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Title: Ice Shelf Basal Melt and Influence on Dense Water Outflow in the Southern Weddell Sea
Authors: Akhoudas, Camille
Sallée, Jean Baptiste
Reverdin, Gilles
Aloisi, Giovanni
Benetti, Marion
Vignes, Lucie
Gelado Caballero, María Dolores 
UNESCO Clasification: 2510 Oceanografía
Keywords: Ice shelves
Freezing points
Ocean circulation
Water masses
Issue Date: 2020
Journal: Journal of geophysical research. Oceans 
Abstract: We use new observations of stable water isotopes from a research cruise in early 2017 to highlight ocean-ice interactions occurring under Filchner-Ronne Ice Shelf, the largest Antarctic ice shelf. In particular, we investigate the properties of Ice Shelf Water with temperature lower than the surface freezing point, in the Filchner Depression. We identify two main flavors of Ice Shelf Water emerging from beneath the Filchner Ice Shelf, which originate from High Salinity Shelf Water end members with distinct characteristics. Furthermore, these two High Salinity Shelf Water end members interact with areas of the ice shelves with different basal properties to produce different versions of Ice Shelf Water. These water masses are associated with different rates of basal melting and refreezing, which we quantify. Ice Shelf Water types that flow out of the ice shelf cavity are composed of 0.4% of mass from ice shelf (melt minus freeze) when sampled at the front of Filchner Ice Shelf. The slightly lighter Ice Shelf Water version mixes directly with ambient water masses as it flows northward on the continental shelf. The resulting Ice Shelf Water mixture with temperature below the surface freezing point ultimately sinks along the continental slope into the deep ocean, as a precursor of the Weddell Sea bottom waters.
ISSN: 2169-9291
DOI: 10.1029/2019JC015710
Source: Journal of Geophysical Research: Oceans[ISSN 2169-9291],v. 125 (2)
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