大气科学2012，Vol.36Issue(1)：35-46,12.
中国东部夏季降水年际变化与东中国海及邻近海域海温异常的关系
The Relationship between Interannual Variations of Summer Precipitation in Eastern China and the SST Anomalies in the East China Sea and Its Adjacent Seas
摘要
Abstract
The relationship between the interannual variations of summer precipitation in eastern China and the SSTanomalies in the East China Sea and its adjacent seas is analysed by using the methods of composite and correlation analyses and the daily data of summer (June - August) precipitation at 756 stations of China, GPCP 2.1 and HadIS-ST datasets from 1979 to 2008. The results show that when the SST of the East China Sea and its adjacent seas is in warm (cold) anomalies in summer, there are less (more) rainfall in the middle and lower reaches of the Yangtze River and the Yangtze River/Huaihe River valley (Jianghuai valley) and more (less) rainfall in the southern part of Northeast China. Moreover, a regional climate model (RegCM3) is used to examine the above-mentioned relationship. The simulation results indicate that the warm (cold) SST anomalies in the East China Sea and its adjacent seas can contribute to less (more) rainfall in the middle and lower reaches of the Yangtze River, the Yangtze River/Hua-ihe River valley (Jianghuai valley), and most of North China, and more (less) precipitation in South China, the southeast part of Northeast China, and the Korean Peninsula. Besides, the processes of atmospheric circulation variability over East Asia caused by the SST anomalies in these sea regions are explored based on the NCEP/NCAR re-analysis data and numerical simulation. The result shows that increase or decrease of SST in the above-mentioned seas has remarkable effect on zonal and meridional circulations over East Asia. When the SST of the East China Sea and its adjacent seas is above normal, a downward motion with a divergence at low levels and a convergence at upper levels can appear over the middle and lower reaches of the Yangtze Rive and the Yangtze River/Huaihe River valley (Jianghuai valley), and most of North China, which contributes to the decrease of summer rainfall in these areas, in addition to an upward motion with a strong convergence at low levels and a remarkable divergence at upper levels can be caused over the region to the east of these seas. And an upward motion with strong convergence at low levels and remarkable divergence at upper levels is caused in South China, the southern part of Northeast China, and the Korean Peninsula, thus, the summer precipitation increase obviously in these regions. When the SST of the East China Sea and its adjacent seas is below normal, the opposite phenomena appear in the above-mentioned areas. Consequently, it is suggested that the thermal state of the East China Sea and its adjacent seas may be one of the important factors affecting the summer precipitation in East China.关键词
降水/东中国海/海温/气候模式Key words
precipitation/East China Sea/sea surface temperature/climate model分类
天文与地球科学引用本文复制引用
蔡榕硕,谭红建,黄荣辉..中国东部夏季降水年际变化与东中国海及邻近海域海温异常的关系[J].大气科学,2012,36(1):35-46,12.基金项目
公益性行业科研专项经费项目GYHY201006021、GYHY201005192,国家重点基础研究发展计划项目2009CB21400,国家海洋局第三海洋研究所基本科研业务费专项资金(海三科2011009) （海三科2011009）
