Local rainfall‐SST relationship on subseasonal time scales in satellite observations and CFS
Local rainfall‐SST relationship on subseasonal time scales in satellite observations and CFS
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DOI：
10.1029/2008gl035883
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发表时间：
2008-11
影响因子：
5.2
通讯作者：
R. Wu;B. Kirtman;K. Pegion
中科院分区：
文献类型：
--
作者：
R. Wu;B. Kirtman;K. Pegion
本研究基于卫星观测和气候预报系统(CFS)，记录了热带印度洋-西太平洋地区亚季节时间尺度上的局地降雨量-海温关系。结果表明，亚季节海气耦合的强度强烈依赖于季节，其中以夏半球的相互作用最为明显。降雨量与海温的时间滞后具有明显的空间变异性和不对称性。在观测中，与强迫大气的大气区域相比，强迫海温的大气区域倾向于向亚热带地区转移。在CFS中，强迫SST的大气区域往往与强迫大气的SST区域配置在一起。CFS相当好地捕捉到了海-气耦合强度的季节性，但可能高估了耦合强度。与观测相比，中心的海温对大气的响应需要更长的时间。
The present study documents local rainfall‐SST relationship on subseasonal time scales in the tropical Indo‐western Pacific region based on satellite observations and the Climate Forecast System (CFS). It is found that the intensity of subseasonal air‐sea coupling strongly depends on the season with most prominent interaction in the summer hemisphere. The time lag between rainfall and SST displays pronounced spatial variations and asymmetric feature. In observations, the regions of the atmosphere forcing the SST tend to shift to subtropics compared to those of the SST forcing the atmosphere. In the CFS, the regions of the atmosphere forcing the SST tend to be collocated with those of the SST forcing the atmosphere. The CFS captures reasonably well the seasonality in the intensity of air‐sea coupling, but probably with an overestimation of the coupling strength. The SST response to the atmosphere takes longer time in the CFS compared to observations.