第四届树轮大会邵雪梅报告.ppt

TemperatureVariationsinthePast2000YearsintheNortheasternTibetanPlateauDerivedfromTreeRingData,XuemeiShao1,2,MingqiLi1,Zhi-YongYin3,1,YongZhangetal.1.KeyLaboratoryofLandSurfacePatternandSimulation,InstituteofGeographicSciencesandNaturalResourcesResearch,CAS,Beijing100101,China;2.CenterforExcellenceandInnovationinTibetanPlateauEarthSystemSciences,CAS,Beijing100101,China3.DepartmentofEnvironmentalandOceanSciences,UniversityofSanDiego,SanDiego,92110,UnitedStatesofAmerica2015-11-08,国际PAGES-IGBP研究计划2K项目,2K项目第一阶段的结果,目的：为气候模式验证提供资料中世纪是否温暖，小冰期是否是全球性的，引起气候变化的原因,MainachievementofthePAGES2knetworkphase1,2knetwork.(2013)NatureGeoscience,multi-proxy,pairwisecomparisonmulti-proxy,compositeplusscaletrees,point-by-pointregressiontrees&pollen,principalcomponentsmulti-proxy,ensemblemulti-proxy,principalcomponentsglacierice,compositeplusscale,2knetwork.(2013)NatureGeoscience,降水重建,建立水分敏感的长年表（年）青藏高原东北部是理想的场所,Inthisreport:Onechronologywasupdatedtocoverthewholepast2000years,Andanewchronologywasdevelopedfromtheuppertreelimitalsocoveringthewholepast2000yearsBothofthemarewellreplicated.,温度重建尝试,ClimatecharacteristicsatDelinghastation,Meanannualprecipitationisonly177.4mmMeantemperatureis10.9CinJanuaryand16.5CinJuly(1971-2000),Aridandsemi-aridarea,UppertreelineatDLH,UppertreelineatWL,Standingdeadtrees,Livingtrees,SamplinginformationattheuppertreelineinDelingha,SamplinginformationattheuppertreelineinWulan,PartialsampledepthfromtheuppertreelineinDLH,Tworing-widthchronologies,Fortheoriginalseries:0.69for2258years(246BC-AD2012)0.75sinceAD10.787sinceAD5000.791sinceAD1000Forthefirstdifferencedtwoseries:0.84for2257years0.85sinceAD10.86sinceAD5000.87sinceAD1000,Correlationcoefficientsofthetwoseries,Correlationoftreeradialgrowthtoclimate,Correlationoftreeradialgrowthtoclimate,fororiginaldata:Corr.Coe.is0.51for1957-2012Corr.Coe.iso.60for1970-2012fordifferenceddata:Corr.Coe.is0.50for1957-2012Corr.Coe.iso.64for1970-2012,Correlationsbetweenring-widthindexandJuly-Aug.meantemperaturedata,July-Aug.meantenmperaturesince1970isselectedasthedependentvariableinthecalibration,Calibration,MeantemperatureinJuly-Aug.wasreconstructed,Verification,Reconstructedtemperaturevariationsforthepast2012years,ComparisonwithothertemperatureseriesinChina,ComparisonwithothertemperatureseriesinNH,Spatialcorrelationsinstrumentaldataandreconstructedseries,Spatialcorrelationfirst-differencedseries,Waveletpowerspectrum,Conclusions,Treesgrowingattheuppertreelineinthesemi-aridregionofthenortheasternTibetanPlateauaresensitivetoJulyandAug.temperaturevariation.AreconstructionofJuly-Augusttemperat