| WANG Tianyu,DU Yan,LIAO Xiaomei. 2017. The regime shift in the 1960s and associated atmospheric change over the southern Indian Ocean. Acta Oceanologica Sinica, 36(1):1－8 |
| The regime shift in the 1960s and associated atmospheric change over the southern Indian Ocean |
| 南印度洋SST在20世纪60年代的年代际转变及其相关气候变化过程 |
| Received:December 17, 2015 Revised:March 21, 2016 |
| DOI：10.1007/s13131-017-0987-1 |
| Key words:sea surface temperature regime shift southern Indian Ocean interdecadal variabilities linear trend |
| 中文关键词: 海表面温度 转变 南印度洋 年代际变化 线性趋势 |
| 基金项目:The National Natural Science Foundation of China for Distinguished Young Scholars and Innovative Research Groups under contract Nos 41525019 and 41521005; the Project of the State Oceanic Administration of China for Global Climate Change under contract No. GASI-IPOVAI-02; the CAS/SAFEA International Partnership Program for Creative Research Teams. |
| Author Name | Affiliation | E-mail | | WANG Tianyu | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | DU Yan | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | duyan@scsio.ac.cn | | LIAO Xiaomei | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China | |
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| Abstract: |
| The change of sea surface temperature (SST) in the southern Indian Ocean (SIO) during the recent six decades has been analyzed based on oceanic reanalysis and model, as well as atmospheric data. The results show that a thermal regime shift in SIO during the 1960s, which is not caught enough attentions, has been of equal magnitude to the linear warming since 1970. Empirical Orthogonal Function (EOF) analyses reveal that a thermal shift is combined with atmospheric changes such as the weakening of westerly during the period of 1960-1967. Inner dynamic connections can be defined that when the westerly winds turn weak, the anticyclonic wind circulation between westerly winds and the trade winds decreases, which further reduces the SST to a negative peak in this period. It is noted that the shifts in the 1960s are also evident for Southern Hemisphere. For example, subtropical high and the entire westerly winds belt at high latitudes both change dramatically in the 1960s. This large-scaled process maybe link to the change of southern annular mode (SAM). |
| 中文摘要: |
| 本文基于海气再分析和模式资料，研究了近60年来南印度洋的海表面温度的变化特征。结果表明，南印度洋在上世纪60年代期间的年代际转变与70年代之后的持续增暖在数值上有相同的量级，而关于前者的研究尚不充分。分析结果表明南印度洋的年代际转变伴随着天气要素变化如西风带的减弱。其内在动力机制为当西风减弱时,西风带与信风带之间的反气旋环流则随之减弱，进而冷却海表面温度。值得注意的是，60年代的年代际转变不仅发生在南印度洋，也发生在整个南半球，体现在副热带低压和整个高纬度西风带的变化，这种南半球大规模的激变与南极环状模的调整密切相关。 |
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