| Relationship Between Upper-Ocean Heat Content in the Tropical Indian Ocean and Summer Precipitation in China |
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| 作者姓名： | HUANG Ke ZHANG Qi-Long XIE Qiang WANG Dong-Xiao |
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| 基金项目： | supported by the National Basic Research Program of China(973 Program):The impact of Southern Ocean-Indian Ocean air-sea processes on East Asia and the global climate change(Grant No.2010CB950300);National Foundation of the Indian Ocean Opening Voyage Project(Grant Nos. 41149903 and 41049908);the Knowledge Innovation Project for Distinguished Young Scholar of the Chinese Academy of Sciences (Grant No.KZCX2-EW-QN203);the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KZCX2-YWQ11-02);the National Natural Science Foundation of China (Grant No.40906010) |
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| 摘 要： | An analysis of the Ishii ocean heat content(OHC) in the tropical Indian Ocean from the surface to 700-m depth shows that the OHC changes dramatically on the interannual timescale in the Indian Ocean.The first mode of empirical orthogonal function(EOF1) of the OHC shows that there is a strong air-sea interaction pattern in the Indian Ocean with a positive(negative) loading in the east and a negative(positive) loading in the west.This seesaw oscillation pattern influences the summer precipitation in China with a North-South reversed distribution.Composite analysis shows that during a positive(negative) OHC episode,an anomalous cyclonic(anticyclonic) circulation over the western Pacific and South China weakens(enhances) the monsoonal northward flow in the lower troposphere;meanwhile,anomalous meridional circulation connects the descending(ascending) branch over the Southeast Indian Ocean and the ascending(descending) branch in South China as well as a descending(ascending) branch over North China.Analysis of the mechanism behind these features suggests that(1) the accumulation of OHC-induced vorticity is related to the wave activity over the mid-latitudes and that(2) the meridional teleconnection induced by the Indo-Pacific air-OHC interaction appears over East Asia and the western Pacific.Both of these patterns can cause summer precipitation anomalies in China.
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| 关 键 词： | oceanic heat content summer precipitation interannual variability tropical Indian Ocean |
| 修稿时间： | 5/9/2012 12:00:00 AM |
Relationship Between Upper-Ocean Heat Content in the Tropical Indian Ocean and Summer Precipitation in China |
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| HUANG Ke,ZHANG Qi-Long,XIE Qiang,WANG Dong-Xiao.Relationship Between Upper-Ocean Heat Content in the Tropical Indian Ocean and Summer Precipitation in China[J].Atmospheric and Oceanic Science Letters,2012,5(4):306-313. |
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| Authors: | HUANG Ke ZHANG Qi-Long XIE Qiang and WANG Dong-Xiao |
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| Institution: | State Key Laboratory of Tropic Oceanography (LTO), South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sciences, Guangzhou 510301,Graduate University of Chinese Academy of Sciences, Beijing 100049;Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071;State Key Laboratory of Tropic Oceanography (LTO), South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sciences, Guangzhou 510301,Sanya Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572099;State Key Laboratory of Tropic Oceanography (LTO), South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sciences, Guangzhou 510301 |
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| Abstract: | An analysis of the Ishii ocean heat content (OHC) in the tropical Indian Ocean from the surface to 700-m depth shows that the OHC changes dramatically on the interannual timescale in the Indian Ocean. The first mode of empirical orthogonal function (EOF1) of the OHC shows that there is a strong air-sea interaction pattern in the Indian Ocean with a positive (negative) loading in the east and a negative (positive) loading in the west. This seesaw oscillation pattern influences the summer precipitation in China with a North-South reversed distribution. Composite analysis shows that during a positive (negative) OHC episode, an anomalous cyclonic (anticyclonic) circulation over the western Pacific and South China weakens (enhances) the monsoonal northward flow in the lower troposphere; meanwhile, anomalous meridional circulation connects the descending (ascending) branch over the Southeast Indian Ocean and the |
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| Keywords: | oceanic heat content summer precipitation interannual variability tropical Indian Ocean |
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