22718.中全新世以來普若崗日北部地區(qū)湖泊和冰川變化研究

1、中國科學院研究生院碩士學位論文中全新世以來普若崗日北部地區(qū)湖泊和冰川變化研究姓名：陳麗佳申請學位級別：碩士專業(yè)：自然地理學指導教師：易朝路201205ABSTRACTLAKELEVELFLUCTUATl0NANDGLACIERAD、／CANCESINNOI汀HPURUOGANGRISINCETHEMID—HOLOCENEABSTRACTLocatedinthehinterlandoftheQinghai—TibetPlateau，atr

2、ansitionregionoftheAsianmonsoonandthewesterlyDuogecuorenisalakesuppliedbythelargesticefieldinlowerlatitude，PuruogangfiDuetoharshclimaticconditionsandinconvenienttraffic，fewresearchshadbeendevelopedthereThefirsthanddataof

3、thisregioncontainsvitalinformationaboutevolutionoflakesandglaciersandclimatechangemodesinthehinterlandoftheplateauBylandscapeinterpretationandDGPSsurveyingatDuogecuoren，wefoundthreelaketerracesof68m、12mand185monthesouthe

4、astbank，andtwoterracesonthesouthbankof7～llmand16～18mByGISandAMS14CdatingresultswedrewthreelakesatdifferenttimesinHolocene；bysurveyingandAMS10BedatingmethodswegottherangeandtimefortheNeoglaciationonnorthPuruogangriBasedon

5、thecharacteristicsoflakeandglacierevolutions，wediscussedtheirclimaticimplicationsMainconclusionsareasfollows：1FluctuationsofDuogecuorenlakelevelintheHoloceneweremoderate，withareasof48218km2at59calkaBPand44414km2at55calka

6、BP，9778km2and5974km2largerthanmodernlakearea，respectively2At59calkaBP、55calkaBP，DuogecuorenlakelevelreachedhighbutlastshortlyprobablyduetoenhancedmonsoonandincreasedprecipitationandmeltwaterDuring5432calkaBP，lakelevelkep

7、tlowandsaltnesswashigh，mainlydueteductionofmeltingwaterandprecipitation3Glacier5251380018onnorthPuruogangriwasrelativelystableduringtheNeoGlaciationandtheLittleIceAge4Sincemidholocene，Glacier5251380018onnorthPuruogangria