Tropical Indian Ocean Basin Warming and East Asian Summer Monsoon: A Multiple AGCM Study
Tropical Indian Ocean Basin Warming and East Asian Summer Monsoon: A Multiple AGCM Study
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热带印度洋盆地变暖和东亚夏季风：多重 AGCM 研究
DOI：
10.1175/2008jcli2433.1
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发表时间：
2008-11-15
影响因子：
4.9
通讯作者：
Hu, Kaiming
中科院分区：
文献类型：
--
作者：
Li, Shuanglin;Lu, Jian;Hu, Kaiming
海盆尺度变暖是热带印度洋海表温度年际变化的主导模态，也是近几十年来热带印度洋海表温度年代际变化趋势的显著特征。通过几个大气环流模式的集合试验，研究了全球变暖对东亚夏季风的影响。5个AGCM的结果一致表明，在近地面，印度洋变暖迫使副热带西太平洋出现反气旋异常，加强了中国东部的西南风;在对流层上层，印度洋变暖迫使南亚高压加强，这两种情况都有利于东亚夏季风的增强。这些过程被认为有助于更强的东亚夏季风在夏季厄尔尼诺高峰后比季风在其他年份。这些模式的结果还表明，热带印度洋变暖可能没有因果关系的年代际时间尺度上的东亚夏季风的同步减弱。
A basin-scale warming is the leading mode of tropical Indian Ocean sea surface temperature (SST) variability on interannual time scales, and it is also the prominent feature of the interdecadal SST trend in recent decades. The influence of the warming on the East Asian summer monsoon (EASM) is investigated through ensemble experiments of several atmospheric general circulation models (AGCMs). The results from five AGCMs consistently suggest that near the surface, the Indian Ocean warming forces an anticyclonic anomaly over the subtropical western Pacific, intensifying the southwesterly winds to East China; and in the upper troposphere, it forces a Gill-type response with the intensified South Asian high, both favoring the enhancement of the EASM. These processes are argued to contribute to the stronger EASM during the summer following the peak of El Nino than monsoons in other years. These model results also suggest that tropical Indian Ocean warming may not have a causal relationship to the synchronous weakening of EASM on interdecadal time scales.