Freshwater input and vertical mixing in the Canada Basin’s seasonal halocline: 1975 versus 2006-2012
International audience The seasonal halocline impacts the exchange of heat, energy, and nutrients between the surface and the deeper ocean, and it is changing in response to Arctic sea ice melt over the past several decades. Here, we assess seasonal halocline formation in 1975 and 2006-2012 by compa...
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ftunivbrest:oai:HAL:hal-04203741v1 2024-04-14T08:08:10+00:00 Freshwater input and vertical mixing in the Canada Basin’s seasonal halocline: 1975 versus 2006-2012 Rosenblum, Erica Stroeve, Julienne Gille, Sarah T Tremblay, L Bruno Lique, Camille Fajber, Robert Galley, Ryan Barber, David Loureiro, Thiago Lukovich, Jennifer 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) 2022-07 https://hal.science/hal-04203741 https://hal.science/hal-04203741/document https://hal.science/hal-04203741/file/phoc-JPO-D-21-0116.1.pdf https://doi.org/10.1175/JPO-D-21-0116.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-21-0116.1 hal-04203741 https://hal.science/hal-04203741 https://hal.science/hal-04203741/document https://hal.science/hal-04203741/file/phoc-JPO-D-21-0116.1.pdf doi:10.1175/JPO-D-21-0116.1 info:eu-repo/semantics/OpenAccess ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-04203741 Journal of Physical Oceanography, 2022, 52 (7), pp.1383-1396. ⟨10.1175/JPO-D-21-0116.1⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2022 ftunivbrest https://doi.org/10.1175/JPO-D-21-0116.1 2024-03-21T16:22:40Z International audience The seasonal halocline impacts the exchange of heat, energy, and nutrients between the surface and the deeper ocean, and it is changing in response to Arctic sea ice melt over the past several decades. Here, we assess seasonal halocline formation in 1975 and 2006-2012 by comparing daily, May to September, below-ice salinity profiles collected in the Canada Basin. We evaluate differences between the two time periods using a one-dimensional (1D) bulk model to quantify differences in freshwater input and vertical mixing. The 1D model metrics indicate that two separate factors contribute similarly to stronger stratification in 2006-2012 than in 1975: (1) larger surface freshwater input and (2) less vertical mixing of that freshwater. The first factor is mainly important in August-September, consistent with a longer melt season in recent years. The second factor is mainly important from June until mid-August, when similar levels of freshwater input in 1975 and 2006-2012 are mixed over a different depth range, resulting in different stratification. These results imply that decadal changes to ice-ocean dynamics, in addition to freshwater input, significantly contribute to the stronger seasonal stratification in 2006-2012 than in 1975. The findings highlight the need for near-surface process studies to elucidate the roles of lateral processes and ice-ocean momentum exchange on vertical mixing. Article in Journal/Newspaper Arctic canada basin Sea ice Université de Bretagne Occidentale: HAL Arctic Canada Journal of Physical Oceanography 52 7 1383 1396 |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Rosenblum, Erica Stroeve, Julienne Gille, Sarah T Tremblay, L Bruno Lique, Camille Fajber, Robert Galley, Ryan Barber, David Loureiro, Thiago Lukovich, Jennifer Freshwater input and vertical mixing in the Canada Basin’s seasonal halocline: 1975 versus 2006-2012 |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience The seasonal halocline impacts the exchange of heat, energy, and nutrients between the surface and the deeper ocean, and it is changing in response to Arctic sea ice melt over the past several decades. Here, we assess seasonal halocline formation in 1975 and 2006-2012 by comparing daily, May to September, below-ice salinity profiles collected in the Canada Basin. We evaluate differences between the two time periods using a one-dimensional (1D) bulk model to quantify differences in freshwater input and vertical mixing. The 1D model metrics indicate that two separate factors contribute similarly to stronger stratification in 2006-2012 than in 1975: (1) larger surface freshwater input and (2) less vertical mixing of that freshwater. The first factor is mainly important in August-September, consistent with a longer melt season in recent years. The second factor is mainly important from June until mid-August, when similar levels of freshwater input in 1975 and 2006-2012 are mixed over a different depth range, resulting in different stratification. These results imply that decadal changes to ice-ocean dynamics, in addition to freshwater input, significantly contribute to the stronger seasonal stratification in 2006-2012 than in 1975. The findings highlight the need for near-surface process studies to elucidate the roles of lateral processes and ice-ocean momentum exchange on vertical mixing. |
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 |
Rosenblum, Erica Stroeve, Julienne Gille, Sarah T Tremblay, L Bruno Lique, Camille Fajber, Robert Galley, Ryan Barber, David Loureiro, Thiago Lukovich, Jennifer |
author_facet |
Rosenblum, Erica Stroeve, Julienne Gille, Sarah T Tremblay, L Bruno Lique, Camille Fajber, Robert Galley, Ryan Barber, David Loureiro, Thiago Lukovich, Jennifer |
author_sort |
Rosenblum, Erica |
title |
Freshwater input and vertical mixing in the Canada Basin’s seasonal halocline: 1975 versus 2006-2012 |
title_short |
Freshwater input and vertical mixing in the Canada Basin’s seasonal halocline: 1975 versus 2006-2012 |
title_full |
Freshwater input and vertical mixing in the Canada Basin’s seasonal halocline: 1975 versus 2006-2012 |
title_fullStr |
Freshwater input and vertical mixing in the Canada Basin’s seasonal halocline: 1975 versus 2006-2012 |
title_full_unstemmed |
Freshwater input and vertical mixing in the Canada Basin’s seasonal halocline: 1975 versus 2006-2012 |
title_sort |
freshwater input and vertical mixing in the canada basin’s seasonal halocline: 1975 versus 2006-2012 |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-04203741 https://hal.science/hal-04203741/document https://hal.science/hal-04203741/file/phoc-JPO-D-21-0116.1.pdf https://doi.org/10.1175/JPO-D-21-0116.1 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic canada basin Sea ice |
genre_facet |
Arctic canada basin Sea ice |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-04203741 Journal of Physical Oceanography, 2022, 52 (7), pp.1383-1396. ⟨10.1175/JPO-D-21-0116.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-21-0116.1 hal-04203741 https://hal.science/hal-04203741 https://hal.science/hal-04203741/document https://hal.science/hal-04203741/file/phoc-JPO-D-21-0116.1.pdf doi:10.1175/JPO-D-21-0116.1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JPO-D-21-0116.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
52 |
container_issue |
7 |
container_start_page |
1383 |
op_container_end_page |
1396 |
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1796305594590691328 |