摘要
南海夏季风槽是南海夏季风的重要组成部分,它的活动不仅对大气环流和气候有明显影响,其本身也具有明显的年际变化特征。首先定义了一个描写南海夏季风槽强度的指数,然后分别对强、弱南海夏季风槽年的例子进行了合成分析。分析结果表明,对应强、弱不同的南海夏季风槽年份,在大气环流背景、对流活动以及海温背景场方面都有很明显的区别,说明南海夏季风槽的异常不是偶然的,有其十分明显的大背景。合成分析的结果还表明,南海夏季风槽的强弱异常不仅对中国夏季降水有重要影响,还会通过遥相关过程影响北半球的其他区域。
The South China Sea summer monsoon trough （SCSSMT） is an important part of the South China Sea summer monsoon system. It has distinct characteristics of interannual variation, which has important impacts on the summer circulation of China. In this paper, an intensity index of SCSSMT is brought forward first. Then strong and weak monsoon trough years are classified according to the index, and different variables of the background circulations associated with strong/weak monsoon trough years are synthesized. The synthesized results show that there exist quite different background fields, such as general atmospheric circulation, convective actions and SST in different monsoon trough years. It can be conferred that the monsoon trough anomaly, that is, anomalous strong/weak monsoon trough, is connected to the background fields. The impact of the monsoon trough anomaly on the precipitation of China is also discussed, which shows that anomalous South China Sea summer monsoon trough not only influences the precipitation in China, but also makes a remote impact on the circulation of the other areas in the Northern Hemisphere through telecormection process.
出处
《大气科学》
CSCD
北大核心
2007年第6期1049-1058,共10页
Chinese Journal of Atmospheric Sciences
基金
中国科学院创新项目KZCX3-SW-226
国家自然科学基金资助项目40675051
国家重点基础研究发展规划项目2006CB403600
关键词
南海夏季风槽
年际变化
影响
夏季降水
波列
the South China Sea summer monsoon trough, interannual variation, summer rainfall, wave train
