RELATIONSHIP AMONG THE NORTHERN HEMISPHERE ANNUAL MODE, THE NORTHEAST CHINA COLD VORTEX AND PRECIPITATION DURING THE FIRST YEARLY RAINY PERIOD IN SOUTH CHINA
RELATIONSHIP AMONG THE NORTHERN HEMISPHERE ANNUAL MODE, THE NORTHEAST CHINA COLD VORTEX AND PRECIPITATION DURING THE FIRST YEARLY RAINY PERIOD IN SOUTH CHINA
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DOI：
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发表时间：
2006
影响因子：
1.2
通讯作者：
Miao Chun
中科院分区：
文献类型：
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作者：
Miao Chun
利用国家气候中心提供的1951-2004年中国160个测站的月降水量和月气温资料、ECMWF提供的ERA-40资料（分辨率为2.5°×2.5°）再分析资料和Reynolds海表温度资料（分辨率为2.0°×2.0°），分析了北方年模态（NAM）、本文对东北冷涡（NECV）与华南前汛期降水的关系进行了统计分析，并定义了一个季节时间尺度（5 ~ 6月）的东北冷涡指数（NECVI）。结果表明，华南地区前一年多雨期NECV与降水量呈显著正相关，NECV强则降水量多，NECV弱则降水量少。在第一个雨季，一个非常强的NECV通常在前一年的2月和3月看到一个弱的NAM，而一个弱的NECV通常与一个强的NAM有关。此外，NECV与中国近海沃茨的表层海温（SST）存在显著的负相关关系。前期NAM和中国近海海温对NECV和华南前汛期降水有一定的预报意义。
Based on the 1951-2004 monthly precipitation and surface air temperature of 160 Chinese stations supplied by National Climatic Center, the reanalysis data from ERA-40 datasets supplied by ECMWF with resolution 2.5°×2.5°and the Reynolds sea surface temperature (SST) data with a resolution of 2.0°×2.0°, the relationship among the Northern Hemisphere annual mode (NAM), the Northeast China cold vortex (NECV) and the rainfall during the first yearly rainy period in South China has been investigated statistically and a seasonal time-scale (May-June) Northeast cold vortex index (NECVI) for the first yearly rainy period has been defined. Results demonstrate that there is significantly positive correlation between the NECV and the precipitation during the first yearly rainy period in South China, with strong NECV related to more precipitation, and vice versa. An anomalously strong NECV in the first yearly rainy period often sees a weak NAM during the previous February and March, whereas a weak NECV is usually connected with a strong NAM. In addition, the NECV has an anomalously negative relationship with the precursory sea surface temperature (SST) in offshore waters of China. The previous NAM and the SST off the coast of China might offer some predictive signals for the NECV and the precipitation in South China during the first yearly rainy period.