Large-eddy simulation of the ice shelf-ocean boundary layer and heterogeneous refreezing rate by sub-ice shelf plume
The role of the refreezing effect in the ice shelf–ocean boundary layer (IOBL) flow with a super-cooled, plume beneath the ice shelf is investigated using the large-eddy simulation. To reveal the detailed physical processes and characteristics of the IOBL flow, a model domain is initialized and forc...
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ftcopernicus:oai:publications.copernicus.org:tcd86454 2023-05-15T16:41:45+02:00 Large-eddy simulation of the ice shelf-ocean boundary layer and heterogeneous refreezing rate by sub-ice shelf plume Na, Ji Sung Kim, Taekyun Jin, Emilia Kyung Yoon, Seung-Tae Lee, Won Sang Yun, Sukyoung Lee, Jiyeon 2020-07-20 application/pdf https://doi.org/10.5194/tc-2020-166 https://tc.copernicus.org/preprints/tc-2020-166/ eng eng doi:10.5194/tc-2020-166 https://tc.copernicus.org/preprints/tc-2020-166/ eISSN: 1994-0424 Text 2020 ftcopernicus https://doi.org/10.5194/tc-2020-166 2020-07-27T16:22:03Z The role of the refreezing effect in the ice shelf–ocean boundary layer (IOBL) flow with a super-cooled, plume beneath the ice shelf is investigated using the large-eddy simulation. To reveal the detailed physical processes and characteristics of the IOBL flow, a model domain is initialized and forced by in situ observations and a comparison is made between two simulations, one with the refreezing effect and one without. The simulated velocity, potential temperature, and salinity field are validated with in situ observations performed in Terra Nova Bay in the western Ross Sea in 2016/2017, confirming that the vertical structures in the simulation results agree well with observations. In particular, it is evident that, when the refreezing effect is considered, the IOBL flow can be more realistically resolved, especially upward advection from the sub-ice shelf plume and the ice front eddy. Beneath the ice shelf, two district regions (the inner and outer regions) are identified based on flow characteristics and the refreezing pattern. In the inner region, stratification and stable conditions are observed with negative momentum flux and low refreezing rates. Meanwhile, in the outer region, high shear impact and unstable conditions with a heat flux of −9 to −52 W m −2 are observed, demonstrating the high refreezing rate and the entrainment of super-cooled water from the sub-ice shelf plume. A total of 94 % of the refreezing events occur in the outer region, with a maximum refreezing rate of 1.86 m yr −1 at the ice front. Text Ice Shelf Ross Sea Copernicus Publications: E-Journals Ross Sea Terra Nova Bay |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
The role of the refreezing effect in the ice shelf–ocean boundary layer (IOBL) flow with a super-cooled, plume beneath the ice shelf is investigated using the large-eddy simulation. To reveal the detailed physical processes and characteristics of the IOBL flow, a model domain is initialized and forced by in situ observations and a comparison is made between two simulations, one with the refreezing effect and one without. The simulated velocity, potential temperature, and salinity field are validated with in situ observations performed in Terra Nova Bay in the western Ross Sea in 2016/2017, confirming that the vertical structures in the simulation results agree well with observations. In particular, it is evident that, when the refreezing effect is considered, the IOBL flow can be more realistically resolved, especially upward advection from the sub-ice shelf plume and the ice front eddy. Beneath the ice shelf, two district regions (the inner and outer regions) are identified based on flow characteristics and the refreezing pattern. In the inner region, stratification and stable conditions are observed with negative momentum flux and low refreezing rates. Meanwhile, in the outer region, high shear impact and unstable conditions with a heat flux of −9 to −52 W m −2 are observed, demonstrating the high refreezing rate and the entrainment of super-cooled water from the sub-ice shelf plume. A total of 94 % of the refreezing events occur in the outer region, with a maximum refreezing rate of 1.86 m yr −1 at the ice front. |
format |
Text |
author |
Na, Ji Sung Kim, Taekyun Jin, Emilia Kyung Yoon, Seung-Tae Lee, Won Sang Yun, Sukyoung Lee, Jiyeon |
spellingShingle |
Na, Ji Sung Kim, Taekyun Jin, Emilia Kyung Yoon, Seung-Tae Lee, Won Sang Yun, Sukyoung Lee, Jiyeon Large-eddy simulation of the ice shelf-ocean boundary layer and heterogeneous refreezing rate by sub-ice shelf plume |
author_facet |
Na, Ji Sung Kim, Taekyun Jin, Emilia Kyung Yoon, Seung-Tae Lee, Won Sang Yun, Sukyoung Lee, Jiyeon |
author_sort |
Na, Ji Sung |
title |
Large-eddy simulation of the ice shelf-ocean boundary layer and heterogeneous refreezing rate by sub-ice shelf plume |
title_short |
Large-eddy simulation of the ice shelf-ocean boundary layer and heterogeneous refreezing rate by sub-ice shelf plume |
title_full |
Large-eddy simulation of the ice shelf-ocean boundary layer and heterogeneous refreezing rate by sub-ice shelf plume |
title_fullStr |
Large-eddy simulation of the ice shelf-ocean boundary layer and heterogeneous refreezing rate by sub-ice shelf plume |
title_full_unstemmed |
Large-eddy simulation of the ice shelf-ocean boundary layer and heterogeneous refreezing rate by sub-ice shelf plume |
title_sort |
large-eddy simulation of the ice shelf-ocean boundary layer and heterogeneous refreezing rate by sub-ice shelf plume |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-2020-166 https://tc.copernicus.org/preprints/tc-2020-166/ |
geographic |
Ross Sea Terra Nova Bay |
geographic_facet |
Ross Sea Terra Nova Bay |
genre |
Ice Shelf Ross Sea |
genre_facet |
Ice Shelf Ross Sea |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2020-166 https://tc.copernicus.org/preprints/tc-2020-166/ |
op_doi |
https://doi.org/10.5194/tc-2020-166 |
_version_ |
1766032224273039360 |