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1、Usingoceanobservationsandalargesuite1ofclimatemodels,LawrenceLivermoreNationalLaboratoryscientistshavefoundthatlong-termsalinity2changeshaveastrongerinfluenceonregionalsealevelchangesthanpreviously3thought."Byusinglong-termobservedestimatesofoceansalinityandtemperature
2、changesacrosstheglobe,andcontrastingthesewithmodelsimulations,wehaveuncoveredtheunexpectedlylargeinfluenceofsalinitychangesonoceanbasin-scalesealevelpatterns,"saidLLNLoceanographerPaulDurack,leadauthorofapaperappearingintheNovemberissueofthejournalEnvironmentalResearch
3、Letters.SealevelchangesareoneofthemostpronouncedeffectsofclimatechangeimpactsonEarthandareprimarilydrivenbywarmingoftheglobaloceanalongwithaddedwaterfrommeltingland-basedglaciers4andicesheets.Inadditiontotheseeffects,changesinoceansalinityalsocanaffecttheheightofthesea
4、,bychangingitsdensity5structurefromthesurfacetothebottomoftheocean.Theteamfoundthattherewasalong-term(1950-2008)patterninhalosteric(salinity-driven)sealevelchangesintheglobalocean,withsealevelincreasesoccurringinthePacificOceanandsealeveldecreasesintheAtlantic.Thesesal
5、inity-drivensealevelchangeshavenotbeenthoroughly6investigatedinpreviouslong-termestimatesofsealevelchange.Whenthescientistscontrastedtheseresultswithmodels,theteamfoundthatmodelsalsosimulatedthesebasin-scalepatterns,andthatthemagnitudeofthesechangeswassurprisinglylarge
6、,makingupabout25percentofthetotalsealevelchange."Bycontrastingtwolong-termestimatesofsealevelchangetosimulationsprovidedfromalargesuiteofclimatemodelsimulations,ourresultssuggestthatsalinityhasaprofoundeffectonregionalsealevelchange,"Duracksaid."Thisconclusionsuggestst
7、hatfuturesealevelchangeassessments7mustconsidertheregionalimpactsofsalinity-drivenchanges;thiseffectistoolargetocontinuetoignore."OthercollaboratorsincludeLLNL'sPeterGleckler,alongwithSusanWijffels,anoceanographerfromAustralia'sCommonwealth8ScientificandIndustrialResea
8、rchOrganization(CSIRO).ThestudywasconductedaspartoftheClimateResearchProgramatLawrenceLivermoreNationalLaboratorythro
