摘要
利用山西省39个气象站1960—2010年的气象资料,结合地形特征,将山西省分为6个气候敏感区,采用潜在蒸散量和降水量的比值来计算干燥度指数,在此基础上使用IDW插值法生成山西省干燥度的分布图,并分析了近50 a山西省地表干燥度变化趋势。研究结果显示:(1)山西省多年平均干燥度指数为2.21,属于半干旱区;干燥度空间分布与气候、地形等因素密切相关,南北差异显著。整体上山西省中北部地区较为干旱,干燥度指数为2.36,东部南部则较为湿润,干燥度指数为1.93;由于降水和蒸散都呈下降趋势,因此,近50 a山西省干燥度指数虽有所上升,但变化幅度仅为0.04·10a-1,干旱化趋势并不显著;(2)近50 a来,除山西省北部地区干旱状况有所缓解外,其它地区干旱状况均呈增加趋势;(3)干燥度季节性差异显著,冬春干燥异常,夏秋则较为湿润。总体而言,气候变暖虽未加剧山西省的干燥程度,但暖干化趋势应引起足够的重视。
To investigate the variation tendency of surface aridity index from 1960-2010 in Shanxi province ,the region was divided into six climatic zones based on the climatic data of 39 meteorological stations and topography .A ratio of potential-evapotranspiration to precipitation was employed as the aridity index and its distribution was further created through the IDW method .The results show that the area of Shanxi belonged to a semi-arid area and the average aridity index was 2 .21 .The spatial distribution of mean annual aridity index was closely related to climate ,topography and other factors ,whereas differed significantly from north to south .Generally speaking ,northern and central regions of Shanxi province were relatively dry （the aridity index was 2 .36 ） ,and southern and eastern regions were humid （the aridity in-dex was 2 .36 ） .In recent 50 years ,the slight increase in the aridity index （as little as 0 .04·10a-1 ） was attributed to reductions of both precipitation and potential-evapotranspiration ,resulting in insignificant drought trend .It was further found that drought conditions had eased in the northern Shanxi ,while became more severe in other areas .Additionally , drought conditions in Shanxi province varied in different seasons ,humid in summer and fall and very dry in winter and spring .Therefore ,it was concluded that climatic warming had not aggravated surface aridity in Shanxi province in recent 50 years .However ,the climatic tendency of warming and drying should bring up enough attentions .
出处
《干旱地区农业研究》
CSCD
北大核心
2014年第6期244-249,共6页
Agricultural Research in the Arid Areas
基金
山西省气象局领军人才课题(SXKLJDQ20120906)
山西省气象局课题(SXKYBNY20138717)
关键词
干燥度指数
潜在蒸散量
降水量
IDW插值法
山西省
aridity index
potential-evapotranspiration
precipitation
IDW method
Shanxi province
