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Relationship Between Upper-Ocean Heat Content in the Tropical Indian Ocean and Summer Precipitation in China |
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| Authors: | HUANG Ke ZHANG Qi-Long XIE Qiang WANG Dong-Xiao |
| Affiliation: | 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 |
| 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 |
| Keywords: | oceanic heat content summer precipitation interannual variability tropical Indian Ocean |
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