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dc.contributor.authorLauderdale, Jonathan
dc.contributor.authorGarabato, Alberto C. Naveira
dc.contributor.authorOliver, Kevin I. C.
dc.contributor.authorFollows, Michael J.
dc.contributor.authorWilliams, Richard G.
dc.date.accessioned2015-07-22T18:16:30Z
dc.date.available2015-07-22T18:16:30Z
dc.date.issued2013-01
dc.date.submitted2012-07
dc.identifier.issn0930-7575
dc.identifier.issn1432-0894
dc.identifier.urihttp://hdl.handle.net/1721.1/97886
dc.description.abstractThe effect of idealized wind-driven circulation changes in the Southern Ocean on atmospheric CO[subscript 2] and the ocean carbon inventory is investigated using a suite of coarse-resolution, global coupled ocean circulation and biogeochemistry experiments with parameterized eddy activity and only modest changes in surface buoyancy forcing, each experiment integrated for 5,000 years. A positive correlation is obtained between the meridional overturning or residual circulation in the Southern Ocean and atmospheric CO[subscript 2]: stronger or northward-shifted westerly winds in the Southern Hemisphere result in increased residual circulation, greater upwelling of carbon-rich deep waters and oceanic outgassing, which increases atmospheric pCO[subscript 2] by ~20 μatm; weaker or southward-shifted winds lead to the opposing result. The ocean carbon inventory in our model varies through contrasting changes in the saturated, disequilibrium and biogenic (soft-tissue and carbonate) reservoirs, each varying by O(10–100) PgC, all of which contribute to the net anomaly in atmospheric CO[subscript 2]. Increased residual overturning deepens the global pycnocline, warming the upper ocean and decreasing the saturated carbon reservoir. Increased upwelling of carbon- and nutrient-rich deep waters and inefficient biological activity results in subduction of unutilized nutrients into the ocean interior, decreasing the biogenic carbon reservoir of intermediate and mode waters ventilating the Northern Hemisphere, and making the disequilibrium carbon reservoir more positive in the mode waters due to the reduced residence time at the surface. Wind-induced changes in the model carbon inventory are dominated by the response of the global pycnocline, although there is an additional abyssal response when the peak westerly winds change their latitude, altering their proximity to Drake Passage and changing the depth extent of the southward return flow of the overturning: a northward shift of the westerly winds isolates dense isopycnals, allowing biogenic carbon to accumulate in the deep ocean of the Southern Hemisphere, while a southward shift shoals dense isopycnals that outcrop in the Southern Ocean and reduces the biogenic carbon store in the deep ocean.en_US
dc.language.isoen_US
dc.publisherSpringer-Verlagen_US
dc.relation.isversionofhttp://dx.doi.org/10.1007/s00382-012-1650-3en_US
dc.rightsCreative Commons Attributionen_US
dc.rights.urihttp://creativecommons.org/en_US
dc.sourceSpringeren_US
dc.titleWind-driven changes in Southern Ocean residual circulation, ocean carbon reservoirs and atmospheric CO[subscript 2]en_US
dc.typeArticleen_US
dc.identifier.citationLauderdale, Jonathan M., Alberto C. Naveira Garabato, Kevin I. C. Oliver, Michael J. Follows, and Richard G. Williams. “Wind-Driven Changes in Southern Ocean Residual Circulation, Ocean Carbon Reservoirs and Atmospheric CO[subscript 2].” Climate Dynamics 41, no. 7–8 (January 12, 2013): 2145–2164.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciencesen_US
dc.contributor.mitauthorFollows, Michael J.en_US
dc.relation.journalClimate Dynamicsen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsLauderdale, Jonathan M.; Garabato, Alberto C. Naveira; Oliver, Kevin I. C.; Follows, Michael J.; Williams, Richard G.en_US
dc.identifier.orcidhttps://orcid.org/0000-0002-3102-0341
mit.licensePUBLISHER_CCen_US


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