摘要
利用1994—2013年5—9月喀什气象站逐小时降水资料,分析喀什近20 a降水的日变化特征.研究表明,20时至翌日06时为降水量的高值阶段,最大值出现在01时,07—19时为降水量的低值时段,最小值出现在16时.降水频次的高值区为00时至07时,降水最不易产生的时间为17时.降水强度最高值在20时,次高值为01时,也是累积降水量较大时刻,降水强度最低值出现在15时也是累积降水量的低值区.喀什的降水主要以短时性降水（1-3 h）为主,多发生在傍晚至夜间,1 h降水频次最多的是量级≤1 mm的降水,但1.1 mm≤R1≤3.0 mm量级的降水贡献率最高.小雨、中雨及大雨降水过程最易发生时段均为前半夜,下午为各量级降水过程发生最少的时段.
Based on the hourly precipitation data in main flood season （May-September） from 1994 to 2013 in Kashgar meteorological station, the diurnal variation characteristics of rainfall in recent 20 years were analyzed. The results showed that the rainfall was mainly concentrated at 20：00 to 6：00 next day of Beijing time, with the maximum rainfall appearing at 1：00, while the period from 7：00 to 19：00 was the low value section of the rainfall, with the minimum rainfall appearint at 16：00. The high value of rainfall frequency occurred at 00：00 to 7：00, with the minimum value appearing at 17：00. The largest rainfall intensity generally appeared at 16：00, and it took second place at 15：00, with the largest accumulated precipitation. The minimum rainfall intensity generally appeared at 15：00 corresponding to the low value of accumulated precipitation. The 1-3 h rainfall was more frequent and mainly occurred at evening and night. The maximum of rainfall frequency in 1 h was the precipitation less than or equal to 1.0 mm, however the precipitation more than or equal to 1.1 mm but less than or equal to 3.0 mm had main contribution to the total 1h precipitation. The light rain, moderate rain, and heavy rain most easily occurred at the first half of night（21：00-2：00）, and did not easily occurred in the afternoon.
出处
《沙漠与绿洲气象》
2016年第2期31-35,共5页
Desert and Oasis Meteorology
基金
新疆维吾尔自治区科技支撑项目(201533113)
关键词
降水
日变化
雨强
持续时间
喀什
rainfall
diurnal variation
rainfall intensity
rainfall duration
Kashgar
作者简介
赵克明（1983-），男，工程师，主要从事中短期天气预报与服务工作。E—mail：zkm226@sina.com
