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20世纪90年代末之后东亚沿岸春季的降温趋势

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Keywords: 表面气温,降温趋势,冰盖,雪盖,冷空气

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Abstract:

揭示了20世纪90年代末之后,全球变暖背景下,东亚沿岸春季的降温趋势.这一降温趋势是可以理解的,其与春季西北太平洋海温(SST)降低和300hPa东亚急流减弱吻合较好.而且,这一降温现象与前秋北极冰盖(SIC)快速减少有关.前秋北极SIC信号可以持续到当年春季,提供较多的水汽来源,使得春季西伯利亚雪盖增加.欧亚雪盖增加可能通过强的辐射冷却和大尺度的下沉运动,致使冷空气南下,间接有利于东亚地区降温.此外,3个气候模式较好地模拟出过去东亚春季的降温,但是其对未来10年春季温度预测是不确定性的.

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