Topography-mediated transport of warm deep water across the continental shelf slope, East Antarctica
Warm Deep Water intrusion over the Antarctic continental shelves threatens the Antarctic ice-sheet stability by enhancing the basal melting of ice shelves. In East Antarctica, the Antarctic Slope Current (ASC), along with the Antarctic Slope Front (ASF), acts as a potential vorticity barrier to prev...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5016138 2023-06-11T04:06:53+02:00 Topography-mediated transport of warm deep water across the continental shelf slope, East Antarctica Liu, C. Wang, Z. Liang, X. Li, X. Cheng, C. Qi, D. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016138 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-0322 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016138 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-0322 2023-04-23T23:38:34Z Warm Deep Water intrusion over the Antarctic continental shelves threatens the Antarctic ice-sheet stability by enhancing the basal melting of ice shelves. In East Antarctica, the Antarctic Slope Current (ASC), along with the Antarctic Slope Front (ASF), acts as a potential vorticity barrier to prevent the warm modified Circumpolar Deep Water (mCDW) from ventilating the cold and fresh shelf. However, mCDW onshore transport is still observed within certain shelf regions, such as submarine troughs running perpendicular to the continental shelf. This study focuses on the dynamic mechanisms governing mCDW intrusion within a submarine trough over the fresh shelf regions, East Antarctica. Based on an idealized eddy-resolving coupled ocean-ice shelf model, two high resolution process-oriented numerical experiments are conducted to reveal the mechanisms responsible for the mCDW onshore transport. Three dynamic mechanisms governing cross-slope mCDW intrusion are identified: 1) the bottom pressure torque, 2) the topography beta spiral, and 3) the topography Rossby waves. These three mechanisms simultaneously govern the mCDW intrusion together. The bottom pressure torque plays a leading role in driving the time-mean onshore flow whose vertical structure is determined by the topography beta spiral, while the topography Rossby waves contribute to the high-frequency oscillations in the onshore volume and heat transport. The simulated spatial distribution and seasonality of mCDW intrusion qualitatively coincide with the observed mCDW intrusion over fresh shelf regions, East Antarctica. Both the topography beta spiral and the ASC play an important role in governing the seasonality of mCDW intrusion. Conference Object Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic East Antarctica The Antarctic |
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Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
Warm Deep Water intrusion over the Antarctic continental shelves threatens the Antarctic ice-sheet stability by enhancing the basal melting of ice shelves. In East Antarctica, the Antarctic Slope Current (ASC), along with the Antarctic Slope Front (ASF), acts as a potential vorticity barrier to prevent the warm modified Circumpolar Deep Water (mCDW) from ventilating the cold and fresh shelf. However, mCDW onshore transport is still observed within certain shelf regions, such as submarine troughs running perpendicular to the continental shelf. This study focuses on the dynamic mechanisms governing mCDW intrusion within a submarine trough over the fresh shelf regions, East Antarctica. Based on an idealized eddy-resolving coupled ocean-ice shelf model, two high resolution process-oriented numerical experiments are conducted to reveal the mechanisms responsible for the mCDW onshore transport. Three dynamic mechanisms governing cross-slope mCDW intrusion are identified: 1) the bottom pressure torque, 2) the topography beta spiral, and 3) the topography Rossby waves. These three mechanisms simultaneously govern the mCDW intrusion together. The bottom pressure torque plays a leading role in driving the time-mean onshore flow whose vertical structure is determined by the topography beta spiral, while the topography Rossby waves contribute to the high-frequency oscillations in the onshore volume and heat transport. The simulated spatial distribution and seasonality of mCDW intrusion qualitatively coincide with the observed mCDW intrusion over fresh shelf regions, East Antarctica. Both the topography beta spiral and the ASC play an important role in governing the seasonality of mCDW intrusion. |
format |
Conference Object |
author |
Liu, C. Wang, Z. Liang, X. Li, X. Cheng, C. Qi, D. |
spellingShingle |
Liu, C. Wang, Z. Liang, X. Li, X. Cheng, C. Qi, D. Topography-mediated transport of warm deep water across the continental shelf slope, East Antarctica |
author_facet |
Liu, C. Wang, Z. Liang, X. Li, X. Cheng, C. Qi, D. |
author_sort |
Liu, C. |
title |
Topography-mediated transport of warm deep water across the continental shelf slope, East Antarctica |
title_short |
Topography-mediated transport of warm deep water across the continental shelf slope, East Antarctica |
title_full |
Topography-mediated transport of warm deep water across the continental shelf slope, East Antarctica |
title_fullStr |
Topography-mediated transport of warm deep water across the continental shelf slope, East Antarctica |
title_full_unstemmed |
Topography-mediated transport of warm deep water across the continental shelf slope, East Antarctica |
title_sort |
topography-mediated transport of warm deep water across the continental shelf slope, east antarctica |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016138 |
geographic |
Antarctic East Antarctica The Antarctic |
geographic_facet |
Antarctic East Antarctica The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-0322 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016138 |
op_doi |
https://doi.org/10.57757/IUGG23-0322 |
_version_ |
1768379091789021184 |