摘要
热带中太平洋海温异常型是近年发现的赤道太平洋海温异常分布的新特征,主要表现在热带太平洋海温异常为纬向"三极型"分布,其与ENSO的"偶极型"分布显著不同。利用1955—2005年HadISST月平均海温资料和中国160站月降水和温度资料,确定了中太平洋海温异常型并研究了这种海温异常型与中国东部同期夏季降水的关系。结果表明,当中太平洋海温为正异常时,我国江淮流域、西南地区的东部整层水汽含量偏少并处于水汽通量辐散区,不利于降水的形成,同时该地区上空垂直温度平流为正异常,利于异常高温的形成;我国华南、西南地区的南部为整层水汽通量辐合区,水汽丰沛,且整层垂直温度平流为负异常,易发生低温多雨的天气气候。
Central equatorial Pacific SSTA pattern,which has been observed in recent years,displays new characteristics in tropical Pacific Ocean,which mainly takes on a tripolar distribution pattern and is distinctly different from ENSO.Based on the monthly mean SST data from HadISST and precipitation and temperature data from 160 stations in China,we confirmed the existence of tropical central Pacific SSTA pattern and studied the influence of this pattern on climate in China in summer.The result shows that when SSTA of central Pacific Ocean is positive,the moisture content is lower than normal in Huaihe River and Yangtze River areas in summer,which usually leads to less precipitation.Accordingly,the positive vertical temperature advection of this area causes high temperature.Meanwhile,the situation in the southern and southwest parts of China is just the opposite.
出处
《大气科学学报》
CSCD
北大核心
2010年第5期547-554,共8页
Transactions of Atmospheric Sciences
基金
国家重点基础研究发展计划项目(2006CB403602)
江苏省气象灾害重点实验室资助课题(KLME060101)
关键词
赤道中太平洋
海温异常
夏季气候
中国
central equatorial Pacific Ocean； SSTA； summer climate； China；
