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1、Site:WeddellSeaproperPosition:63°42’S50°52’Wto66°37’S27°06’WCategories:operating;Observatory;physical,seaiceSafetydistanceforshipoperations:subsurfacemoorings2nmfromeachmooringShortdescription:·3moorings·Variablesmeasured:currents,T,S,p,seaice(fordetailsse
2、etable1)·Startdateofthetimeseries,serviceinterval:Firstdeployment1989.Interruption1996.Lastredeploymentin2005.Theavailablemooringtechnologyallowstwoyearmooringperiods.TherequiredshiptimeisprovidedbyAWIwiththeicebreakingresearchvessel“Polarstern.”Scientific
3、rationale:IntheWeddellSeapropernewlyformedbottomanddeepwaterisaccumulatedandprovidesanaturallylowpassedrecordofthetimehistoryofbottomanddeepwaterformation.AdditionallytheWeddellSeaproperrepresentsparticulariceconditionswhicharesupposedtoberepresentativefor
4、theAtlanticsectoroftheAntarcticOcean.Themeasurementsconsistoflargescalehydrographicsectionswitharepeatcyclebetween2and4yearsandmooredinstrumentstoavoideffectsofalising.Theobservedparametersareusedtoestimatewatermasspropertiesandtransportsaretemperature,sal
5、inity,CO2,CFCs,currentsandicethickness.ThemooredobservingsystemismaintainedintheWeddellSeaConvectionControl(WECCON)projectsince1996withminormodifications.Currentmetermooringswereredeployedin2005afterabreakin1996.Aredeploymentisplannedfortheaustralsummer200
6、7/2008.Themooringsareequippedwithcurrentmeters,temperatureandconductivitysensorsandsomewithbottompressurerecorders(Tab.1).Additionaltothemoorings,verticallyprofilingfloatsaredeployedinthecontextoftheARGOprogramme.ThemooringscarrysoundsourcesforRAFOSlocatio
7、nofthefloats.Upwardlookingsonarsin150mdepthareinstalledon4mooringsintheframeworkofWCRP’sAntarcticSea-IceThicknessProject(AnSITP)todeterminetheseaicetransports(http://www.awi-bremerhaven.de/Research/IntCoop/Oce/ansitp/index.html).In1989,1990,1993,1996,1998.
8、2005hydrographicsurveyswerecarriedoutintheWeddellSeawithaCTD-probe(Conductivity/Temperature/Depth)combinedwitharosettewatersampler).Arepeatofthistransectisplannedfor2007/2008.XBTsaredeployednorthoftheCTDtrans
