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首页> 外文期刊>Climate dynamics >Coupled intraseasonal variations in the East Asian winter monsoon and the South China Sea-western North Pacific SST in boreal winter
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Coupled intraseasonal variations in the East Asian winter monsoon and the South China Sea-western North Pacific SST in boreal winter

机译：东亚冬季风和北海冬季南海西北太平洋海温的季节内变化

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摘要

The sea surface temperature (SST) in the South China Sea (SCS) displays prominent intraseasonal variations during boreal winter with a spectrum peak in the 10-30-day time period. These intraseasonal SST variations are closely associated with intraseasonal variations of the East Asian winter monsoon (EAWM). A weak EAWM is preceded by cooler SST and followed by warmer SST in the SCS and subtropical western North Pacific. A coherent southward propagation is seen in the SCS in SST, surface wind, and latent heat flux anomalies. This southward propagation is attributed to the wind-evaporation-SST effect under climatological northerly winds in winter, which differs from summer when climatological winds are westerly. The SST-induced wind speed anomalies are larger to the north side of SST anomalies. This induces larger surface evaporation anomalies to the north side, leading to a southward displacement of large SST anomalies. In turn, wind and evaporation anomalies move southward. There appears to be a positive feedback between circulation and precipitation that leads to amplification of meridional wind anomalies when the SST anomalies are weak. Surface latent heat flux is a dominant factor for the SST change in the SCS and the Yellow Sea. Shortwave radiation has a complementary contribution to the SST change in the SCS, but has a negative effect in the Yellow Sea. The wind-induced Ekman advection appears important for the SST warming in the Yellow Sea.
机译：南海（SCS）的海表温度（SST）在寒冬期间表现出明显的季节内变化，并在10-30天的时间段内出现频谱峰值。这些季节内SST的变化与东亚冬季风（EAWM）的季节内变化密切相关。在EAWM减弱之前，南海和北亚热带副热带海温较低，海温较高。在南海中，海表温度，表面风和潜热通量异常中都可以看到一个连贯的向南传播。这种向南传播归因于冬季在气候北风下的风蒸发-SST效应，这与夏季西风的夏季不同。 SST引起的风速异常在SST异常的北侧更大。这在北侧引起较大的表面蒸发异常，导致大型海温异常向南位移。反过来，风和蒸发异常又向南移动。当SST异常较弱时，在环流和降水之间似乎存在正反馈，导致子午风异常放大。表面潜热通量是南海和黄海海温变化的主要因素。短波辐射对SCS中SST的变化具有补充作用，但在黄海中具有负面影响。风力引起的埃克曼对流似乎对黄海海温上升很重要。

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