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余俊清 著; 科学出版社 编 / 科学出版社 / 2008-01 / 精装
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青海湖古气候与古环境(英文版)
《青海湖古气候与古环境(英文版)》以青藏高原东北部六万.0以来的气候与环境演变为主要研究内容,以多学科方法研究获得了青海湖岩芯多项环境指标,并以此为依据,分析和论证了青海湖MIS3、MIS2、末次冰期向全新世过渡时期,以及全新世等各时段的水位与气候变化,及其与东亚季风演变的关联。
1Introduction1.1Aimandscope1.2Previousinvestigations1.2.11961-1962expeditionstoLakeQinghai1.2.2Sino-Swissexpeditionin19851.2.31987drill-coreproject1.2.4Post-1990investigations1.3PaleoclimatestudyofChina:abriefreview1.3.1EastAsianmonsoon——themodemclimatesystem1.3.2EastAsianpaleomonsoon2Geographic,GeologicalandLimnologicalSettingofLakeQinghai2.1Geologicalsetting2.2Geomorphologicalsetting2.3Geographicsetting2.3.1Climate2.3.2Vegetation2.3.3Riversinthecatchment2.4Limnologicalsetting2.4.1Waterchemistry2.4.2Physicalcharacteristics2.4.3Biologicalcharacteristics2.5Peripherallakes2.5.1LakeErhai2.5.2LakeGahai2.5.3HaiyanBay2.5.4Sand-IslandLake3InvestigationMethods3.1Introduction3.2Fieldinvestigation3.2.1Seismicprofiling3.2.2Coring3.3Laboratoryinvestigation3.3.1Radiometricdating3.3.2Magneticsusceptibility:corelogging3.3.3Totalorganiccarbonandtotalnitrogen,andC/Nratio3.3.4Macrofossilindicator3.3.6X-raydiffractionandscanningelectronmicroscopy(SEM)3.3.7Oxygenandcarbonstableisotopes3.4Notesoninvestigationmethods4SeismicInvestigation,LithologieStudyofSedimentCoresandRadiometrieDating4.1Introduction4.2Sub-bottomprofilesfromthe3.5kHzseismicinvestigations4.3Radiometricdating4.3.1Radiocarbondatingandsedimentationrates4.3.2pbdatingandsedimentaccumulationrates4.4Lithologicunits4.4.1LithologicunitsofcoreQ14B4.4.2LithologicunitsofcoreQ16C4.4.3Corecorrelationandboundarydescription5LakeLevelsandClimateChangeDuringtheHoloeene5.1Introduction5.2Resultsandinterpretations5.2.114Cdatedlithostratigraphy5.2.2TOC,TNandC/Nratio5.2.3TCCandcarbonatemineralrecord5.2.4Fossilseedsfromrootedaquaticplant5.2.5Ostracodeshellstable-isotopicrecord5.2.6Pollenrecord5.2.7Magneticsusceptibility5.3Holocenelakelevelsandclimatereconstruction5.4Acorrelationwithproxyrecordsfromotherstudies5.5HoloceneclimatevariabilityofEastAsia5.5.1EarlyHoloceneclimateregime5.5.2Mid-HoloceneclimateandHoloceneOptimum5.5.3LateHoloceneclimate5.5.4ClimateforcingandfeedbacksduringtheHolocene5.6Summaryandconclusions6AbruptChangesinClimaticConditionsAcrosstheLateglacial/HoloeeneTransitionontheNEQinghai-TibetPlateau6.1Introduction6.2Resultsfromamulti-proxyinvestigationoncoresQ14BandQ16C6.2.1Distinctlithostratigraphicunits6.2.2Paleobotanicevidence6.2.3Corelogsofmagneticsusceptibility6.2.4Carbonatecontentandmineralogicalrecord6.2.5Oxygenstable-isotopicrecord6.2.6Totalnitrogencontent6.3Reconstructionoflakelevelsandlimnologicalconditions6.4Abruptshiftsinhydro-climaticconditions6.5CorrelationwithotherpaleoenvironmentalrecordsinChina6.6Conclusions7PaleoenvironmentalSignaturesfromCarbonateMineralsandStableIsotopicRatiosfromLakeQinghai7.1Introduction7.2Moderncarbonateenvironments7.3Carbonatemineralsinthesedimentcores7.4LakeQinghaidolomiteandinferredpaleoenvironment7.4.1Lithology,mineralogy,organiccarbonandnitrogen,andisotopiccomposition7.4.2Geochemicalandpaleoenvironmentalconditionsforthedolomiteformation7.5Brineevolutiondeducedfromthecarbonatemineralrecord7.5.1Mg/Caratio7.5.2Carbonateproductionandsalinity7.6Stableisotopicratiosandtheircovariance7.6.1Isotopiccovariance7.6.2IsotoperesultsfromLakeQinghai7.6.3Discussion7.7Summaryandconclusions8PaleoenvironmentandPaleoclimateConditionsDuringtheMarineIsotopicStage3andtheLastGlacialMaximum8.1Introduction8.2Resultsandinterpretations8.2.1SeismicreflectionProfileNo.18.2.2SedimentcoreQ878.2.3AMS14CdatingandanalyticalmeasurementsofQ878.2.4Carbonatemineralrecord8.2.5Totalorganiccarbon,totalnitrogenandC/Nratio8.3ClimaticconditionsattheMIS3andtheLGM8.4Correlationwithotherproxyrecordsintheregion8.4.1TheMarineIsotopeStage3(MIS3)8.4.2TheLastGlacialMaximum(LGM)8.4.3Correlationwithglaciationrecords8.5SummaryandconclusionsReferencesAcknowledgments
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