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dc.contributor.authorLoose, Brice  Concept link
dc.contributor.authorJenkins, William J.  Concept link
dc.contributor.authorMoriarty, Roisin  Concept link
dc.contributor.authorBrown, Peter  Concept link
dc.contributor.authorJullion, Loic  Concept link
dc.contributor.authorNaveira Garabato, Alberto C.  Concept link
dc.contributor.authorValdes, Sinhue Torres  Concept link
dc.contributor.authorHoppema, Mario  Concept link
dc.contributor.authorBallentine, Chris  Concept link
dc.contributor.authorMeredith, Michael P.  Concept link
dc.identifier.citationJournal of Geophysical Research: Oceans 121 (2016): 5959–5979en_US
dc.description© The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Journal of Geophysical Research: Oceans 121 (2016): 5959–5979, doi:10.1002/2016JC011809.en_US
dc.description.abstractThe distribution of noble gases and helium isotopes in the dense shelf waters of Antarctica reflects the boundary conditions near the ocean surface: air-sea exchange, sea ice formation, and subsurface ice melt. We use a nonlinear least squares solution to determine the value of the recharge temperature and salinity, as well as the excess air injection and glacial meltwater content throughout the water column and in the precursor to Antarctic Bottom Water. The noble gas-derived recharge temperature and salinity in the Weddell Gyre are −1.95°C and 34.95 psu near 5500 m; these cold, salty recharge values are a result of surface cooling as well as brine rejection during sea ice formation in Antarctic polynyas. In comparison, the global value for deep water recharge temperature is −0.44°C at 5500 m, which is 1.5°C warmer than the southern hemisphere deep water recharge temperature, reflecting a distinct contribution from the north Atlantic. The contrast between northern and southern hemisphere recharge properties highlights the impact of sea ice formation on setting the gas properties in southern sourced deep water. Below 1000 m, glacial meltwater averages 3.5‰ by volume and represents greater than 50% of the excess neon and argon found in the water column. These results indicate glacial melt has a nonnegligible impact on the atmospheric gas content of Antarctic Bottom Water.en_US
dc.description.sponsorshipNational Science Foundation Grant Number: (OCE-0825394)en_US
dc.publisherJohn Wiley & Sonsen_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.subjectMeridional overturning circulationen_US
dc.subjectGlacial meltwateren_US
dc.subjectOcean carbon cycle Southern Ocean upwellingen_US
dc.subjectSea ice processesen_US
dc.titleEstimating the recharge properties of the deep ocean using noble gases and helium isotopesen_US

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Attribution-NonCommercial-NoDerivatives 4.0 International
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 International