热带OLR异常的遥相关结构及其季节变化

The Teleconnection Structure of Outgoing Longwave Radiation Anomalies in Tropics and Its Seasonal Variation

本文用单点相关研究了1月和7月热带OLR异常的遥相关结构及其季节变化。结果表明，热带纬带（15°N-15°S）遥相关型具有纬向偶极结构和准驻波性。1月遥相关具有热带波数2的结构，它反映了东非（赤道中太平洋）和南美（热带西太平洋）之间的非绝热加热异常存在翘翘板（Seesaw）关系；7月遥相关呈热带1波型，它同全球最强的行星尺度热源异常的东西振荡相联系。遥相关型对季节变化的敏感性主要表现为全球热带纬带几个热源（汇）区强度变化和纬向位移，以及东非的遥相关在6－9月符号变异，并由此引起遥相关型从冬到夏从波数2向波数1的转换。这同热带太平洋海气相互作用和南亚夏季风活动有关。

In this paper, the teleconnection structure of OLR anomalies in tropics in January and July and itsseasonal variation of monthly teleconnection pattern are studied. It is shown that the teleconnectionpatteru in the tropical low-latitlldes appears the structure of zonal dipole and quasi-stationary wavefeature. The result is related to the air-sea interaction in the tropical Pacific and the action of summermonsoon over South Asia.