福建省年最大一日降水发生时间的空间差异

Spatial Variation of the Time of Maximum Daily Precipitation in Fujian Province

利用福建省25个气象站点1960—2013年的逐日降水数据,以月为单位统计各站点年最大一日降水出现时间的年内分布,分析福建省年最大一日降水发生时间的年内变化及其空间差异。结果表明:(1)福建省年最大一日降水发生时间的年内分布表现为单峰型和双峰型2种;(2)年最大一日降水发生时间的年内分布具有较大的空间差异,西北部地区以前汛期为主,东南部地区以后汛期为主;(3)总体上看,年最大一日降水出现在前汛期的频数下降,反之后汛期的频数有所上升,这是值得进一步研究的防汛新情势。

Based on1960-2013years daily precipitation data of25meteorological stations in Fujian Province,the annual maximum daily precipitation occurrence time at each site was counted monthly,and their annual and spatial variations of maximum daily precipitation time in the province were analyzed.The results showed that:(1)The monthly distribution of the time showed there were two types of single peak and double peak;(2)It had obvious spatial difference for the monthly distribution of the annual maximum daily precipitation and most of them occurred in pre-flood period in the northwest region,but was in later-flood period in the southeast region;(3)The time series of the frequency of the annual maximum daily precipitation in pre-flood period showed a reducing trend,whereas an increasing trend in later-flood period,which is a new situation for the flood prevention worthy to be further studied.