2006年长江中下游地区梅雨季节划分的探讨

为了建立长江中下游地区梅雨季节的新样本,采用以环流为主导的常规方法,利用NCEP/NCAR逐日再分析资料及长江中下游5站降水资料,对2006年长江中下游地区梅雨季节的特征量进行了诊断分析,并讨论了梅雨与夏季风的关系。结果表明,将6月5候和7月4候分别划为2006年长江中下游地区梅雨季节的起始和结束时间是较为合适的;2006年长江中下游地区梅雨季节对应的梅雨量较常年偏少,这与梅雨季节中印度夏季风和东亚夏季风（包括南海夏季风和副热带夏季风）强度较常年偏弱有关。

An Investigation on the Partition of Mei-Yu Season in the Mid-Lower Reaches of the Changjiang River in 2006

In order to add new Mei-Yu season sample in the Mid-Lower Reaches of the Changjiang River, the daily data of reanalysis from NCEP/NCAR and the precipitation observation of 5 stations in the Mid-Lower Reaches of the Changjiang River are used and some routine methods based on circulation consideration are adopted to diagnose the characteristic parameter of summer Mei-Yu period in the Mid-Lower Reaches of the Changjiang River in 2006, and to discuss the relationship between Mei-Yu season and summer monsoon in that year. The result shows that it is reasonable to ensure that the beginning and ending Mei-Yu season in the Mid-Lower Reaches of the Changjiang River are the 5th pentad of June and the 4th pentad of July respectively, also the total Mei-Yu precipitation of 2006 is below the normal due to the weaker Indo-monsoon and east Asia monsoon (including summer the South China Sea monsoon and summer subtropical monsoon) of that season.