The internal melting of landfast sea ice in Prydz Bay, East Antarctica
Abstract Summertime internal melting of Antarctic sea ice is common due to the penetration of solar radiation below the snow and ice surface. We focus on the role of internal melting and heat conduction in generating gap layers within the ice. These often occur approximately 0.1 m below the ice surf...
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crioppubl:10.1088/1748-9326/ac76d9 2024-09-30T14:24:16+00:00 The internal melting of landfast sea ice in Prydz Bay, East Antarctica Zhao, Jiechen Cheng, Bin Vihma, Timo Lu, Peng Han, Hongwei Shu, Qi National Natural Science Foundation of China the European Commission H2020 project Polar Regions in the Earth System 2022 http://dx.doi.org/10.1088/1748-9326/ac76d9 https://iopscience.iop.org/article/10.1088/1748-9326/ac76d9 https://iopscience.iop.org/article/10.1088/1748-9326/ac76d9/pdf unknown IOP Publishing http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining Environmental Research Letters volume 17, issue 7, page 074012 ISSN 1748-9326 journal-article 2022 crioppubl https://doi.org/10.1088/1748-9326/ac76d9 2024-09-09T05:47:44Z Abstract Summertime internal melting of Antarctic sea ice is common due to the penetration of solar radiation below the snow and ice surface. We focus on the role of internal melting and heat conduction in generating gap layers within the ice. These often occur approximately 0.1 m below the ice surface. In a small-scale survey over land-fast sea ice in Prydz Bay, East Antarctica, we observed, for the first time, gap layers 0.6–1.0 m below the surface for both first-year ice and multi-year ice. A 1D snow/ice thermodynamic model successfully simulated snow and ice mass balance and the evolution of the gap layers. Their spatial distribution was largely controlled by snow thickness and ice thickness. A C-shaped ice temperature profile with the lowest values in the middle of the ice layer resulted in heat flux convergence causing downward progression of the internal melt layer. Multidecadal (1979–2019) seasonal simulations showed decreasing air temperature favored a postposed internal melting onset, reduced total internal melt, and delayed potential ice breakup, which indicated a higher chance for local coastal ice to be shifted from first-year ice to multi-year ice. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Prydz Bay Sea ice IOP Publishing Antarctic East Antarctica Prydz Bay Environmental Research Letters 17 7 074012 |
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Abstract Summertime internal melting of Antarctic sea ice is common due to the penetration of solar radiation below the snow and ice surface. We focus on the role of internal melting and heat conduction in generating gap layers within the ice. These often occur approximately 0.1 m below the ice surface. In a small-scale survey over land-fast sea ice in Prydz Bay, East Antarctica, we observed, for the first time, gap layers 0.6–1.0 m below the surface for both first-year ice and multi-year ice. A 1D snow/ice thermodynamic model successfully simulated snow and ice mass balance and the evolution of the gap layers. Their spatial distribution was largely controlled by snow thickness and ice thickness. A C-shaped ice temperature profile with the lowest values in the middle of the ice layer resulted in heat flux convergence causing downward progression of the internal melt layer. Multidecadal (1979–2019) seasonal simulations showed decreasing air temperature favored a postposed internal melting onset, reduced total internal melt, and delayed potential ice breakup, which indicated a higher chance for local coastal ice to be shifted from first-year ice to multi-year ice. |
author2 |
National Natural Science Foundation of China the European Commission H2020 project Polar Regions in the Earth System |
format |
Article in Journal/Newspaper |
author |
Zhao, Jiechen Cheng, Bin Vihma, Timo Lu, Peng Han, Hongwei Shu, Qi |
spellingShingle |
Zhao, Jiechen Cheng, Bin Vihma, Timo Lu, Peng Han, Hongwei Shu, Qi The internal melting of landfast sea ice in Prydz Bay, East Antarctica |
author_facet |
Zhao, Jiechen Cheng, Bin Vihma, Timo Lu, Peng Han, Hongwei Shu, Qi |
author_sort |
Zhao, Jiechen |
title |
The internal melting of landfast sea ice in Prydz Bay, East Antarctica |
title_short |
The internal melting of landfast sea ice in Prydz Bay, East Antarctica |
title_full |
The internal melting of landfast sea ice in Prydz Bay, East Antarctica |
title_fullStr |
The internal melting of landfast sea ice in Prydz Bay, East Antarctica |
title_full_unstemmed |
The internal melting of landfast sea ice in Prydz Bay, East Antarctica |
title_sort |
internal melting of landfast sea ice in prydz bay, east antarctica |
publisher |
IOP Publishing |
publishDate |
2022 |
url |
http://dx.doi.org/10.1088/1748-9326/ac76d9 https://iopscience.iop.org/article/10.1088/1748-9326/ac76d9 https://iopscience.iop.org/article/10.1088/1748-9326/ac76d9/pdf |
geographic |
Antarctic East Antarctica Prydz Bay |
geographic_facet |
Antarctic East Antarctica Prydz Bay |
genre |
Antarc* Antarctic Antarctica East Antarctica Prydz Bay Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Prydz Bay Sea ice |
op_source |
Environmental Research Letters volume 17, issue 7, page 074012 ISSN 1748-9326 |
op_rights |
http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/1748-9326/ac76d9 |
container_title |
Environmental Research Letters |
container_volume |
17 |
container_issue |
7 |
container_start_page |
074012 |
_version_ |
1811640377479790592 |