2007年7月8-9日淮河流域特大暴雨过程MCS观测分析

摘要

Using radar, satellite, available intensive observations, rawinsonde data and NCEP daily reanalysis data, the evolution character- istics and affecting systems of the MCSs producing heavy rain in Huaihe valley from July 8 to 9 in 2007 are analyzed. The results show the ex- cessive heavy rain is caused by three MCSs, and their modes are Training line/Adjoining stratiform MCS, Leading stratiform MCS and Embed- ded Line MCS respectively. The radar echoes for those MCSs are organized well, and some MCSs are moving, others are quasi-stationary. The echo distributions of MCSs indicate the precipitation areas. The corresponding synoptic conditions of MCSs are cold front and inverted trough, the frontal surface and surface convergence line respectively. Corresponded with the wind, field the flow field or height flied in low-middle troposphere represents two low vortexes. As the development of the vortexes, the areas where MCSs occurred are corresponding to the flow convergence areas%利用多部雷达组合反射率因子拼图资料、地面自动站加密资料及NCEP1°×1°每日4次再分析资料，分析2007年7月8-9日淮河流域特大暴雨过程中MCS活动及其影响系统和降水特征。结果表明，该过程主要由3次线状MCSs活动造成，其分别为邻接层状单向发展MCS、前导层状MCS和镶嵌带状MCS；雷达组合反射率因子图上，MCS表现为回波组织性强、模态清晰，或移动，或静止，MCS雷达回波分布特征决定雨带走向和落区；3次MCSs活动分别对应地面图上不同的天气影响系统，第一次邻接层状单向发展的MCS主要受地面弱冷锋和低压倒槽影响，第二次前导层状降水MCS受强的锋面影响，第三次镶嵌带状MCS由地面风场上辐合线造成，与之对应的对流层中低层流场或高度场上表现为两次低涡活动，随低涡演变，MCS生成区对应气流辐合区。