南海西南季风多时间尺度变化及其与海温的相互作用

THE MULTI-TIME SCALE VARIATIONS OF SUMMER MONSOON OVER SOUTH CHINA SEA AND ITS INTERACTION WITH SST ANOMALY

摘要: 利用NCEP再分析资料和OLR、SST观测数据, 研究了南海地区西南季风的多时间尺度变化特征, 对比分析了强弱西南季风年大气环流的差异. 南海西南季风的强弱变化与海表面温度 (SST) 之间存在显著的相互作用, 年际或以上时间层次变化主要表现为南海西南季风强弱与东太平洋海温、南海-阿拉伯海海温存在显著负相关.对月季时间层次, 东太平洋海温变化对西南季风强度变化的影响仍起重要作用, 南海-阿拉伯海海温与西南季风之间相互作用不但表现为西南季风对海温的作用 (西南季风强 (弱) 导致后期海温降低 (升高)), 同时海温变化对西南季风也起相当重要的作用, 前期海温正 (负) 距平有利于西南季风增强 (减弱).

Abstract: Using reanalyzed data of NCEP and observational data of OLR and SST, the features of multi-time scale variations of summer monsoon are studied, and the differences of the atmospheric circulation between strong and weak summer monsoon years are analyzed. It is shown that there exists obvious interplay between the summer monsoon variation over the South China Sea and SST, and meanwhile the variation of SST has a certain effect on summer monsoon.