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甘肃省近42年降水量变化时空分布格局分析.docx

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甘肃省近42年降水量变化时空分布格局分析 Abstract: Thispaperanalysesthespatialandtemporaldistributionpatternofprecipitationchangeinthepast42yearsinGansuProvincebyusingmeteorologicaldataandGIStechnology.TheresultsshowthattheprecipitationchangeinGansuProvinceischaracterizedbyobviousspatialdifferences,periodicchangesandsignificantseasonalcharacteristics.Precipitationhasbeendecreasinginsouth-centralGansuandincreasinginthenortheastandnorthwest,withthemostsignificantdecreaseinthenorth-centralregion.Besides,precipitationchangesintherainyseasonandthenon-rainyseasondiffergreatly,withmoresignificantchangesinthenon-rainyseason. Keywords:Precipitation,spatialdistribution,temporalvariation,GansuProvince,GIS Introduction: Climatechangehasreceivedunprecedentedattentioninrecentyears,andthechangesinprecipitationareanessentialaspectofit.Precipitationisacrucialfactorthataffectsagriculturalproduction,waterresourcesandecologicalenvironment.GansuProvinceislocatedinthearidandsemi-aridregionsofNorthwestChina.Itsprecipitationishighlyseasonalandunevenlydistributed.Changesinprecipitationwillhaveasignificantimpactontheeconomicandsocialdevelopmentoftheregion.Therefore,thespatialandtemporaldistributionpatternsofprecipitationchangesinGansuProvinceneedtobestudiedtoprovideascientificbasisforregionaldevelopmentplanninganddisasterpreventionandmitigation. Datasourcesandmethods: Themonthlyprecipitationdatafrom135stationsinGansuProvincefrom1978to2019werecollectedfromtheChinaMeteorologicalDataServiceCenterandpreprocessedinExcelsoftware.Theprecipitationdatawereinterpolatedusingtheinversedistanceweighting(IDW)method,andArcGIS10.7softwarewasusedtodrawtheprecipitationdistributionmap. Results: ThespatialdistributionofprecipitationinGansuProvincein1978-2019isshowninFigure1.ItcanbeseenthattheprecipitationishigherinthesoutheastandnorthwestpartofGansuProvinceandlowerinthenorth-centralpart. Figure1.SpatialdistributionofprecipitationinGansuProvincefrom1978to2019. Thelong-termtrendofprecipitationchangeinGansuProvinceisshowninFigure2.It