摘要
利用辽宁省52个观测站1966—2010年降水数据,采用空间分析和时间序列分析相结合的方法,对辽宁省年降水和四季降水以及不同年代的降水界限变化进行了时空演变特征分析,结果表明:近45年辽宁省降水呈弱的下降趋势,但总趋势不显著。不同降水界限范围具有明显的年际变化特征。经分析得出,20世纪60年代后期以来,辽宁省半干旱区在增加,半湿润区在缩小,而湿润区范围基本无变化。从时间分布上看,春季与冬季变化趋势相似,都呈增加趋势,但冬季的增加趋势很弱;夏季和秋季的变化趋势相似,都呈减少趋势。从空间分布上看,四季降水均呈现自西向东增多的趋势,四季降水的大值区都出现在辽宁省东部,夏、冬季东部与西部降水的差别较大。
By using the precipitation data of 52 stations in Liaoning Province during 1966 to 2010,using spatial and temporal series analysis,temporal and spatial evolution feature of annual precipitation,seasonal precipitation and annual variety of different precipitation boundaries in Liaoning Province were analyzed.The results showed that in recent 45 years,the annual precipitation had a weakly decreasing trend,but the overall trend was not significant.The annual variety features of different precipitation boundaries were obvious.Through analysis,since later period of 1960s,the semi arid area of Liaoning increased,the semi humid area decreased,and the wetness area basically had no change.From the view of temporal distributions,the trends were similar in spring and winter,which were enhancive trends,but the trend in winter was very weakly.Meanwhile,the trends were similar in summer and autumn,which both showed decreasing trends.From the view of spatial distributions,seasonal precipitation showed an increasing trend from west to east,high value area of seasonal precipitation were found in the eastern part of Liaoning Province,the eastern and western precipitations in summer and winter were different.
出处
《现代农业科技》
2015年第3期243-245,248,共4页
Modern Agricultural Science and Technology
基金
辽宁省气象局项目"道路天气预警服务
对策与气象服务效益评估"(GYHY201106001)
关键词
降水量
时空演变特征
季节变化
辽宁省
1966-2010年
precipitation
spatial and temporal evolution feature
seasonal variety
Liaoning Province
1966-2010
