摘要
采用1979—2007年6月NCEP/NCAR2.5°×2.5°逐日再分析资料和中国743站逐日降水资料,利用相关分析、合成分析等方法,分析了天气尺度波列的特征及其对长江中下游6月梅雨的影响。结果表明:当长江中下游6月梅雨较少时,东亚及西太平洋区域存在一个天气尺度波列;该波列的延伸距离较短(从黄河河套地区经过长江中下游至南海、菲律宾海一带),维持时间也很短,且仅仅在500 h Pa以下较强。诊断及个例分析表明,当该波列异常显著时,长江中下游梅雨降水明显减少,而其南部区域降水则增多,说明该波列对预报长江中下游降水具有重要的指示意义。
Based on the NCEP / NCAR daily reanalysis datasets（ 2. 5° × 2. 5°） and the daily precipitation datasets of 743 meteorological stations in China in June during 1979—2007,the characteristics of the synoptic scale w ave train and its impact on M eiyu in the middle and low er reaches of the Yangtze River are investigated by the correlation analysis method,the synthetic analysis method,etc. Results indicate that,w hen the precipitation is less in the middle and low er reaches of the Yangtze River in June,there is a synoptic scale w ave train over East Asia and West Pacific. The w ave train has both shorter duration and extended distance（ from Hetao area of the Yellow River to the middle and low er reaches of the Yangtze River,to South China Sea,and to the Philippine Sea）,and is stronger only below 500 h Pa. Diagnosis and case analyses show that,w hen the w ave train is especially notable,the M eiyu rainfall obviously decreases in the middle and low er reaches of the Yangze River and increases in the south region. It show s that the w ave train has an important indicative significance for the precipitation prediction in the middle and low er reaches of the Yangtze River.
出处
《大气科学学报》
CSCD
北大核心
2016年第1期28-36,共9页
Transactions of Atmospheric Sciences
基金
国家自然科学基金资助项目(41575055
41205060)
公益性行业(气象)科研专项(GYHY201306030)
关键词
梅雨
波列
E-P通量
天气尺度
长江中下游
Meiyu
wave train
E-P flux
synoptic scale
the middle and lower reaches of the Yangtze River
