摘要
利用常规观测资料、地面加密资料和FY-2产品对济南市"7.18"大暴雨的天气形势、云图演变特征及中尺度系统发生、发展和移动的情况进行了分析。结果表明:地面的中尺度辐合中心和中尺度辐合线是造成此次大暴雨的直接原因;强降水发生在中尺度低压中心附近,随其移动而移动;在减弱的云团右后方不断有新的云团生成,从γ尺度发展到β尺度,水汽条件充足时发展成边界清晰、结构密实的α尺度;大暴雨中心与云顶亮温TBB的最低值中心及强度有密切关系;FY-2产品在大暴雨临近预报中发挥着重要作用。
With the conventional and intensive observation data and FY-2 satellite products, the mesoscale convective systems （MCSs） that caused the ＂7.18＂ severe heavy rain over Jinan are analyzed. The meso-scale convergence center and line played important roles. Furthermore, the severe heavy rain occurred near the center of meso-scale low pressure and accompanied with them. The new cloud clusters which generated behind the right rear of the weakened clouds developed from meso-γ to meso-β scale. Under enough vapor conditions, they expanded into compacted α-scale clouds with a clear edge that directly caused the severe heavy rain. The maximum precipitation was strongly related to the lowest TBB measured by FY-2 satellite, therefore, FY-2 satellite products is very important in nowcasting.
出处
《气象》
CSCD
北大核心
2008年第1期27-34,共8页
Meteorological Monthly
