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dc.contributor.authorGebbie, Geoffrey A
dc.contributor.authorHuybers, Peter John
dc.date.accessioned2009-11-05T18:32:06Z
dc.date.issued2006
dc.identifier.citationGebbie, Geoffrey A., and Peter J. Huybers. 2006. Meridional circulation during the Last Glacial Maximum explored through a combination of South Atlantic δ18O observations and a geostrophic inverse model. Geochemistry Geophysics Geosystems 7(11): 1-15.en_US
dc.identifier.issn1525-2027en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:3382983
dc.description.abstractThe vertical profile of meridional transport in the South Atlantic is examined by combining paleoceanographic observations with a geostrophic circulation model using an inverse method. δ 18Ocalcite observations along the margins of the South Atlantic show that upper-ocean cross-basin differences were weaker during the Last Glacial Maximum (LGM) than the Holocene. The δ 18Ocalcite observations can be explained by a shift of water-mass properties without any change in the overturning circulation. Alternatively, they may indicate a reduced LGM cross-basin density difference and, via the thermal wind relation, a reduced vertical shear. Model inversions of δ 18Ocalcite are found to require meridional transports different from the modern only after three assumptions are made: temperature and salinity distributions are spatially smooth, the relationship between salinity and δ 18Owater is linear and spatially invariant, and LGM temperatures are known to within 1°C along the margins. The last assumption is necessary because an independent constraint on temperature or salinity is required to determine density from δ 18Ocalcite observations. δ 18Ocalcite observations are clearly useful, but before any firm constraints can be placed on LGM meridional transport, it appears necessary to better determine the relationship between δ 18Ocalcite and density.en_US
dc.description.sponsorshipEarth and Planetary Sciencesen_US
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.isversionofhttp://dx.doi.org/10.1029/2006GC001383en_US
dc.relation.hasversionhttp://www.people.fas.harvard.edu/~phuybers/en_US
dash.licenseLAA
dc.subjectinverse modelingen_US
dc.subjectLast Glacial Maximumen_US
dc.subjectmeridional ocean circulationen_US
dc.subjectgeostrophyen_US
dc.titleMeridional Circulation During the Last Glacial Maximum Explored Through a Combination of South Atlantic δ18O Observations and a Geostrophic Inverse Modelen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalGeochemistry Geophysics Geosystemsen_US
dash.depositing.authorHuybers, Peter John
dc.date.available2009-11-05T18:32:06Z
dc.identifier.doi10.1029/2006GC001383*
dash.contributor.affiliatedGebbie, Geoffrey A
dash.contributor.affiliatedHuybers, Peter


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