Arctic sea ice anomalies during the MOSAiC winter 2019/20
During the winter of 2019/2020, as the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) project started its work, the Arctic Oscillation (AO) experienced some of its largest shifts, ranging from a highly negative index in November 2019 to an extremely positive index du...
Published in: | The Cryosphere |
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Copernicus Publications
2022
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Online Access: | https://doi.org/10.5194/tc-16-981-2022 https://tc.copernicus.org/articles/16/981/2022/tc-16-981-2022.pdf https://doaj.org/article/2e37561d4c1948729886a85054f89c01 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:2e37561d4c1948729886a85054f89c01 2023-05-15T14:37:40+02:00 Arctic sea ice anomalies during the MOSAiC winter 2019/20 K. Dethloff W. Maslowski S. Hendricks Y. J. Lee H. F. Goessling T. Krumpen C. Haas D. Handorf R. Ricker V. Bessonov J. J. Cassano J. C. Kinney R. Osinski M. Rex A. Rinke J. Sokolova A. Sommerfeld 2022-03-01 https://doi.org/10.5194/tc-16-981-2022 https://tc.copernicus.org/articles/16/981/2022/tc-16-981-2022.pdf https://doaj.org/article/2e37561d4c1948729886a85054f89c01 en eng Copernicus Publications doi:10.5194/tc-16-981-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/981/2022/tc-16-981-2022.pdf https://doaj.org/article/2e37561d4c1948729886a85054f89c01 undefined The Cryosphere, Vol 16, Pp 981-1005 (2022) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/tc-16-981-2022 2023-01-22T19:23:56Z During the winter of 2019/2020, as the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) project started its work, the Arctic Oscillation (AO) experienced some of its largest shifts, ranging from a highly negative index in November 2019 to an extremely positive index during January–February–March (JFM) 2020. The permanent positive AO phase for the 3 months of JFM 2020 was accompanied by a prevailing positive phase of the Arctic Dipole (AD) pattern. Here we analyze the sea ice thickness (SIT) distribution based on CryoSat-2/SMOS satellite-derived data augmented with results from the hindcast simulation by the fully coupled Regional Arctic System Model (RASM) from November 2019 through March 2020. A notable result of the positive AO phase during JFM 2020 was large SIT anomalies of up to 1.3 m that emerged in the Barents Sea (BS), along the northeastern Canadian coast and in parts of the central Arctic Ocean. These anomalies appear to be driven by nonlinear interactions between thermodynamic and dynamic processes. In particular, in the Barents and Kara seas (BKS), they are a result of enhanced ice growth connected with low-temperature anomalies and the consequence of intensified atmospherically driven sea ice transport and deformations (i.e., ice divergence and shear) in this area. The Davies Strait, the east coast of Greenland and the BS regions are characterized by convergence and divergence changes connected with thinner sea ice at the ice borders along with an enhanced impact of atmospheric wind forcing. Low-pressure anomalies that developed over the eastern Arctic during JFM 2020 increased northerly winds from the cold Arctic Ocean to the BS and accelerated the southward drift of the MOSAiC ice floe. The satellite-derived and simulated sea ice velocity anomalies, which compared well during JFM 2020, indicate a strong acceleration of the Transpolar Drift relative to the mean for the past decade, with intensified speeds of up to 6 km d−1. As a consequence, sea ice transport and ... Article in Journal/Newspaper Arctic Arctic Ocean Barents Sea Greenland Sea ice The Cryosphere Unknown Arctic Arctic Ocean Barents Sea Greenland The Cryosphere 16 3 981 1005 |
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Open Polar |
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op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir K. Dethloff W. Maslowski S. Hendricks Y. J. Lee H. F. Goessling T. Krumpen C. Haas D. Handorf R. Ricker V. Bessonov J. J. Cassano J. C. Kinney R. Osinski M. Rex A. Rinke J. Sokolova A. Sommerfeld Arctic sea ice anomalies during the MOSAiC winter 2019/20 |
topic_facet |
geo envir |
description |
During the winter of 2019/2020, as the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) project started its work, the Arctic Oscillation (AO) experienced some of its largest shifts, ranging from a highly negative index in November 2019 to an extremely positive index during January–February–March (JFM) 2020. The permanent positive AO phase for the 3 months of JFM 2020 was accompanied by a prevailing positive phase of the Arctic Dipole (AD) pattern. Here we analyze the sea ice thickness (SIT) distribution based on CryoSat-2/SMOS satellite-derived data augmented with results from the hindcast simulation by the fully coupled Regional Arctic System Model (RASM) from November 2019 through March 2020. A notable result of the positive AO phase during JFM 2020 was large SIT anomalies of up to 1.3 m that emerged in the Barents Sea (BS), along the northeastern Canadian coast and in parts of the central Arctic Ocean. These anomalies appear to be driven by nonlinear interactions between thermodynamic and dynamic processes. In particular, in the Barents and Kara seas (BKS), they are a result of enhanced ice growth connected with low-temperature anomalies and the consequence of intensified atmospherically driven sea ice transport and deformations (i.e., ice divergence and shear) in this area. The Davies Strait, the east coast of Greenland and the BS regions are characterized by convergence and divergence changes connected with thinner sea ice at the ice borders along with an enhanced impact of atmospheric wind forcing. Low-pressure anomalies that developed over the eastern Arctic during JFM 2020 increased northerly winds from the cold Arctic Ocean to the BS and accelerated the southward drift of the MOSAiC ice floe. The satellite-derived and simulated sea ice velocity anomalies, which compared well during JFM 2020, indicate a strong acceleration of the Transpolar Drift relative to the mean for the past decade, with intensified speeds of up to 6 km d−1. As a consequence, sea ice transport and ... |
format |
Article in Journal/Newspaper |
author |
K. Dethloff W. Maslowski S. Hendricks Y. J. Lee H. F. Goessling T. Krumpen C. Haas D. Handorf R. Ricker V. Bessonov J. J. Cassano J. C. Kinney R. Osinski M. Rex A. Rinke J. Sokolova A. Sommerfeld |
author_facet |
K. Dethloff W. Maslowski S. Hendricks Y. J. Lee H. F. Goessling T. Krumpen C. Haas D. Handorf R. Ricker V. Bessonov J. J. Cassano J. C. Kinney R. Osinski M. Rex A. Rinke J. Sokolova A. Sommerfeld |
author_sort |
K. Dethloff |
title |
Arctic sea ice anomalies during the MOSAiC winter 2019/20 |
title_short |
Arctic sea ice anomalies during the MOSAiC winter 2019/20 |
title_full |
Arctic sea ice anomalies during the MOSAiC winter 2019/20 |
title_fullStr |
Arctic sea ice anomalies during the MOSAiC winter 2019/20 |
title_full_unstemmed |
Arctic sea ice anomalies during the MOSAiC winter 2019/20 |
title_sort |
arctic sea ice anomalies during the mosaic winter 2019/20 |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-981-2022 https://tc.copernicus.org/articles/16/981/2022/tc-16-981-2022.pdf https://doaj.org/article/2e37561d4c1948729886a85054f89c01 |
geographic |
Arctic Arctic Ocean Barents Sea Greenland |
geographic_facet |
Arctic Arctic Ocean Barents Sea Greenland |
genre |
Arctic Arctic Ocean Barents Sea Greenland Sea ice The Cryosphere |
genre_facet |
Arctic Arctic Ocean Barents Sea Greenland Sea ice The Cryosphere |
op_source |
The Cryosphere, Vol 16, Pp 981-1005 (2022) |
op_relation |
doi:10.5194/tc-16-981-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/981/2022/tc-16-981-2022.pdf https://doaj.org/article/2e37561d4c1948729886a85054f89c01 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-16-981-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
3 |
container_start_page |
981 |
op_container_end_page |
1005 |
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