Is the interdecadal variation of the summer rainfall over eastern China associated with SST?
Is the interdecadal variation of the summer rainfall over eastern China associated with SST?
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中国东部夏季降水的年代际变化与海温有关吗？
DOI：
10.1007/s00382-015-2574-5
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发表时间：
2015
期刊：
影响因子：
4.6
通讯作者：
Han Rongqing
中科院分区：
文献类型：
--
作者：
Si Dong;Hu Zeng-Zhen;Kumar Arun;Jha Bhaskar;Peng Peitao;Wang Wanqiu;Han Rongqing
研究了中国东部夏季降水的年代际变化特征及其与海表温度的关系。IVRC的第一个主导模态（占总方差的近一半，对华南夏季降水异常的负荷最大）可能不受SST的强迫。而第二、三主导模态（分别占总方差的17.1%和13.6%）则在一定程度上受海温异常的强迫，主要与长江流域和华北地区夏季降水异常有关。这些观测结果得到了大气环流模式（AGCM）的证实。通过集合平均剔除内部动力过程驱动的降水，模拟结果进一步表明，在相应的集合平均中，IVRC的强度总体上增强，特别是在YRV和华北地区，而不是在华南地区。这意味着SST在不同地区驱动IVRC的作用不同。
The present study examined the major features of the interdecadal variation of the summer rainfall over eastern China (IVRC) and the possible association with sea surface temperature (SST). We noted that the first leading mode of IVRC (accounting for nearly half of the total variance and with maximum loading for the summer rainfall anomalies over South China) may be not forced by SST. On the other hand, the second and third leading modes [accounting for 17.1 and 13.6 % of the total variance and mainly associated with the summer rainfall anomalies over the Yangtze River valley (YRV) and North China, respectively] in some extent are forced by SST anomalies. These observational results are confirmed by atmospheric general circulation model (AGCM) simulations forced by observed SST. By eliminating the internal dynamical process driven rainfall though ensemble mean, the simulations further suggest an overall enhancement of the intensity of IVRC in the corresponding ensemble mean, especially in the YRV and North China regions, but not in South China. That implies the different role of SST in driving IVRC over different regions.
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