黔南州近40年降水时空变化特征分析

近年来黔南州年降水量和5—8月降水量表现为增加趋势且降水偏多年份越发明显,为研究其变化规律,故选取黔南州近40年降水资料对其时间和空间状态进行分析。得出黔南州降水大致可分为三种类型:a.降水一致性偏多(偏少)型;b.西北少东南多型;c.中部多南北少型。近年来尽管降水量有增加趋势,但从近40年时间尺度来看,黔南州降水表现为减少趋势,其值在平均值周围变动;降水集中时段5—8月的变化趋势平缓,仅个别年份偏离平均值较多。

Analysis on Characteristics of Temporal and Spatial Changes of Precipitation in southern GuiZhou province in the Past 40 Years

In recent years,the annual precipitation in QianNan State and the precipitation from May to August have shown an increasing trend,and years with more precipitation have become more obvious.In order to study the variation of precipitation,the precipitation data of the past 40 years in Qiannan is selected for its temporal and spatial status Perform analysis.It is concluded that the precipitation in the whole state can be roughly divided into three types:a.The consistency of precipitation is too much(less);b.Few in the northwest and excessive in the southeast;c.The central part is more(less)and the south and north is less(more).The increase trend of annual precipitation over time is obvious;while the change trend of precipitation-concentration period from May to August is gentle,and only a few years deviate from the average value.