大气对海温构型及转换过程的响应——副高进退及异常机理讨论

The Atmospheric Response to SST Patterns and Their Transitions: A Mechanism Discussion on Subtropical High’s Advance/RetreatandAbnormality

用动力学分析和数值计算的方法讨论了大气对热带太平洋几种典型海温分布构型及其转换过程的热力强迫响应。结果表明 :持续的海温热力强迫可以很快激发出稳定的大气平衡态响应 ,La Nina( El Nino)期间的大气位势响应分别利于夏季西太平洋副高增强 (减弱 )和位置偏北 (偏南 )。不同构型的海温转换及转换过程的快慢直接影响大气位势的响应形式 。

Dynamic and numerical methods are used to discuss the atmospheric response imposed by thermal forcing of tropical Pacific typical SST patterns and their transitions. The results show that the duration of SST thermal forcing can quickly excite a stable atmospheric equilibrium state response, the atmospheric response during La Nina is propitious to induce the West Pacific subtropical high strengthening and making its position north, however, the atmospheric response during El Nino is propitious to induce the West Pacific subtropical high weakening and making its position south. The transitions between different SST patterns and their speed influence the atmospheric potential response directly, the abnormality of SST patterns transitions is possibly an important factor of inducing the West Pacific subtropical high abnormity in summer.