Spatial and Temporal Variability of Atlantic Water in the Arctic From 40 Years of Observations
International audience Atlantic Water (AW) is the largest reservoir of heat in the Arctic Ocean, isolated from the surface and sea ice by a strong halocline. In recent years, AW shoaling and warming are thought to have had an increased influence on sea ice in the Eurasian Basin. In this study, we an...
Published in: | Journal of Geophysical Research: Oceans |
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ftunivbrest:oai:HAL:insu-03868831v1 2023-05-15T14:48:19+02:00 Spatial and Temporal Variability of Atlantic Water in the Arctic From 40 Years of Observations Richards, Alice E. Johnson, Helen L. Lique, Camille Laboratoire Géosciences Océan (LGO) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2022 https://hal-insu.archives-ouvertes.fr/insu-03868831 https://hal-insu.archives-ouvertes.fr/insu-03868831/document https://hal-insu.archives-ouvertes.fr/insu-03868831/file/95619.pdf https://doi.org/10.1029/2021JC018358 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JC018358 insu-03868831 https://hal-insu.archives-ouvertes.fr/insu-03868831 https://hal-insu.archives-ouvertes.fr/insu-03868831/document https://hal-insu.archives-ouvertes.fr/insu-03868831/file/95619.pdf BIBCODE: 2022JGRC.12718358R doi:10.1029/2021JC018358 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal-insu.archives-ouvertes.fr/insu-03868831 Journal of Geophysical Research. Oceans, 2022, 127, ⟨10.1029/2021JC018358⟩ [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2022 ftunivbrest https://doi.org/10.1029/2021JC018358 2023-02-14T23:37:46Z International audience Atlantic Water (AW) is the largest reservoir of heat in the Arctic Ocean, isolated from the surface and sea ice by a strong halocline. In recent years, AW shoaling and warming are thought to have had an increased influence on sea ice in the Eurasian Basin. In this study, we analyze 59,000 profiles from across the Arctic from the 1970s to 2018 to obtain an observationally based pan-Arctic picture of the AW layer, and to quantify temporal and spatial changes. The potential temperature maximum of the AW (the AW core) is found to be an easily detectable, and generally effective metric for assessments of AW properties, although temporal trends in AW core properties do not always reflect those of the entire AW layer. The AW core cools and freshens along the AW advection pathway as the AW loses heat and salt through vertical mixing at its upper bound, as well as via likely interaction with cascading shelf flows. In contrast to the Eurasian Basin, where the AW warms (by approximately 0.7°C between 2002 and 2018) in a pulse-like fashion and has an increased influence on upper ocean heat content, AW in the Canadian Basin cools (by approximately 0.1°C between 2008 and 2018) and becomes more isolated from the surface due to the intensification of the Beaufort Gyre. These opposing AW trends in the Eurasian and Canadian Basins of the Arctic over the last 40 years suggest that AW in these two regions may evolve differently over the coming decades. Article in Journal/Newspaper Arctic Arctic Ocean Sea ice Université de Bretagne Occidentale: HAL Arctic Arctic Ocean Journal of Geophysical Research: Oceans 127 9 |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Richards, Alice E. Johnson, Helen L. Lique, Camille Spatial and Temporal Variability of Atlantic Water in the Arctic From 40 Years of Observations |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Atlantic Water (AW) is the largest reservoir of heat in the Arctic Ocean, isolated from the surface and sea ice by a strong halocline. In recent years, AW shoaling and warming are thought to have had an increased influence on sea ice in the Eurasian Basin. In this study, we analyze 59,000 profiles from across the Arctic from the 1970s to 2018 to obtain an observationally based pan-Arctic picture of the AW layer, and to quantify temporal and spatial changes. The potential temperature maximum of the AW (the AW core) is found to be an easily detectable, and generally effective metric for assessments of AW properties, although temporal trends in AW core properties do not always reflect those of the entire AW layer. The AW core cools and freshens along the AW advection pathway as the AW loses heat and salt through vertical mixing at its upper bound, as well as via likely interaction with cascading shelf flows. In contrast to the Eurasian Basin, where the AW warms (by approximately 0.7°C between 2002 and 2018) in a pulse-like fashion and has an increased influence on upper ocean heat content, AW in the Canadian Basin cools (by approximately 0.1°C between 2008 and 2018) and becomes more isolated from the surface due to the intensification of the Beaufort Gyre. These opposing AW trends in the Eurasian and Canadian Basins of the Arctic over the last 40 years suggest that AW in these two regions may evolve differently over the coming decades. |
author2 |
Laboratoire Géosciences Océan (LGO) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Richards, Alice E. Johnson, Helen L. Lique, Camille |
author_facet |
Richards, Alice E. Johnson, Helen L. Lique, Camille |
author_sort |
Richards, Alice E. |
title |
Spatial and Temporal Variability of Atlantic Water in the Arctic From 40 Years of Observations |
title_short |
Spatial and Temporal Variability of Atlantic Water in the Arctic From 40 Years of Observations |
title_full |
Spatial and Temporal Variability of Atlantic Water in the Arctic From 40 Years of Observations |
title_fullStr |
Spatial and Temporal Variability of Atlantic Water in the Arctic From 40 Years of Observations |
title_full_unstemmed |
Spatial and Temporal Variability of Atlantic Water in the Arctic From 40 Years of Observations |
title_sort |
spatial and temporal variability of atlantic water in the arctic from 40 years of observations |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03868831 https://hal-insu.archives-ouvertes.fr/insu-03868831/document https://hal-insu.archives-ouvertes.fr/insu-03868831/file/95619.pdf https://doi.org/10.1029/2021JC018358 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Sea ice |
genre_facet |
Arctic Arctic Ocean Sea ice |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal-insu.archives-ouvertes.fr/insu-03868831 Journal of Geophysical Research. Oceans, 2022, 127, ⟨10.1029/2021JC018358⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JC018358 insu-03868831 https://hal-insu.archives-ouvertes.fr/insu-03868831 https://hal-insu.archives-ouvertes.fr/insu-03868831/document https://hal-insu.archives-ouvertes.fr/insu-03868831/file/95619.pdf BIBCODE: 2022JGRC.12718358R doi:10.1029/2021JC018358 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2021JC018358 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
9 |
_version_ |
1766319398787743744 |