基于ISCCP数据集的梅雨期影响浙江省及周边地区的对流系统特征分析

基于国际卫星云气候计划（international satellite cloud climate program，ISCCP）1998—2007年10 a深对流路径跟踪资料数据集，统计分析了梅雨期影响浙江省及周边地区的对流系统（convection system，CS）的空间、时间分布特征。从空间分布看，梅雨期影响浙江省及周边地区的CS主要来源于区域本地，且50%以上为短时对流过程，其次来源于西南、西北区域，定量统计源地发生个数，发现存在多个高发区域，与山区地形有较好的对应关系；进一步，用云顶最低温减小表征系统加强，发现江西省北部与安徽省、湖北省、浙江省交界处易发生系统加强过程；通过统计分析不同区域CS发生的初始时刻，发现CS白天发生次数稍大于晚上，并呈一定的日变化特征，且9：00（UTC）是CS初始高发时刻。

Characteristic analysis of deep convective systems of Zhejiang and surrounding areas during meiyu period based on ISCCP data

The tracking data of deep convection from 1998 to 2007 provided by the international satellite cloud climate program (ISCCP) are used to analyze the spatial and temporal distribution of the convective systems (CS) in Zhejiang and its surrounding areas during Meiyu period.The results show that theses CS mainly come from the local area,and more than 50% involve only short-term convection process,secondly from the Southwest and Northwest regions. When referring to the quantitative statistics of the source region,there are four high-risk areas which have good corresponding relationship with mountainous terrain. Further,by regarding the decrease of CS minimum cloud temperatures as the strengthening of the system,we find that around northern Jiangxi and Anhui,Hubei,Zhejiang junction, the system is likely to strengthen,According to the statistics of the initial time of CS system at different regions,it can be found that the day is slightly higher than during the night,with a certain diurnal variation,and 09:00 (UTC) was the initial high occurrence moment of convective process.