摘要
用江苏省地基GPS水汽监测系统得到的大气可降水量(PWV)资料,对江苏地区2009年夏季一次强对流性天气产生的降水过程进行了综合分析,分析了各时段GPS-PWV的变化特征和水汽的输送特点,并利用WRF中尺度数值模式对此次过程进行了数值模拟。结果表明:GPSPWV对于空中水汽变化具有很高的敏感性,能及时地反映大气中水汽的时空变化。通过对数值模式结果进行分析后,发现强盛的水汽输入及辐合上升、中高层弱冷空气的侵入活动、低层西南气流加强、对流不稳定层加剧等多种因素的共同作用是造成此次中小尺度对流性降水的主要原因。GPS-PWV提供的精确水汽变化结合数值模式所模拟出的动力、热力条件对于强对流性暴雨预报和降水区域判定具有较好的参照意义。
GPS-PWV from Jiangsu ground-based GPS water vapor monitoring system was used to an- alyze a severe convective weather process happened in summer of 2009 in Jiangsu province, as well as the variation of GPS-PWV at each period and the characteristics of water vapor transportation. Numerical simulation of this process with WRF model shows GPS-PWV is quite sensitive and timely reflects the water vapor change. Results of numerical simulation analysis based on WRF model suggests that the strong con- vective storm is caused by the interaction of strong vapor and convergence ascending motion, weak cold air activities at middle levels, the strengthening southwest low-level jet and the weakening stability of con- vection layer, etc. The precise variation of water vapor provided by GPS-PWV and the thermal and dy- namic condition simulated by numerical simulation can be combined to forecast the strong convective storm and precipitation areas well.
出处
《气象科学》
CSCD
北大核心
2013年第5期492-499,共8页
Journal of the Meteorological Sciences
基金
高校博士点专项科研基金(20093228110002)
江苏省高校自然科学重大基础研究项目(10KJA170030)
灾害天气国家重点实验室开放课题(2010LASW-A01)
北极阁基金(BJG201001)
江苏省2011年度普通高校研究生科研创新计划项目(CXZZ11_0617)
关键词
卫星云图
GPS
PWV
强对流降水
WRF模拟
Satellite image
GPS-PWV
Severe convective precipitation
WRF model simulation
