A long-term proxy for sea ice thickness in the Canadian Arctic: 1996–2020
This study presents a long-term winter sea ice thickness proxy product for the Canadian Arctic based on a random forest regression model – applied to ice charts and scatterometer data, trained on CryoSat-2 observations, and applying an ice type–sea ice thickness correction using the Pan-Arctic Ice O...
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Copernicus Publications
2023
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Online Access: | https://doi.org/10.5194/tc-17-3269-2023 https://doaj.org/article/0d01bb7daa744a858ead324207c559e4 |
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ftdoajarticles:oai:doaj.org/article:0d01bb7daa744a858ead324207c559e4 2023-09-05T13:15:59+02:00 A long-term proxy for sea ice thickness in the Canadian Arctic: 1996–2020 I. A. Glissenaar J. C. Landy D. G. Babb G. J. Dawson S. E. L. Howell 2023-08-01T00:00:00Z https://doi.org/10.5194/tc-17-3269-2023 https://doaj.org/article/0d01bb7daa744a858ead324207c559e4 EN eng Copernicus Publications https://tc.copernicus.org/articles/17/3269/2023/tc-17-3269-2023.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-17-3269-2023 1994-0416 1994-0424 https://doaj.org/article/0d01bb7daa744a858ead324207c559e4 The Cryosphere, Vol 17, Pp 3269-3289 (2023) Environmental sciences GE1-350 Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.5194/tc-17-3269-2023 2023-08-20T00:35:33Z This study presents a long-term winter sea ice thickness proxy product for the Canadian Arctic based on a random forest regression model – applied to ice charts and scatterometer data, trained on CryoSat-2 observations, and applying an ice type–sea ice thickness correction using the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS) – that provides 25 years of sea ice thickness in the Beaufort Sea, Baffin Bay, and, for the first time, the Canadian Arctic Archipelago. An evaluation of the product with in situ sea ice thickness measurements shows that the presented sea ice thickness proxy product correctly estimates the magnitudes of the ice thickness and accurately captures spatial and temporal variability. The product estimates sea ice thickness within 30 to 50 cm uncertainty from the model. The sea ice thickness proxy product shows that sea ice is thinning over most of the Canadian Arctic, with a mean trend of − 0.82 cm yr −1 in April over the whole study area (corresponding to 21 cm thinning over the 25-year record), but that trends vary locally. The Beaufort Sea and Baffin Bay show significant negative trends during all months, though with peaks in November ( − 2.8 cm yr −1 ) and April ( − 1.5 cm yr −1 ), respectively. The Parry Channel, which is part of the Northwest Passage and relevant for shipping, shows significant thinning in autumn. The sea ice thickness proxy product provides, for the first time, the opportunity to study long-term trends and variability in sea ice thickness in the Canadian Arctic, including the narrow channels in the Canadian Arctic Archipelago. Article in Journal/Newspaper Arctic Archipelago Arctic Baffin Bay Baffin Bay Baffin Beaufort Sea Canadian Arctic Archipelago Northwest passage Parry Channel Sea ice The Cryosphere Directory of Open Access Journals: DOAJ Articles Arctic Baffin Bay Canadian Arctic Archipelago Northwest Passage Parry ENVELOPE(-62.417,-62.417,-64.283,-64.283) The Cryosphere 17 8 3269 3289 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 I. A. Glissenaar J. C. Landy D. G. Babb G. J. Dawson S. E. L. Howell A long-term proxy for sea ice thickness in the Canadian Arctic: 1996–2020 |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
This study presents a long-term winter sea ice thickness proxy product for the Canadian Arctic based on a random forest regression model – applied to ice charts and scatterometer data, trained on CryoSat-2 observations, and applying an ice type–sea ice thickness correction using the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS) – that provides 25 years of sea ice thickness in the Beaufort Sea, Baffin Bay, and, for the first time, the Canadian Arctic Archipelago. An evaluation of the product with in situ sea ice thickness measurements shows that the presented sea ice thickness proxy product correctly estimates the magnitudes of the ice thickness and accurately captures spatial and temporal variability. The product estimates sea ice thickness within 30 to 50 cm uncertainty from the model. The sea ice thickness proxy product shows that sea ice is thinning over most of the Canadian Arctic, with a mean trend of − 0.82 cm yr −1 in April over the whole study area (corresponding to 21 cm thinning over the 25-year record), but that trends vary locally. The Beaufort Sea and Baffin Bay show significant negative trends during all months, though with peaks in November ( − 2.8 cm yr −1 ) and April ( − 1.5 cm yr −1 ), respectively. The Parry Channel, which is part of the Northwest Passage and relevant for shipping, shows significant thinning in autumn. The sea ice thickness proxy product provides, for the first time, the opportunity to study long-term trends and variability in sea ice thickness in the Canadian Arctic, including the narrow channels in the Canadian Arctic Archipelago. |
format |
Article in Journal/Newspaper |
author |
I. A. Glissenaar J. C. Landy D. G. Babb G. J. Dawson S. E. L. Howell |
author_facet |
I. A. Glissenaar J. C. Landy D. G. Babb G. J. Dawson S. E. L. Howell |
author_sort |
I. A. Glissenaar |
title |
A long-term proxy for sea ice thickness in the Canadian Arctic: 1996–2020 |
title_short |
A long-term proxy for sea ice thickness in the Canadian Arctic: 1996–2020 |
title_full |
A long-term proxy for sea ice thickness in the Canadian Arctic: 1996–2020 |
title_fullStr |
A long-term proxy for sea ice thickness in the Canadian Arctic: 1996–2020 |
title_full_unstemmed |
A long-term proxy for sea ice thickness in the Canadian Arctic: 1996–2020 |
title_sort |
long-term proxy for sea ice thickness in the canadian arctic: 1996–2020 |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/tc-17-3269-2023 https://doaj.org/article/0d01bb7daa744a858ead324207c559e4 |
long_lat |
ENVELOPE(-62.417,-62.417,-64.283,-64.283) |
geographic |
Arctic Baffin Bay Canadian Arctic Archipelago Northwest Passage Parry |
geographic_facet |
Arctic Baffin Bay Canadian Arctic Archipelago Northwest Passage Parry |
genre |
Arctic Archipelago Arctic Baffin Bay Baffin Bay Baffin Beaufort Sea Canadian Arctic Archipelago Northwest passage Parry Channel Sea ice The Cryosphere |
genre_facet |
Arctic Archipelago Arctic Baffin Bay Baffin Bay Baffin Beaufort Sea Canadian Arctic Archipelago Northwest passage Parry Channel Sea ice The Cryosphere |
op_source |
The Cryosphere, Vol 17, Pp 3269-3289 (2023) |
op_relation |
https://tc.copernicus.org/articles/17/3269/2023/tc-17-3269-2023.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-17-3269-2023 1994-0416 1994-0424 https://doaj.org/article/0d01bb7daa744a858ead324207c559e4 |
op_doi |
https://doi.org/10.5194/tc-17-3269-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
8 |
container_start_page |
3269 |
op_container_end_page |
3289 |
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1776197760912982016 |