中文摘要：

利用20012006年夏季（6--8月）GMS和FY-2气象卫星资料，分析了江淮流域对流云合并的基本特征和规律，以及合并对云体发展的影响。结果表明：（1）夏季江淮流域对流云合并频发，具有典型的时空分布规律，并与夏季雷暴的气候特征有很好的对应关系。首先，江淮流域对流云合并分布与中尺度地形之间有很好的一致性，在区域内有3个高发区：大别山区、皖南山区及洪泽湖-皖东丘陵区域，发生概率分别为28％，23％和16％。其次，对流云合并通常发生在6月末至8月初，并在7月末出现一个峰值。在日变化中，在对流云产生2h后的06：00（世界时，下同）出现一个峰值。（2）在划分的4种合并类型中，两云团或多云团的简单一次合并最多，占87％。（3）对流云合并能明显影响云的发展，80％以上的对流云合并过程中，云团在合并后面积和强度都得到发展，且生命史更长，平均持续时间达6．2h。实况分析表明，对流云合并是引发强降水和强对流天气发生、发展的重要过程。

英文摘要：

GMS and FY--2 satellite data in summer （from June to August） of 2001--2006 were used to analyze the spatial and temporal distribution characteristics and effects of convective cloud merger in Yangtze and Huaihe River basins. The results show that convective cloud merger in Yangtze and Huaihe River basins occurs frequently in summer, which has a typical spatial and temporal distribution characteristics, coinciding very well with the thunderstorm day distribution in Yangtze and Huaihe River Basins. The results are as followings： （1） Cloud mergers in the Yangtze and Huaihe River basins show a distinct spatial grouping associated to mesoscale topography. Three high frequency centers are Dabieshan mountain area with frequencies of 28%, Huangshan mountain area with frequencies of 23% and Hongzehu lake area with frequencies of 16%. （2） Cloud mergers often occur during late June and early August, with a prominent peak during late July. The diurnal variation of cloud mergers shows a peak at 06：00 after 2 h convec- tive cloud initiation. （3） The frequence of simple merger with only one interaction is overwhelming. （4） Merging has a significant effect on cloud system developing. More than 80% merged clouds have apparent increase with enlarging of intensity and area, and lengthening of lifetime.