Sea ice cover in the Copernicus Arctic Regional Reanalysis
The Copernicus Arctic Regional Reanalysis (CARRA) is a novel regional high-resolution atmospheric reanalysis product that covers a considerable part of the European Arctic including substantial amounts of ice-covered areas. Sea ice in CARRA is modelled by means of a one-dimensional thermodynamic sea...
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Copernicus Publications
2024
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ftdoajarticles:oai:doaj.org/article:043b4bc993484c77a307e14cfb78c92b 2024-09-15T17:35:52+00:00 Sea ice cover in the Copernicus Arctic Regional Reanalysis Y. Batrak B. Cheng V. Kallio-Myers 2024-03-01T00:00:00Z https://doi.org/10.5194/tc-18-1157-2024 https://doaj.org/article/043b4bc993484c77a307e14cfb78c92b EN eng Copernicus Publications https://tc.copernicus.org/articles/18/1157/2024/tc-18-1157-2024.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-18-1157-2024 1994-0416 1994-0424 https://doaj.org/article/043b4bc993484c77a307e14cfb78c92b The Cryosphere, Vol 18, Pp 1157-1183 (2024) Environmental sciences GE1-350 Geology QE1-996.5 article 2024 ftdoajarticles https://doi.org/10.5194/tc-18-1157-2024 2024-08-05T17:49:50Z The Copernicus Arctic Regional Reanalysis (CARRA) is a novel regional high-resolution atmospheric reanalysis product that covers a considerable part of the European Arctic including substantial amounts of ice-covered areas. Sea ice in CARRA is modelled by means of a one-dimensional thermodynamic sea ice parameterisation scheme, which also explicitly resolves the evolution of the snow layer over sea ice. In the present study, we assess the representation of sea ice cover in CARRA and validate it against a wide set of satellite products and observations from ice mass balance buoys. We show that CARRA adequately represents general interannual trends towards thinner and warmer ice in the Arctic. Compared to ERA5, sea ice in CARRA shows a reduced warm bias in the ice surface temperature. The strongest improvement was observed for winter months over the central Arctic and the Greenland and Barents seas where a 4.91 °C median ice surface temperature error in ERA5 is reduced to 1.88 °C in CARRA on average. Over Baffin Bay, intercomparisons suggest the presence of a cold winter-time ice surface temperature bias in CARRA. No improvement over ERA5 was found in the ice surface albedo with spring-time errors in CARRA being up to 0.08 higher on average than those in ERA5 when computed against the CLARA-A2 satellite retrieval product. Summer-time ice surface albedos are comparable in CARRA and ERA5. Sea ice thickness and snow depth in CARRA adequately resolve the annual cycle of sea ice cover in the Arctic and bring added value compared to ERA5. However, limitations of CARRA indicate potential benefits of utilising more advanced approaches for representing sea ice cover in next-generation reanalyses. Article in Journal/Newspaper albedo Baffin Bay Baffin Bay Baffin Greenland Sea ice The Cryosphere ice covered areas Directory of Open Access Journals: DOAJ Articles The Cryosphere 18 3 1157 1183 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 Y. Batrak B. Cheng V. Kallio-Myers Sea ice cover in the Copernicus Arctic Regional Reanalysis |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
The Copernicus Arctic Regional Reanalysis (CARRA) is a novel regional high-resolution atmospheric reanalysis product that covers a considerable part of the European Arctic including substantial amounts of ice-covered areas. Sea ice in CARRA is modelled by means of a one-dimensional thermodynamic sea ice parameterisation scheme, which also explicitly resolves the evolution of the snow layer over sea ice. In the present study, we assess the representation of sea ice cover in CARRA and validate it against a wide set of satellite products and observations from ice mass balance buoys. We show that CARRA adequately represents general interannual trends towards thinner and warmer ice in the Arctic. Compared to ERA5, sea ice in CARRA shows a reduced warm bias in the ice surface temperature. The strongest improvement was observed for winter months over the central Arctic and the Greenland and Barents seas where a 4.91 °C median ice surface temperature error in ERA5 is reduced to 1.88 °C in CARRA on average. Over Baffin Bay, intercomparisons suggest the presence of a cold winter-time ice surface temperature bias in CARRA. No improvement over ERA5 was found in the ice surface albedo with spring-time errors in CARRA being up to 0.08 higher on average than those in ERA5 when computed against the CLARA-A2 satellite retrieval product. Summer-time ice surface albedos are comparable in CARRA and ERA5. Sea ice thickness and snow depth in CARRA adequately resolve the annual cycle of sea ice cover in the Arctic and bring added value compared to ERA5. However, limitations of CARRA indicate potential benefits of utilising more advanced approaches for representing sea ice cover in next-generation reanalyses. |
format |
Article in Journal/Newspaper |
author |
Y. Batrak B. Cheng V. Kallio-Myers |
author_facet |
Y. Batrak B. Cheng V. Kallio-Myers |
author_sort |
Y. Batrak |
title |
Sea ice cover in the Copernicus Arctic Regional Reanalysis |
title_short |
Sea ice cover in the Copernicus Arctic Regional Reanalysis |
title_full |
Sea ice cover in the Copernicus Arctic Regional Reanalysis |
title_fullStr |
Sea ice cover in the Copernicus Arctic Regional Reanalysis |
title_full_unstemmed |
Sea ice cover in the Copernicus Arctic Regional Reanalysis |
title_sort |
sea ice cover in the copernicus arctic regional reanalysis |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/tc-18-1157-2024 https://doaj.org/article/043b4bc993484c77a307e14cfb78c92b |
genre |
albedo Baffin Bay Baffin Bay Baffin Greenland Sea ice The Cryosphere ice covered areas |
genre_facet |
albedo Baffin Bay Baffin Bay Baffin Greenland Sea ice The Cryosphere ice covered areas |
op_source |
The Cryosphere, Vol 18, Pp 1157-1183 (2024) |
op_relation |
https://tc.copernicus.org/articles/18/1157/2024/tc-18-1157-2024.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-18-1157-2024 1994-0416 1994-0424 https://doaj.org/article/043b4bc993484c77a307e14cfb78c92b |
op_doi |
https://doi.org/10.5194/tc-18-1157-2024 |
container_title |
The Cryosphere |
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18 |
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3 |
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1157 |
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1183 |
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1810482802345377792 |