摘要
对福建省三明各县(市)1961-2008年汛期(5、6月份)的降水资料进行统计分析,揭示汛期雨量特多、特涝和异常偏涝年份的时间、地域分布特征和周期演变规律;用500hPa月平均高度场资料分析了2005年汛期异常偏涝的环流特征,并就2005年汛期异常偏涝与历史上特涝年的环流形势进行了对比分析。结果表明:5、6月份由于东亚大槽明显偏东,副高面积大、强度强,脊线明显偏南,印缅槽强度偏强,导致西风槽非常活跃,不断东移、南压,这是造成2005年三明各县(市)汛期异常偏涝的主要原因;5、6月份由于逐日副高脊线位置适中、稳定,导致三明各县(市)汛期开始早、结束迟、持续时间长,这是造成2005年汛期异常偏涝的原因之一。
After the statistics and analysis of precipitation data in raining season （May and June） in Sanming from 1961 to 2008, the temporal-spatial distribution and dynamic regularity of the precipitation particularly much and abnormal water-logging in raining season were discovered. Using 500 hPa monthly average level data to analyze the circulation in raining season in 2005, and the abnormal water-logging circulation in raining season in 2005 was contrasted with that in the particularly water-logging year in history. The results showed that the main reason of the abnormal water-logging in raining season in Sanming in 2005 was that the west trough was animating and moving continually eastward and southward in May and June, because east-Asia trough was obviously located to east and subtropical high was large, strong and obviously located to south and India-Myanmar trough was stronger than the average level. Another reason was that the daily position of subtropical high was stable and middle in May and June which made the raining season started early, ended late and lasted long.
出处
《亚热带农业研究》
2009年第1期44-49,共6页
Subtropical Agriculture Research
基金
2008年三明市气象局课题(第7号)
关键词
汛期特涝年
气候特征
分析
particularly water-logging in raining season
climate characteristics
analysis
