On the influences of the continental shelf bathymetry correction in Prydz Bay, East Antarctica
The bathymetry around Antarctica can govern the shelf sea circulations and play a key role in conditioning water masses. In Prydz Bay, the Prydz Bay Gyre and coastal currents are also determined by the continental shelf topography. However, due to the paucity of beam echo sounding data, the bathymet...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5018193 2023-07-02T03:29:33+02:00 On the influences of the continental shelf bathymetry correction in Prydz Bay, East Antarctica Sun, C. Liu, C. Wang, Z. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018193 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1047 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018193 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-1047 2023-06-11T23:39:54Z The bathymetry around Antarctica can govern the shelf sea circulations and play a key role in conditioning water masses. In Prydz Bay, the Prydz Bay Gyre and coastal currents are also determined by the continental shelf topography. However, due to the paucity of beam echo sounding data, the bathymetric datasets in Prydz Bay still have large uncertainties. With the aid of in situ hydrographic observations, this study focuses on the correction of an up-to-date bathymetric dataset and the resultant influences on the shelf circulation and the basal melting of the ice shelves. The corrected bathymetry mainly improves the biased shallow representations in the uncorrected bathymetric data set, with a maximum change of ~500 m deepening in the eastern flank of Prydz Bay. Sensitivity numerical experiments show that the bathymetric corrections in Prydz Bay have a significant impact on the circulation pattern and onshore warm water intrusions. In addition, the corrected bathymetry markedly decreases the heat transport towards the calving front of the Amery Ice Shelf. The onshore heat transport reduces by ~22.18% from ~5.23×10 13 J s -1 to ~4.07×10 13 J s -1 over the outer shelf. Over the inner shelf, the heat transport towards the Amery Ice Shelf reduces by ~18.15% from ~5.95×10 13 J s -1 to ~4.87×10 13 J s -1 . Consequently, the temporally and spatially averaged basal melting rate of the Amery Ice Shelf reduces by ~13.04% from ~0.69 m yr -1 to ~0.60 m yr -1 . Conference Object Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf Ice Shelves Prydz Bay GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) East Antarctica Prydz Bay Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
The bathymetry around Antarctica can govern the shelf sea circulations and play a key role in conditioning water masses. In Prydz Bay, the Prydz Bay Gyre and coastal currents are also determined by the continental shelf topography. However, due to the paucity of beam echo sounding data, the bathymetric datasets in Prydz Bay still have large uncertainties. With the aid of in situ hydrographic observations, this study focuses on the correction of an up-to-date bathymetric dataset and the resultant influences on the shelf circulation and the basal melting of the ice shelves. The corrected bathymetry mainly improves the biased shallow representations in the uncorrected bathymetric data set, with a maximum change of ~500 m deepening in the eastern flank of Prydz Bay. Sensitivity numerical experiments show that the bathymetric corrections in Prydz Bay have a significant impact on the circulation pattern and onshore warm water intrusions. In addition, the corrected bathymetry markedly decreases the heat transport towards the calving front of the Amery Ice Shelf. The onshore heat transport reduces by ~22.18% from ~5.23×10 13 J s -1 to ~4.07×10 13 J s -1 over the outer shelf. Over the inner shelf, the heat transport towards the Amery Ice Shelf reduces by ~18.15% from ~5.95×10 13 J s -1 to ~4.87×10 13 J s -1 . Consequently, the temporally and spatially averaged basal melting rate of the Amery Ice Shelf reduces by ~13.04% from ~0.69 m yr -1 to ~0.60 m yr -1 . |
format |
Conference Object |
author |
Sun, C. Liu, C. Wang, Z. |
spellingShingle |
Sun, C. Liu, C. Wang, Z. On the influences of the continental shelf bathymetry correction in Prydz Bay, East Antarctica |
author_facet |
Sun, C. Liu, C. Wang, Z. |
author_sort |
Sun, C. |
title |
On the influences of the continental shelf bathymetry correction in Prydz Bay, East Antarctica |
title_short |
On the influences of the continental shelf bathymetry correction in Prydz Bay, East Antarctica |
title_full |
On the influences of the continental shelf bathymetry correction in Prydz Bay, East Antarctica |
title_fullStr |
On the influences of the continental shelf bathymetry correction in Prydz Bay, East Antarctica |
title_full_unstemmed |
On the influences of the continental shelf bathymetry correction in Prydz Bay, East Antarctica |
title_sort |
on the influences of the continental shelf bathymetry correction in prydz bay, east antarctica |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018193 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
East Antarctica Prydz Bay Amery Amery Ice Shelf |
geographic_facet |
East Antarctica Prydz Bay Amery Amery Ice Shelf |
genre |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf Ice Shelves Prydz Bay |
genre_facet |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf Ice Shelves Prydz Bay |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1047 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018193 |
op_doi |
https://doi.org/10.57757/IUGG23-1047 |
_version_ |
1770275143795343360 |