1986—2016年辽宁省强降水气候特征

Climate Characteristics of Strong Precipitation in Liaoning Province from 1986 to 2016

利用1986—2016年62个国家气象站5—10月的逐日和逐小时降水观测资料,分析了辽宁省强降水的发生规律,包括强降水发生范围,逐年、逐月、逐旬、逐时变化特征、空间分布特征、雨强分布规律等。结果表明:(1)1994年辽宁省强降水频繁、雨强大、降水范围大,为典型强降水年份。(2)辽宁省强降水主要集中在7—8月,尤其是7月下旬—8月上旬,占总发生次数的38.3%。(3)早晨和下午为短时强降水高发时段,上午及夜间为短时强降水的低发时段。(4)辽宁省强降水呈东多西少、南多北少特点,存在3个高值区,2个低值区。(5)辽宁省短时强降水以20~40mm/h为主,日强降水以50~100mm/24h为主。

Based on the daily and hourly observational precipitation data of 62 meteorological stations from May to October during 1986-2016,the occurrence regularity characteristics of the strong precipitation in Liaoning Province were investigated.Particularly,we analyzed the spatial and temporal distribution of the strong precipitation and the time evolution features at multi-time scales.Six main conclusions were presented.(1)1994 is a typical rainy year with a frequently-occurred,intense and large-scale strong precipitation.(2)The strong precipitation mainly occurs in July and August,and the rainfall in late July and early August accounts for 38.3%.(3)It is found that the strong precipitation is more likely to occur in the morning and afternoon rather than in the forenoon or nighttime.(4)Strong precipitation in the east and south of Liaoning Province are more than that in the west and north,and it is with three high centers and two low centers.(5)In Liaoning Province,short-term heavy precipitation mainly occurs at a magnitude of 20~40 mm/h,and daily heavy precipitation mainly occurs at a magnitude of 50~100 mm/h.