摘要
从动力上推导了热力、质量强迫下的湿位涡方程 ,阐明了在暴雨系统中引起的强降水会造成热力、质量强迫下的湿位涡异常。并用NCEP 1°× 1°的分析资料对 1 999年 6月 2 3日到6月 2 6日引起长江流域暴雨的对流系统进行了湿位涡诊断分析 ,分析结果表明湿位涡异常高度主要出现在 70 0～ 5 0 0hPa之间 ,中心最大值可超过 1 .4PVU。从动力和资料诊断两个方面均揭示出湿位涡异常区与强降水区有很好的对应关系。
The moist potential vorticity (MPV) equation with both heat and mass forcings is derived. It is clarified that both heat and mass forcings induced by the intensive precipitation in torrential rain systems can lead to moist potential vorticity anomaly. With NCEP/NCAR 1°×1° data, the moist potential vorticity anomaly is diagnosed along the Yangtze River from June 23 to June 26 1999. The results indicate that moist potential vorticity anomaly occurs between 700 hPa and 500 hPa, and the maximum anomaly value is up to 1.4 PVU. Both dynamical and diagnostic methods reveal that moist potential vorticity anomaly regions correspond well to the regions of intensive precipitation.
出处
《应用气象学报》
CSCD
北大核心
2002年第6期662-670,共9页
Journal of Applied Meteorological Science
基金
国家重点基础研究发展规划项目"我国重大天气灾害的形成机理和预测理论研究"(G1 9980 40 90 7)
国家基金委资助 (资助号 40 0 3 5 0 1 0 )
关键词
强暴雨系统
湿位涡
热力强迫
质量强迫
长江流域
Moist potential vorticity (MPV) Heat forcing Mass forcing Torrential rain
