三角帽方法评估GPP产品的不确定性

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中图分类号：Q948.1 文献标志码：A 文章编号：2095-2945（2025）28-0033-05

Abstract：Intheabsenceof groundtruth，thisstudyevaluatestheuncertaintyoffiveGPPproducts（VPM，Nirv，ANN， CLM4，andGTEC）across theconterminousUnitedStatesusingthegeneralizedThre-CorneredHat（TCH）methodfromdiferent perspectives.Theresultsshowthat：From2O0Oto2O10，GPPinthenortheasternandsoutheasterncoastalregionsofthe conterminousUnitedStatesdeclined，whileGPPintheMidwestshowedanincreasingtrend；UsingtheTCHmethod，the uncertaintyofGPPacrosstheconterminousUnited Stateswasfoundtoincreasefromwesttoeast;Theuncertaintydistributionof diferentproductsintermsoflatitude，longitude，andpixelratioisloselyrelatedtothemodeltypesandparameterhandling methods;GPPuncertaintyishigestinborealclimates，hileinaridandtropicalclimates，uncertaintyissignificantlynflueced bythemodelstreatmentofwaterstressandlightintensity.TheresultsemphasizetheneedforGPPmodelstocomprehensively considermultiplefactorsunderdiferentgeographicalandclimaticconditionstoselectappropriateconstructionmethods.The generalizedThree-CorneredHatmethodprovidesanefectivemeansforassessingtheuncertaintyofGPPproductsandother carbon flux products in the absence of ground truth.

Keywords： generalized TCH; GPP；uncertainty； spatial analysis; conterminous United State

植被生产力的变化对全球碳循环和气候变化具有重要影响，可以分为总初级生产力（GPP）和净初级生产力（NPP），这2个参数是全球变化及碳循环研究的一个重要内容。（剩余7022字）