An oceanic heat transport pathway to the Amundsen Sea Embayment

TitleAn oceanic heat transport pathway to the Amundsen Sea Embayment
Publication TypeJournal Article
Year of Publication2016
AuthorsRodriguez A.R, Mazloff MR, Gille ST
JournalJournal of Geophysical Research-Oceans
Volume121
Pagination3337-3349
Date Published2016/05
Type of ArticleArticle
ISBN Number2169-9275
Accession NumberWOS:000383466500030
Keywordsantarctic ice-sheet; bottom; circulation; circumpolar deep-water; continental-shelf; inflow; model; pine island glacier; pressure torques; variability; west antarctica
Abstract

The Amundsen Sea Embayment (ASE) on the West Antarctic coastline has been identified as a region of accelerated glacial melting. A Southern Ocean State Estimate (SOSE) is analyzed over the 2005-2010 time period in the Amundsen Sea region. The SOSE oceanic heat budget reveals that the contribution of parameterized small-scale mixing to the heat content of the ASE waters is small compared to advection and local air-sea heat flux, both of which contribute significantly to the heat content of the ASE waters. Above the permanent pycnocline, the local air-sea flux dominates the heat budget and is controlled by seasonal changes in sea ice coverage. Overall, between 2005 and 2010, the model shows a net heating in the surface above the pycnocline within the ASE. Sea water below the permanent pycnocline is isolated from the influence of air-sea heat fluxes, and thus, the divergence of heat advection is the major contributor to increased oceanic heat content of these waters. Oceanic transport of mass and heat into the ASE is dominated by the cross-shelf input and is primarily geostrophic below the permanent pycnocline. Diagnosis of the time-mean SOSE vorticity budget along the continental shelf slope indicates that the cross-shelf transport is sustained by vorticity input from the localized wind-stress curl over the shelf break.

DOI10.1002/2015jc011402
Short TitleJ Geophys Res-Oceans
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