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《A reassessment of lake and wetland feedbacks on the North African英文版》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、GEOPHYSICALRESEARCHLETTERS,VOL.39,L07701,doi:10.1029/2012GL050992,2012AreassessmentoflakeandwetlandfeedbacksontheNorthAfricanHoloceneclimate122222G.Krinner,A.-M.Lézine,P.Braconnot,P.Sepulchre,G.Ramstein,C.Grenier,1,3andI.GouttevinReceived24January2012
2、;revised2March2012;accepted2March2012;published3April2012.[1]LargepartsoftheSaharawerevegetatedduringtheearlystrongeriftheprescribedbackgroundbaresoilalbedoinatomidHolocene.Severalpositivefeedbacks,mostnotablyclimatemodelislower.Thisisclearlyinlinewit
3、htheanalysisrelatedtovegetation,havebeenshowntohavefavoredthebyCharney[1975]whosuggestedthatanincreasedsurfacenorthwardmigrationofthedesertboundary.Duringthisalbedosuppressesatmosphericascendanceand,thus,leadstoperiod,numerouslakesandwetlandsexistedin
4、theSaharareducedprecipitationrates.Thiseffectisillustratedinmoreregionandmighthaveactedasalocalmoisturesource.recentworkbyKnorrandSchnitzler[2006]andVamborgetal.However,earliermodelstudiesoftheeffectsofopenwater[2011]whoshowthattheorbitallytriggeredmi
5、d-Holocenesurfacesonthemid-HoloceneNorthAfricanclimateSahelprecipitationincreasecanbeamplifiedinaclimatemodelsuggestedthatthesewereweakanddidnotcontributeifasoilalbedoschemeisusedthattakesintoaccountsimulatedsignificantlytothisnorthwardmigrationoftheN
6、orthorprescribedvegetationcoverandlitter.Africanclimatezones.Usingastate-of-the-artclimate[4]Concerningopenwatersurfaces,CoeandBonan[1997]model,wesuggestthattheeffectofopen-watersurfacesonshowedthatopenwatersurfacesprovideafurtherpositivethemid-Holoce
7、neNorthAfricanclimatemighthavebeenfeedbackamplifyingtheHoloceneorbitalforcing.Prescribingmuchstrongerthanpreviouslyestimated,regionallymoreopenwatersurfacesinlinewithreconstructedmid-Holocenethandoublingthesimulatedprecipitationrates.Itisthussurfacewa
8、terextentinaclimatemodelledtoasignificantpossiblethatthiseffect,combinedtootherknownpositivestrengtheningofthesimulatedmonsooncirculationandfeedbacks,favoredtheappearanceofthe“GreenSahara”.increasedprecipitationsouthof20N,butnotfurthernorth.C
