Simulated vertical structure of the ice shelf–ocean boundary current under supercooled condition beneath the Amery Ice Shelf, East Antarctica
The prevalence of supercooled Ice Shelf Water plumes carrying suspended frazil ice underneath the cold-water ice shelves is critically responsible for the marine ice production and the Antarctic Bottom Water formation in Antarctic. However, knowledge of these unique supercooled buoyant flows is stil...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5016155 2023-06-11T04:03:27+02:00 Simulated vertical structure of the ice shelf–ocean boundary current under supercooled condition beneath the Amery Ice Shelf, East Antarctica Cheng, C. Jenkins, A. Wang, Z. Liu, C. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016155 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-0294 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016155 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-0294 2023-04-23T23:38:34Z The prevalence of supercooled Ice Shelf Water plumes carrying suspended frazil ice underneath the cold-water ice shelves is critically responsible for the marine ice production and the Antarctic Bottom Water formation in Antarctic. However, knowledge of these unique supercooled buoyant flows is still limited, let alone their vertical structure. Here we extended the vertical one-dimensional ice shelf–ocean boundary current (ISOBC) model from Jenkins (2016) by incorporating a frazil ice module and the k- turbulence closure. Based on that modified model, we reproduced the measured thermohaline properties of a perennially-prominent supercooled ISOBC underneath the Amery Ice Shelf, East Antarctica, and conducted sensitivity runs to a variety of factors, including advection of scalar quantities, far-field geostrophic currents, basal slope, and frazil ice size distribution. After that, following conclusions can be drawn: 1. the vertical structure of the ISOBC can be hardly reasonably reproduced by adopting a constant eddy viscosity/diffusivity near ice shelf base; 2. the size of the finest ice crystals plays an important role in controlling the ISOBC. 3. the vertical gradient of frazil ice concentration significantly reduces the level of turbulence within the ISOBC. Thus, this study highlights the importance of the strong interaction between the frazil ice formation and the ISOBC thermodynamics. This interaction must not only be included, but also be resolved at high resolutions in three-dimensional coupled ice shelf–ocean models applied to cold-water ice cavities. Conference Object Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Antarctic East Antarctica The Antarctic |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
The prevalence of supercooled Ice Shelf Water plumes carrying suspended frazil ice underneath the cold-water ice shelves is critically responsible for the marine ice production and the Antarctic Bottom Water formation in Antarctic. However, knowledge of these unique supercooled buoyant flows is still limited, let alone their vertical structure. Here we extended the vertical one-dimensional ice shelf–ocean boundary current (ISOBC) model from Jenkins (2016) by incorporating a frazil ice module and the k- turbulence closure. Based on that modified model, we reproduced the measured thermohaline properties of a perennially-prominent supercooled ISOBC underneath the Amery Ice Shelf, East Antarctica, and conducted sensitivity runs to a variety of factors, including advection of scalar quantities, far-field geostrophic currents, basal slope, and frazil ice size distribution. After that, following conclusions can be drawn: 1. the vertical structure of the ISOBC can be hardly reasonably reproduced by adopting a constant eddy viscosity/diffusivity near ice shelf base; 2. the size of the finest ice crystals plays an important role in controlling the ISOBC. 3. the vertical gradient of frazil ice concentration significantly reduces the level of turbulence within the ISOBC. Thus, this study highlights the importance of the strong interaction between the frazil ice formation and the ISOBC thermodynamics. This interaction must not only be included, but also be resolved at high resolutions in three-dimensional coupled ice shelf–ocean models applied to cold-water ice cavities. |
format |
Conference Object |
author |
Cheng, C. Jenkins, A. Wang, Z. Liu, C. |
spellingShingle |
Cheng, C. Jenkins, A. Wang, Z. Liu, C. Simulated vertical structure of the ice shelf–ocean boundary current under supercooled condition beneath the Amery Ice Shelf, East Antarctica |
author_facet |
Cheng, C. Jenkins, A. Wang, Z. Liu, C. |
author_sort |
Cheng, C. |
title |
Simulated vertical structure of the ice shelf–ocean boundary current under supercooled condition beneath the Amery Ice Shelf, East Antarctica |
title_short |
Simulated vertical structure of the ice shelf–ocean boundary current under supercooled condition beneath the Amery Ice Shelf, East Antarctica |
title_full |
Simulated vertical structure of the ice shelf–ocean boundary current under supercooled condition beneath the Amery Ice Shelf, East Antarctica |
title_fullStr |
Simulated vertical structure of the ice shelf–ocean boundary current under supercooled condition beneath the Amery Ice Shelf, East Antarctica |
title_full_unstemmed |
Simulated vertical structure of the ice shelf–ocean boundary current under supercooled condition beneath the Amery Ice Shelf, East Antarctica |
title_sort |
simulated vertical structure of the ice shelf–ocean boundary current under supercooled condition beneath the amery ice shelf, east antarctica |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016155 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Amery Amery Ice Shelf Antarctic East Antarctica The Antarctic |
geographic_facet |
Amery Amery Ice Shelf Antarctic East Antarctica The Antarctic |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica 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/IUGG23-0294 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016155 |
op_doi |
https://doi.org/10.57757/IUGG23-0294 |
_version_ |
1768379696455614464 |