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Relationship Between Upper-Ocean Heat Content in the Tropical Indian Ocean and Summer Precipitation in China
  • 分类:P434.4[天文地球—大气科学及气象学] P732[天文地球—海洋科学]
  • 作者机构:[1]State Key Laboratory of Tropic Oceanography (LTO), South China Sea Institute of Oceanology (SCSIO), Chinese Academy of Sci-ences, Guangzhou 510301, China, [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China, [3]Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China, [4]Sanya Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572099, China
  • 相关基金:Acknowledgments. The authors thank Weiqiang WANG and Ju CHEN for their helpful comments and discussions during the course of this work. This work is 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), the National Founda- tion 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 Pro- gram of the Chinese Academy of Sciences (Grant No. KZCX2-YW- Qll-02), and the National Natural Science Foundation of China (Grant No. 40906010).
中文摘要:

在到 700-m 深度的从表面的热带印度洋的 Ishii 海洋热内容(OHC ) 的分析证明 OHC 在印度洋在 interannual timescale 上戏剧性地变化。OHC 的实验直角的功能(EOF1 ) 的第一个模式证明在印度洋与有一个强壮的由空至海的相互作用模式一积极(否定) 在东方装载并且一否定(积极) 在西方装载。这个跷跷板摆动模式与纵贯的颠倒的分布在中国影响夏天降水。合成分析显示出那在期间一积极(否定) OHC 事件,一异常气旋(逆旋风) 在西方的太平洋和华南上的循环变弱(提高) monsoonal 向北方流动在更低的对流层;同时,异常南方的循环连接下降(上升) 在东南印度洋并且上升上的分支(下降) 在象下降一样的华南的分支(上升) 在诺思中国上的分支。在这些特征后面的机制的分析建议(1 )导致 OHC 的涡度的累积与波浪活动有关完了中间纬度并且(2 ) 南方的 teleconnection 由 Indo 和平的 air-OHC 相互作用导致了,这出现在东亚和西方的太平洋上。这两个模式能在中国引起夏天降水异例。

英文摘要:

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 pat- tern 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 distri- bution. Composite analysis shows that during a positive (negative) OHC episode, an anomalous cyclonic (anti- cyclonic) circulation over the western Pacific and South China weakens (enhances) the monsoonal northward flow in the lower troposphere; meanwhile, anomalous merid- ional circulation connects the descending (ascending) branch over the Southeast Indian Ocean and the ascending (descending) branch in South China as well as a descend- ing (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 me- ridional teleconnection induced by the Indo-Pacific air-OHC interaction appears over East Asia and the west- ern Pacific. Both of these patterns can cause summer pre- cipitation anomalies in China.

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