气候变暖背景下宁夏暴雨日数的变化

(整期优先)网络出版时间:2008-07-18
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ByusingthesummertorrentialraindaysdatainNingxia,theYinchuansoundingdataandtheNCEP/NCARreaualyzeddata,theevolutionalcharacteristicsandthecauseoftorrentialraindaysinNingxiawereanalyzedunderthebackgroundofclimatewarming.Theresultsshowthatbothannualtorrentialraindaysandannualmeantemperaturedisplayedconsistentincreasingtrends.FurtheranalysisresultsindicatethatatmosphericpotentialinstabilityhasgrowninthedaytimeinbothJulyandAugustandinthenighttimeinJuly,butweakenedinthenighttimeinAugustaftertheclimatewarmingofNingxia.Therefore,theclimatewarmingnotonlycausedmoredistinctivediurnalvariationoftheverticaldistributionofatmospherictemperaturesinYinchuan,butalsoresultedintheincreaseoftorrentialraindaysandinmoreobviousdiurnalvariationofthetorrentialraininNingxia.