南海季风型海-气耦合模态的时空特征及其与中国夏季降水的关系  

Spatial-Temporal Characters of the Monsoon-Ocean Coupled Mode over the South China Sea and Its Relation with Summer Precipitation of China

作　　者：黄菲[1] 王宏[1] 戴平[1] 

机构地区：[1]中国海洋大学海洋气象系海-气相互作用与气候实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2007年第3期351-356,共6页Periodical of Ocean University of China

基　　金：国家重点基础研究发展计划(2006CB403603);国家自然科学基金项目(40305009);新世纪优秀人才支持计划(NCET-05-0591)资助

摘　　要：使用NCEP/NCAR的海表温度(SST)、海面10 m风场的月平均再分析资料,用联合SVD(CSVD)的方法研究了不同季节南海的海气耦合模的时空分布特征及其与中国夏季降水的关系。通过对不同季节的海-气耦合模的年际变化特征的分析。结果发现:第一模态为最显著模态,模态协方差贡献比在四季均超过80%,空间上SST表现为与南海等深线相一致的海盆模态,风场上主要表现为弱的冬季风或弱的夏季风,各个季节的海-气耦合模态都主要反映了SST-蒸发-风反馈这样1种正反馈的海-气相互作用过程,而且冬季风期间这种相互作用要更强烈些。时间系数均主要表现为一致的上升趋势和1976年前后的年代际突变,以及与ENSO相关的年际变化特征。冬、夏季弱的季风对应暖SST的特征体现了这种耦合模态隔季相关的特征,都对应夏季华南旱(涝)、江南涝(旱),华北、山东半岛旱(涝),东北涝(旱)这样1种波列状的旱涝相间分布。The spatial-temporal characters of the monsoon-ocean coupled mode （MOCM） over the South China Sea （SCS） and its relation with the summer precipitation of China were studied based on the National Center for Environmental Prediction/National Center for Atmospheric Research （NCEP/NCAR） monthly reanalysis data using combined singular value decomposition （CSVD） method. The analysis on interannual variability of the different seasonal MOCMs showed that the first mode was the most significant leading mode, and its variance contribution exceeded 80 % of the total variance in different seasons. Spatial pattern of the sea surface temperature （SST） appears a basin mode consistent with the isobaths in SCS, while the wind field exhibits a weak winter or summer monsoonal characteristic. The MOCM in different season may reflect a positive SST-evaporation-wind feedback which may be stronger in winter than in other seasons. Time series all show an identical ascending trend and interdecadal break around 1976. Interannual variability related with ENSO is also apparent. The MOCM of weak winter （summer） monsoon with warm SST in SCS corresponds to a flood/drought wave train-like pattern in summer, where drought （flood） is located in the south and north China, while flood （drought） is located at the Yangtze River region and the north-east of China.

关 键 词：南海 海-气耦合模 CSVD 中国夏季降水 

分 类 号：P732.6[天文地球—海洋科学]