM), we found that the Antarctic Oscillation (AAO) in May can efficiently modulate the subsequent surface heat source over the TP in June. When the AAO is in positive phases, a northeastward propagating atmospheric Rossby wave train originates from the Amundsen Sea low. As a part of this wave train, a pair of anomalous cyclone and anticyclone in the Southern Hemisphere accelerates the surface southeasterlies between them, accompanied by cold sea surface temperature (SST) anomaly in the equatorial middle and eastern Indian Ocean induced by the wind evaporation-SST feedback. Due to the large thermal inertia, in June, the cold SST anomaly stimulates anticyclone anomalies over the western TP and eastern Arabian Sea, which increase the moisture transportation toward the TP and are conducive to the formation and maintenance of the precipitation over the middle and eastern TP. In contrast, the surface heat source, which is dominated by the upward sensible heat flux, is reduced substantially. This result indicates that the AAO can be one of the precursors of the TP heat source, and may help improve the prediction of the Asian summer monsoon. Conference Object Amundsen Sea Antarc* Antarctic GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Amundsen Sea Antarctic Indian The Antarctic |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
The surface heating on the Tibetan Plateau (TP) exerts large influence on the Asian summer monsoon. Drivers of TP surface heat include tropical forcings and other climate modes in middle and high latitude of the Northern Hemisphere, however whether the climate modes in Southern Hemisphere influence the TP surface heat is rarely studied. Using multiple source data diagnosis and numerical experiment from an atmospheric general circulation model (AGCM), we found that the Antarctic Oscillation (AAO) in May can efficiently modulate the subsequent surface heat source over the TP in June. When the AAO is in positive phases, a northeastward propagating atmospheric Rossby wave train originates from the Amundsen Sea low. As a part of this wave train, a pair of anomalous cyclone and anticyclone in the Southern Hemisphere accelerates the surface southeasterlies between them, accompanied by cold sea surface temperature (SST) anomaly in the equatorial middle and eastern Indian Ocean induced by the wind evaporation-SST feedback. Due to the large thermal inertia, in June, the cold SST anomaly stimulates anticyclone anomalies over the western TP and eastern Arabian Sea, which increase the moisture transportation toward the TP and are conducive to the formation and maintenance of the precipitation over the middle and eastern TP. In contrast, the surface heat source, which is dominated by the upward sensible heat flux, is reduced substantially. This result indicates that the AAO can be one of the precursors of the TP heat source, and may help improve the prediction of the Asian summer monsoon. |
format |
Conference Object |
author |
Tang, Y. Duan, A. Hu, J. |
spellingShingle |
Tang, Y. Duan, A. Hu, J. Surface Heating over the Tibetan Plateau associated with the Antarctic Oscillation |
author_facet |
Tang, Y. Duan, A. Hu, J. |
author_sort |
Tang, Y. |
title |
Surface Heating over the Tibetan Plateau associated with the Antarctic Oscillation |
title_short |
Surface Heating over the Tibetan Plateau associated with the Antarctic Oscillation |
title_full |
Surface Heating over the Tibetan Plateau associated with the Antarctic Oscillation |
title_fullStr |
Surface Heating over the Tibetan Plateau associated with the Antarctic Oscillation |
title_full_unstemmed |
Surface Heating over the Tibetan Plateau associated with the Antarctic Oscillation |
title_sort |
surface heating over the tibetan plateau associated with the antarctic oscillation |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020569 |
geographic |
Amundsen Sea Antarctic Indian The Antarctic |
geographic_facet |
Amundsen Sea Antarctic Indian The Antarctic |
genre |
Amundsen Sea Antarc* Antarctic |
genre_facet |
Amundsen Sea Antarc* Antarctic |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3043 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020569 |
op_doi |
https://doi.org/10.57757/IUGG23-3043 |
_version_ |
1772178215081607168 |