Nitsche_etal_2017_Bathymetry-control-ocean-access-Totten_GRL.pdf (1.75 MB)
Bathymetric control of warm ocean water access along the East Antarctic Margin
journal contribution
posted on 2023-05-19, 13:28 authored by Nitsche, FO, Porter, D, Guy Williams, Eva CougnonEva Cougnon, Alexander FraserAlexander Fraser, Correia, R, Guerrero, RObserved thinning of the Totten Glacier in East Antarctica has cast doubt upon the stability of the East Antarctic Ice Sheet. Recent oceanographic observations at the front of the Totten Ice Shelf have confirmed the presence of modified Circumpolar Deep Water (mCDW), which likely promotes enhanced melting. Details of how this water accesses the shelf remain uncertain. Here we present new bathymetry and autumnal oceanographic data from the outer continental shelf, north of the Totten Glacier, that show up to 0.7°C mCDW in a >100 km wide and >500 m deep depression within the shelf break. In other parts of East Antarctica, a shelf break bathymetry shallower than 400 m prevents these warmer waters from entering the shelf environment. Our observations demonstrate that detailed knowledge of the bathymetry is critical to correctly model the across-shelf exchange of warm water to the various glaciers/ice shelves of Antarctica for future sea level prediction.
History
Publication title
Geophysical Research LettersVolume
44Issue
17Pagination
8936-8944ISSN
0094-8276Department/School
Institute for Marine and Antarctic StudiesPublisher
Amer Geophysical UnionPlace of publication
2000 Florida Ave Nw, Washington, USA, Dc, 20009Rights statement
© 2017. American Geophysical UnionRepository Status
- Open