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简介:Glacierinventorycompilationduringthepast20yearsandmodificationsofthatfortheEasternPamirandBanggongLakeindicatethatthereare46,342modernglacierswithatotalareaandvolumeof59415km2and5601km3respectivelyinChina.Theseglacierscanbeclassifiedintomaritimeandcontinental(includingsub-continentalandextremelycontinental)types.ResearchesshowthatglaciersinChinahavebeenretreatingsincetheLittleIceAgeandthemasswastagewasacceleratedduringthepast30to40years.BeinganimportantpartofglaciologicalstudiesinChina,icecoreclimaticandenvironmentalstudiesonTibetanPlateauandintheAntarcticahaveprovidedabundant,highresolutioninformationaboutpastclimaticandenvironmentalevolutionovertheTibetanPlateauandAntarctica.ExceptfordifferentparametersrecordedinicecoresrelatingtoclimateandenvironmentchangesonTibetanPlateau,recordsfromicecoresextractedfromdifferentglaciersshowthatthediscrepanciesinclimaticandenvironmentalchangesonthenorthandsouthpartsoftheplateaumaybetheconsequenceofdifferentinfluencingeffectsfromterrestrialandsolarsources.GlaciologicalandmeteorologicalphenomenaimplythatLambertGlaciervalleyisanimportantboundaryofclimateintheeastAntarctica,whichisthoughttobeconnectedwithcyclonicactivitiesandCircum-polarWavesovertheAntarctica.
简介:PermafrostinChinaincludeshighlatitudepermafrostinnortheasternChina,alpinepermafrostinnorthwesternChinaandhighplateaupermafrostontheTibetanPlateau.Thehighaltitudepermafrostisabout92%ofthetotalpermafrostareainChina.Thesouthboundaryorlowerlimitoftheseasonallyfrozengroundisdefinedinaccordancewiththe0℃isothermallineofmeanairtemperatureinJanuary,whichisroughlycorrespondingtothelineextendingfromtheQinlingMountainstotheHuaiheRiverintheeastandtothesoutheastboundaryoftheTibetanPlateauinthewest.SeasonalfrozengroundoccursinlargepartsoftheterritoryinnorthernChina,includingNortheast,North,NorthwestChinaandtheTibetanPlateauexceptforpermafrostregions,andaccountingforabout55%ofthelandareaofChina.Thesouthernlimitofshort-termfrozengroundgenerallyswingssouthandnorthalongthe25°northernlatitudeline,occurringinthewetandwarmsubtropicmonsoonclimaticzone.Itsareaislessthan20%ofthelandareaofChina.