2003年和2006年江淮流域梅雨期暴雨大尺度特征对比分析  

Comparative Analysis on the Large Scale Characteristics of Heavy Rainstorm During Meiyu Period of 2003 and 2006

作　　者：尹东屏[1] 曾明剑[1] 吴海英[1] 赵凯[1] 孙燕[1] 

机构地区：[1]江苏省气象台,南京210008

出　　处：《气象》2008年第8期70-76,共7页Meteorological Monthly

摘　　要：2003年和2006年梅雨期有许多相似之处：出梅日和入梅日一致；副热带高压脊线在15～27°N之间摆动；梅雨期暴雨量集中在淮河流域、洪泽湖周边及里下河地区，但2003年梅雨总量却大于2006年。利用T213分析场资料，采用合成平均对比分析的方法，对2003年和2006年江苏江淮流域梅雨期暴雨在天气形势、热力条件和动力条件等方面进行了较深入的分析。得到：（1）2003年梅雨锋区强于2006年；（2）2003年梅汛期暴雨具有较强盛的水汽输送、涡散度中心重叠、上升气流强盛等有利条件。（3）2003年强对流天气产生的暴雨少于2006年。分析表明，梅雨期梅雨量的增幅与物理量的增量成正比关系。There are several similar characteristics in Meiyu period of 2003 and 2006. For example, the date of beginning and ending of Meiyu was consistent in above two years, the subtropical high ridge of Meiyu period of the two years also oscillated between 15°N and 27°N, and the heavy rainstorm during Meiyu period of the two year concentrated in Huaihe valley, Hongze lake and Lixiahe area of Jiangsu. But the total precipitation of Meiyu period in 2003 was more than that in 2006. The synoptic situation and conditions of thermodynamics and dynamics which accompanied with heavy rainstorm during Meiyu period of 2003 and 2006 in Jianghuai valley of Jiangsu are analyzed in details by using the T213 analysis data and composite average method. The results show that Meiyu front of 2003 is stronger. In addition, the stable moisture transportation, overlapping center of convergence and vorticity and vigorous ascending stream in 2003 were also favorable conditions for the Meiyu. The number of heavy rainstorm day caused by strong convective system in 2006 was more than in 2003. The results also indicate that the rainfall amount in the period of Meiyu is proportional to the increment in the physical quantity.

关 键 词：副热带高压 暴雨 合成 物理量 对比分析 

分 类 号：P442[天文地球—大气科学及气象学] P426.616