dynamic sea level changes following changes in the thermohaline circulation.pdf

《dynamic sea level changes following changes in the thermohaline circulation.pdf》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、ClimateDynamics(2005)24:347–354DOI10.1007/s00382-004-0505-yAndersLevermannÆAlexaGrieselMatthiasHofmannÆMarisaMontoyaStefanRahmstorfDynamicsealevelchangesfollowingchangesinthethermohalinecirculationReceived:9July2004/Accepted:15November2004/Publishedonline

2、:23February2005ÓSpringer-Verlag2005AbstractUsingthecoupledclimatemodelCLIMBER-isoftenoverlooked(VellingaandWood,2002;Schwartz3a,weinvestigatechangesinseasurfaceelevationduetoandRandall,2003).aweakeningofthethermohalinecirculation(THC).InPaleoclimaticdatai

3、ndicatethatstrongvariationsofadditiontoaglobalsealevelriseduetoawarmingofthetheTHChaveoccurredinthepast(seereferencesindeepsea,thisleadstoaregionaldynamicsealevel(Clarketal.,2002;Rahmstorf,2002)).Modelsimula-changewhichfollowsquasi-instantaneouslyanychang

4、etionssuggestthatglobalwarmingaccompaniedbyanintheoceancirculation.WeshowthatthemagnitudeofincreasedfreshwaterinputintotheNorthAtlanticcouldthisdynamiceffectcanlocallyreachupto1m,resultinmajorchangesinTHCstrength(ManabeanddependingontheinitialTHCstrength.

5、InsomeregionsStouffer,1993;StockerandSchmittner,1997;Rahm-therateofchangecanbeupto20–25mm/yr.Thestorf,1999;RahmstorfandGanopolski,1999;Woodemergingpatternsarediscussedwithrespecttotheetal.,1999;Schaefferetal.,2002).Recentobservationsoceaniccirculationchange

6、s.Mostprominentisasouth-showanincreaseby7%inriverdischargetotheArcticnorthgradientreflectingthechangesingeostrophicOcean(Petersonetal.,2002)between1936and1999andsurfacecurrents.OurresultssuggestthatananalysisofasignificantfresheningoftheAtlanticOceanduringt

7、heobservedsealevelchangepatternscouldbeusefulforlast40years(Dicksonetal.,2002;Curryetal.,2003).monitoringtheTHCstrength.Exploringpossibleconsequencesofandindicatorsforthermohalinecirculation(THC)changesishenceofgreatimportance.Here,westudythesealeveleffect

8、sofTHCchangesinaseriesofsimulationswithacoupledclimatemodelthatcontainsanoceancirculationmodel1Introductionwithexplicitcalculationofseasurfaceelevation.ItisusefultodistinguishthreetypesofsealevelSealevelinthenorther