简介：InthisstudytherelationshipbetweentheArcticOscillation(AO)andclimateinChinainborealwinterareinvestigated.Correlationanalysisforthelast41yearsshowsthatthewintertemperatureandprecipitationinChinachangeinphasewithAO.Highpostiviecorrelation(>0.04)betweentemperatureandAOappearsinthenorthernChina.HighcorrelationcoefficientsbetweenprecipitationandAOcoverthesouthernChina(closetotheSouthChyinaSea)andthecentralChina(between30°-40°Nandeastof-100°E),withthevaluesvaryingbetween+0.3and+0.4.ItisfoundthatduringthepastseveraldecadestheprecipitationwasstronglyaffectedbyAO,butforthetemperaturetheSiberianHighplaysamoreimportantrole.AttheinterdecadaltimescaletheAOhassignificantinfluenceonbothtemperatureandpreciptiation.MultivariateregressionanalysisdemonstratesthatAOandtheSiberianHighrelatedvarianceintemperatureandprecipitationis35%and11%respectively,Forprecipitation,howevertheportionisratherlow,implyingthatsomeotherfactorsmayberesponsibleforthechangesinprecipitation,inadditiontoAOandtheSiberianHigh.

简介：在西南中国的云南的低纬度高地的降水政体服从于在东方亚洲夏天季风和印度夏天之间的相互作用表面山志学的季风，和影响。在它的空间、时间的模式的变化的理解着急地为气候变化设计，水文学影响建模，和地区性、下游的水资源管理被需要。用在最后几十年(1950s2007)的低纬度高地的每日的降水记录，降水的一个时间系列索引，包括年度降水，多雨的天的数字，吝啬的年度降水紧张，雨季的发作的日期，降水的度和时期季节的集中，最高1天、3天、7天的降水，和降水在不同紧张上面为降水多雨的天总计并且数(例如10公里，25公里一没有趋势的预先增白的Mann-Kendall趋势测试然后被用来检测时间系列数据的趋势。结果证明在年度降水和越过低纬度高地的降水趋势的强壮的季节的区别没有重要趋势。弹簧和冬季正在变得更湿，夏天正在变得更干燥。秋天在东方正在变得更干燥并且在西方更湿。作为后果，降水的seasonality稍微正在变弱。雨季和最高的降水的时期的开始趋于更早。同时，低纬度高地也见证不太多雨的天，更强烈的降水，稍微更长中等、重的降水事件，和更经常的极端降水事件。另外，降水趋势的地区性的区别是显著的。这些变化可以与东方亚洲夏天季风变弱并且南方亚洲人夏天季风，以及特殊多山的地面的走廊障碍效果加强被联系。然而，包含的物理机制仍然需要以后被揭开。

简介：Itisaverycomplicatedproblemtoestimateevapotranspiration(ET)overalargeareaoflandsurface.Inthispaper,theevapotranspirationestimationmodelsfordensevegetationandbaresoilarepresented,basedontheinformationofparameterslikevegetationcover-degreeandsurfacealbedo.Combinedwithvegetationcover-degreedata,amodelforregionalevapotranspirationestimationovertheheterogeneouslandscapeisderived.ThroughacasestudyusingremotesensingdataoverNorthwestChina,theaccuracyofthemodelforregionalevapotranspirationestimationischecked.Theresultshowsthattheaccuracyofthemodelissatisfactory.ThefeaturesofevapotranspirationoverNorthwestChinaarealsodiscussedwiththeapplicationofthemodel.

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简介：Basedonthedataupto1999fromhydroclimatologicaldepartments,thispaperanalyzestheclimaticdivideimplicationsoftheQinlingMountainsinregionalresponsetotheprocessofclimatewarming,duetowhichthegradesofdryness/wetness(GDW)in100yearsshowthatthenorthernregionhasenteredadroughtperiod,whilethesouthernisahumidperiod.Inacourseoftenyears,theD-valueofannualaverageairtemperatureoversouthernShaanxi(theHanjiangValley)andtheCentralShaanxiPlain(theGuanzhongPlain)hasnarrowed,i.e.,theformerwithaslightchangeandthelatterwithrapidincreaseintemperature.BothregionswerearidwiththedecreaseinprecipitationD-value,namelytheplainbecamewarmerwhilethesouthwasdrier.TheQinlingMountainsplayapronouncedroleintheclimaticdivide.Therunoffcoefficient(RC)oftheWeiheRiverdecreasessynchronouslywiththatoftheHanjiangduetoclimatewarming.TheRCofWeihedroppedfrom0.2inthe1950stolessthan0.1inthe1990s.TheWeiheValley(theGuanzhongPlain)ispracticallyanaridareaduetoshortageofwater.Thesuccessive0.5,1.0℃temperatureanomalyoverChinamarks,perhaps,theimportanttransitionperiodinwhichtheenvironmentbecomesmorevulnerablethanbefore.Thestudyshowstheobvioustrendofenvironmentalaridity,whichisofhelptotheunderstandingofregionalresponsetoglobalclimatechange.

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简介：WaterdischargedataoftheYellowRiveroverthepast60yearswasanalyzedusingthecontinuouswavelettransform(CWT)andMann-Kendall(MK)testmethodstoidentifyspatialandtemporalvariationpatterns.PotentialconnectionsbetweenwaterdischargeintheYellowRiverBasinandElNio/SouthernOscillation(ENSO)werealsoexaminedbythecrosswaveletandwaveletcoherencemethods.CWTresultsshowthattheperiodicoscillationsinwaterdischargeshadoccurredatthetemporalscalesof1-,2to4-,6to8and10to22-year.Itwasalsofoundthatattheannualtimescale(1-year)thephaserelationsbetweenwaterdischargeandENSOwereindistinctprobablyduetothestronginfluencebyhumandisturbances.However,overthelongertimescales,thephaserelationbecomesmuchclearerwithananti-phaserelationbeingfoundmainlyatinter-annualscale(2to8-year)andin-phaserelationatdecadalscale(16to22-year).AccordingtotheMKtestresultswaterdischargeatmoststationsexceptTangnaihaihavedecreasedsignificantlyandtheabruptchangeoccurredinthemid-1980sortheearly1990s.Thechangesinwaterdischargewerefoundtobeinfluencedbybothclimatechangesandhumanactivities.Before1970thechangeinwaterdischargewaspositivelyrelatedtoprecipitationvariationsintheriverbasin,butafter1970thedecreaseinwaterdischargehasbeenlargelycausedbyvarioushumanactivitiesincludingconstructionsofreservoirs,waterabstractionandwater-soilconservationwithwaterabstractionbeingthemaincause.

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简介：夏天从1961～2004的Qinghai西藏高原上的97个气象学的车站的逐日的降水数据被选择通过积累的变化分析时间空间的分发，关联分析，回归分析，empir

简介：在19612009期间在Hengduan山区域基于20个车站的气象学的数据，潜在的土壤水分蒸发蒸腾损失总量的年度、季节的变化与Penman-Monteith模型一起在联合被分析。与在ArcGIS下面的花键插值的方法，潜在的土壤水分蒸发蒸腾损失总量的空间分发被介绍研究地区性的差别，并且关联分析被用来讨论影响潜在的土壤水分蒸发蒸腾损失总量的主导的因素。结果显示自从1960年代，年度潜在的土壤水分蒸发蒸腾损失总量显示出一个减少的趋势，特别从1980年代到1990年代，当自从2000，它显示出一个增加的趋势时。地区性的潜在的土壤水分蒸发蒸腾损失总量显示出0.17公里a1的率。在Hengduan山的北方，中间和南方的潜在的土壤水分蒸发蒸腾损失总量在学习时期上展出了减少的趋势，并且它的地区性的趋势在从西南的衰落上到东北。

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