关键词：
降水日变化;夜间降水量;水稻抽穗扬花期;降水分布;长株潭地区
摘 要：
以湖南省长株潭城市群体为研究对象,基于研究区域11个气象站1961-2017年3-11月逐小时降水量,分析了该区域内降水日变化、夜间降水量的年代际变化、季节演变(春、夏、秋季)与早稻抽穗扬花时段降水分布特征.结果表明,长株潭地区降水日变化呈现双峰型分布,小时降水量和降水频次峰值时次基本一致.各个年代、季节小时降水量峰值均稳定位于4:00~8:00和15:00~16:00,但峰值和次峰值的时次存在差异;随年代推移,夜间降水量呈现波动上升趋势,20世纪90年代和21世纪00年代夜间降水量高于日间;春、夏、秋季夜间降水量与日间比值分别为117%、81%、110%;幕阜-连云山丘区为研究区域夜间降水量高值区;幕阜-罗霄山脉区为研究地区内早稻抽穗扬花时段降水量、降水强度的高值区,株洲中部为同时段降水偏少的地区.
作 者：
LI Jing;WANG Tian-ying;ZHU Hong-wu;LU Kui-dong;Key Lab of Hunan Province for Meteorological Disaster Prevention and Mitigation;Hunan Meteorological Research Institute of Hunan Province;Hunan Meteorological Information Center;
单 位：
LI Jing%WANG Tian-ying%ZHU Hong-wu%LU Kui-dong%Key Lab of Hunan Province for Meteorological Disaster Prevention and Mitigation%Hunan Meteorological Research Institute of Hunan Province%Hunan Meteorological Information Center
关键词：
diurnal variation of precipitation;;nocturnal precipitation;;heading-blooming period of rice;;distribution of precipitation;;Chang-Zhu-Tan area
摘 要：
Taking Chang-Zhu-Tan typical city-group as the research object, based on the hourly precipitation data(1961 to2017, Mar. to Nov.) from 11 meteorological stations in the study area, the features of interdecadal and seasonal(spring,summer, autumn) variations of the diurnal variation of precipitation, nocturnal precipitation, and precipitation distribution during early rice's blooming period were analyzed. The results showed that, the diurnal distribution of hourly precipitation and precipitation frequency in Chang-Zhu-Tan area were both bimodal, and the peaks appeared basically in the same time.The peaks of precipitation in each decade and season were at 4:00～8:00 and 15:00～16:00 stably, but the peak and subpeak time appeared differently within decades and seasons. With the progress of time, nocturnal precipitation wavelike rose,and became higher than diurnal precipitation in 1990 s and 2000 s. The ratio of nocturnal and diurnal precipitation in spring,summer and autumn were 117%, 81% and 110%, respectively. Mufu-Lianyun Mountain district was the high center of nocturnal precipitation. During early rice's blooming period, Mufu-Luoxiao Mountain district was the high center of rainfall amount and precipitation frequency, while central Zhuzhou was the low center.
