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1、ARTICLEINPRESSQuaternaryScienceReviews23(2004)811–831Palaeoclimateinterpretationofstableisotopedatafromlakesedimentarchivesa,bMelanieJ.Leng*,JimD.MarshallaNERCIsotopeGeosciencesLaboratory,BritishGeologicalSurvey,NottinghamNG125GG,UKbDepartmentofEarthSciences,Universit
2、yofLiverpool,4BrownlowStreet,LiverpoolL693GP,UKReceived2April2003;accepted13June2003AbstractTheisotopecompositionofauthigenicandbiogeniccarbonatesanddiatomsilicaarecommonlyusedaspalaeoclimateproxiesfromlakesediments.Thisarticlereviewsthecontrolsontheisotopecomposition
3、oflacustrineskeletalandnon-skeletaldepositsandillustrateshowstableisotopestudiescontributetoanunderstandingofchangesintemperature,precipitationpatterns,evaporationandthecarboncycle.Ithighlightsthedifferencesinthepalaeoclimatepotentialofawiderangeoflakesrangingfromopen
4、toclosedlakebasins.Alargenumberofthecasehistories,butnotall,aredrawnfromstudiesoftemperatelakesfromEurope.Largeclosedlakesystems,inthetropicsandelsewhere,losewaterpredominantlythroughevaporation,andcontainsediments18withvariableandgenerallyhighdOvalues.Fluctuationsint
5、heisotopecompositionofauthigenicorbiogenicmineralsaremainlyafunctionoflong-termchangesintheprecipitation/evaporationratio.Incontrastsmallopenlakeswhichhaveadegreeofthrough-18flowtypicallycontainsedimentswithdOvaluesthatvarybynomorethanafew%.Thesevariationsaregenerallya
6、scribedtovariationsintemperatureortheisotopecompositionofprecipitation(dp),fromwhicheitheranannualorseasonallyspecificsignalcanbegained.ThesetypesoflakesarecommoninNorthernEuropeandathighaltitudes.Theinterpretationofisotopedatafromalacustrinesuccessionrequiresaknowledg
7、eofthelocalprocessesthatmightcontrolandmodifythesignal.Theireffectsneedtobequantified,andarobustcalibrationusingthemodernlakesystemisnecessarytoestablishtherelationshipbetweenthemeasuredsignal,theisotopiccompositionofthehostwaters,andclimate.r2004ElsevierLtd.Allrightsr
8、eserved.1.IntroductionAperennialprobleminthequantitativeinterpretationofgeochemicalproxiesforclimateisthatthesystemsareStabl
