Large Scale Salinity Anomaly Has Triggered the Recent Decline of Winter Convection in the Greenland Sea
The Greenland Sea is a key region for open ocean convection and ventilation, which exhibit a large variability with periods of strong convection and shutdowns. After a long period of weak winter convection (from the 1970s to the early 1990s), a recovery has been reported, beginning in the 1990s and...
Published in: | Geophysical Research Letters |
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Online Access: | https://hal.science/hal-04334640 https://hal.science/hal-04334640/document https://hal.science/hal-04334640/file/Geophysical%20Research%20Letters%20-%202023%20-%20Almeida%20-%20Large%20Scale%20Salinity%20Anomaly%20Has%20Triggered%20the%20Recent%20Decline%20of%20Winter.pdf https://doi.org/10.1029/2023GL104766 |
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ftccsdartic:oai:HAL:hal-04334640v1 2024-01-14T10:07:13+01:00 Large Scale Salinity Anomaly Has Triggered the Recent Decline of Winter Convection in the Greenland Sea Almeida, Lucas Kolodziejczyk, Nicolas Lique, Camille Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2023-11 https://hal.science/hal-04334640 https://hal.science/hal-04334640/document https://hal.science/hal-04334640/file/Geophysical%20Research%20Letters%20-%202023%20-%20Almeida%20-%20Large%20Scale%20Salinity%20Anomaly%20Has%20Triggered%20the%20Recent%20Decline%20of%20Winter.pdf https://doi.org/10.1029/2023GL104766 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2023GL104766 hal-04334640 https://hal.science/hal-04334640 https://hal.science/hal-04334640/document https://hal.science/hal-04334640/file/Geophysical%20Research%20Letters%20-%202023%20-%20Almeida%20-%20Large%20Scale%20Salinity%20Anomaly%20Has%20Triggered%20the%20Recent%20Decline%20of%20Winter.pdf doi:10.1029/2023GL104766 http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-04334640 Geophysical Research Letters, 2023, 50 (21), e2023GL104766 (10p.). ⟨10.1029/2023GL104766⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2023 ftccsdartic https://doi.org/10.1029/2023GL104766 2023-12-16T23:36:38Z The Greenland Sea is a key region for open ocean convection and ventilation, which exhibit a large variability with periods of strong convection and shutdowns. After a long period of weak winter convection (from the 1970s to the early 1990s), a recovery has been reported, beginning in the 1990s and intensifying in the early 2000s until 2013. Using ISAS, an optimal interpolation product based on Argo observations, we document a recent significant weakening of deep convection between 2014 and 2020, accompanied by a continuous warming of the mixed layer but also a freshening after 2014. These hydrographic changes likely increase the ocean stratification and precondition the shutdown of winter convection. We suggest that these property changes result from a shift of the large scale atmospheric circulation, affecting the source of Atlantic Water to the Nordic seas, causing a freshening of about −0.1 g kg−1 that spreads into the Greenland Sea. Article in Journal/Newspaper Greenland Greenland Sea Nordic Seas Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Geophysical Research Letters 50 21 |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Almeida, Lucas Kolodziejczyk, Nicolas Lique, Camille Large Scale Salinity Anomaly Has Triggered the Recent Decline of Winter Convection in the Greenland Sea |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
The Greenland Sea is a key region for open ocean convection and ventilation, which exhibit a large variability with periods of strong convection and shutdowns. After a long period of weak winter convection (from the 1970s to the early 1990s), a recovery has been reported, beginning in the 1990s and intensifying in the early 2000s until 2013. Using ISAS, an optimal interpolation product based on Argo observations, we document a recent significant weakening of deep convection between 2014 and 2020, accompanied by a continuous warming of the mixed layer but also a freshening after 2014. These hydrographic changes likely increase the ocean stratification and precondition the shutdown of winter convection. We suggest that these property changes result from a shift of the large scale atmospheric circulation, affecting the source of Atlantic Water to the Nordic seas, causing a freshening of about −0.1 g kg−1 that spreads into the Greenland Sea. |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Almeida, Lucas Kolodziejczyk, Nicolas Lique, Camille |
author_facet |
Almeida, Lucas Kolodziejczyk, Nicolas Lique, Camille |
author_sort |
Almeida, Lucas |
title |
Large Scale Salinity Anomaly Has Triggered the Recent Decline of Winter Convection in the Greenland Sea |
title_short |
Large Scale Salinity Anomaly Has Triggered the Recent Decline of Winter Convection in the Greenland Sea |
title_full |
Large Scale Salinity Anomaly Has Triggered the Recent Decline of Winter Convection in the Greenland Sea |
title_fullStr |
Large Scale Salinity Anomaly Has Triggered the Recent Decline of Winter Convection in the Greenland Sea |
title_full_unstemmed |
Large Scale Salinity Anomaly Has Triggered the Recent Decline of Winter Convection in the Greenland Sea |
title_sort |
large scale salinity anomaly has triggered the recent decline of winter convection in the greenland sea |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04334640 https://hal.science/hal-04334640/document https://hal.science/hal-04334640/file/Geophysical%20Research%20Letters%20-%202023%20-%20Almeida%20-%20Large%20Scale%20Salinity%20Anomaly%20Has%20Triggered%20the%20Recent%20Decline%20of%20Winter.pdf https://doi.org/10.1029/2023GL104766 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland Sea Nordic Seas |
genre_facet |
Greenland Greenland Sea Nordic Seas |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-04334640 Geophysical Research Letters, 2023, 50 (21), e2023GL104766 (10p.). ⟨10.1029/2023GL104766⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2023GL104766 hal-04334640 https://hal.science/hal-04334640 https://hal.science/hal-04334640/document https://hal.science/hal-04334640/file/Geophysical%20Research%20Letters%20-%202023%20-%20Almeida%20-%20Large%20Scale%20Salinity%20Anomaly%20Has%20Triggered%20the%20Recent%20Decline%20of%20Winter.pdf doi:10.1029/2023GL104766 |
op_rights |
http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2023GL104766 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
21 |
_version_ |
1788061627965243392 |