On-shelf circulation of warm water toward the Totten Ice Shelf in East Antarctica

Author:

Hirano DaisukeORCID,Tamura TakeshiORCID,Kusahara KazuyaORCID,Fujii Masakazu,Yamazaki KaiheORCID,Nakayama YoshihiroORCID,Ono KazuyaORCID,Itaki Takuya,Aoyama Yuichi,Simizu DaisukeORCID,Mizobata KoheiORCID,Ohshima Kay I.ORCID,Nogi YoshifumiORCID,Rintoul Stephen R.ORCID,van Wijk EsmeeORCID,Greenbaum Jamin S.ORCID,Blankenship Donald D.ORCID,Saito Koji,Aoki ShigeruORCID

Abstract

AbstractThe Totten Glacier in East Antarctica, with an ice volume equivalent to >3.5 m of global sea-level rise, is grounded below sea level and, therefore, vulnerable to ocean forcing. Here, we use bathymetric and oceanographic observations from previously unsampled parts of the Totten continental shelf to reveal on-shelf warm water pathways defined by deep topographic features. Access of warm water to the Totten Ice Shelf (TIS) cavity is facilitated by a deep shelf break, a broad and deep depression on the shelf, a cyclonic circulation that carries warm water to the inner shelf, and deep troughs that provide direct access to the TIS cavity. The temperature of the warmest water reaching the TIS cavity varies by ~0.8 °C on an interannual timescale. Numerical simulations constrained by the updated bathymetry demonstrate that the deep troughs play a critical role in regulating ocean heat transport to the TIS cavity and the subsequent basal melt of the ice shelf.

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary

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