东亚夏季低层大气环流对东海及其邻近海域海温异常响应的数值试验

Numerical experiment of East Asian summer lower atmosphere circulation responses to SST anomalies in East China Sea and its adjacent seas

利用NCEP/NCAR的再分析资料、全球海温资料(OISST)及区域气候模式(RegCM3)研究了东亚夏季低层(925hPa)大气环流对东海及其邻近海域热力异常的响应.结果表明,夏季,当东海及其邻近海域的海温升高0.5和1.0℃时,在中国东部和东海及其邻近海域上空均会出现一个异常的气旋性环流,而且海温越高,气旋性环流越明显,并在海面上空形成辐合中心;反之,当东海及其邻近海域海温降低时,中国东部和东海及其邻近海域上空将出现一个异常的反气旋性环流,并在海面上空形成辐散中心.东海及其邻近海域夏季海温的异常可通过热力作用影响低层大气的辐合(散)和垂向运动,并影响局地低层大气和上层海洋的相互作用,从而使得东亚大气环流发生改变,进而可能对中国大陆东部气候和近海环境的变化产生重要作用.

Regional climate model RegCM3 is used to investigate the responses of East Asian summer lower（925 hPa） atmosphere circulation to sea surface temperature（SST） anomalies in East China Sea and its adjacent seas（ECS） based on the NCAR/NCEP reanalysis data and optimum interpolation sea surface temperature（OISST）.Results show that,when SST in ECS rises 0.5 and 1.0℃ in summer,an anomalous cyclonic circulation will appear over the Eastern China and East China Seas,and with the warmer SST,the stronger cyclonic circulation;opposite circumstances will appear with the below-normal SST.Therefore,it is suggested that the responses of East Asian atmosphere circulation to SST anomalies in ECS and the local air-sea interaction can be affected by the convergence/divergence of lower atmosphere due to SST anomalies in ECS.Furthermore,Eastern China regional climate and marine environment and ecology system of China offshore may also be impacted.