Internal waves and vertical mixing in the Storfjorden Polynya, Svalbard
International audience Latent heat polynya are preferential sites for dense water formation through brine release. The combined action of winds and heat loss leading to sea ice fracture followed by the reactivation of sea ice formation drives this process of dense water formation. The impact of high...
Published in: | Journal of Geophysical Research |
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Main Authors: | , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2011
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Online Access: | https://hal.archives-ouvertes.fr/hal-00755128 https://hal.archives-ouvertes.fr/hal-00755128/document https://hal.archives-ouvertes.fr/hal-00755128/file/2010JC006918.pdf https://doi.org/10.1029/2010JC006918 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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English |
topic |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Jardon, Fernanda Bouruet-Aubertot, Pascale Cuypers, Yannis Vivier, Frédéric Lourenço, Antonio Internal waves and vertical mixing in the Storfjorden Polynya, Svalbard |
topic_facet |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience Latent heat polynya are preferential sites for dense water formation through brine release. The combined action of winds and heat loss leading to sea ice fracture followed by the reactivation of sea ice formation drives this process of dense water formation. The impact of high-frequency dynamics, and especially internal wave breaking, on this process is investigated here, with the analysis of hydrographic observations collected from a drifting mooring in Storfjorden, Svalbard. The main frequency components of the barotropic tide are first revealed by the analysis of a 23-day time series of pressure data. Interestingly the same frequency peaks are isolated by a spectral analysis of isopycnal displacements, suggesting a tidal forcing for these baroclinic waves. The hypothesis of local generation in the Storfjorden is next examined and numerous sites of potential generation are identified specifically for semi-diurnal and sixth-diurnal frequencies. Diurnal baroclinic waves, however, do not appear to be locally generated, but rather popagate cyclonically along the shelf as internal Kelvin waves. The characteristic of these waves and their energy flux are then inferred. A parameterization of dissipation based on the potential energy of the internal wavefield is next proposed and an upper bound for dissipation rate within overturning regions is provided. The most vigorous mixing is associated with brine release events (i.e. strong vertical mixing through thermohaline convection) with eddy diffusivities of up to 10 -3 m 2 s -1 . The background mixing (likely associated with internal wave breaking), however, displays values within [10 -6 , 10 -4 ] m 2 s -1 . This background mixing contributes about O(0.1) W m -2 to the vertical heat flux with a net heating in the bottom layer and cooling in the upper layer. Local heating and cooling rates of the order of 0.025°C month -1 are obtained which is significant with respect to the 0.1°C temperature difference between the bottom and surface layers. |
author2 |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Jardon, Fernanda Bouruet-Aubertot, Pascale Cuypers, Yannis Vivier, Frédéric Lourenço, Antonio |
author_facet |
Jardon, Fernanda Bouruet-Aubertot, Pascale Cuypers, Yannis Vivier, Frédéric Lourenço, Antonio |
author_sort |
Jardon, Fernanda |
title |
Internal waves and vertical mixing in the Storfjorden Polynya, Svalbard |
title_short |
Internal waves and vertical mixing in the Storfjorden Polynya, Svalbard |
title_full |
Internal waves and vertical mixing in the Storfjorden Polynya, Svalbard |
title_fullStr |
Internal waves and vertical mixing in the Storfjorden Polynya, Svalbard |
title_full_unstemmed |
Internal waves and vertical mixing in the Storfjorden Polynya, Svalbard |
title_sort |
internal waves and vertical mixing in the storfjorden polynya, svalbard |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.archives-ouvertes.fr/hal-00755128 https://hal.archives-ouvertes.fr/hal-00755128/document https://hal.archives-ouvertes.fr/hal-00755128/file/2010JC006918.pdf https://doi.org/10.1029/2010JC006918 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Sea ice Storfjorden Svalbard |
genre_facet |
Sea ice Storfjorden Svalbard |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.archives-ouvertes.fr/hal-00755128 Journal of Geophysical Research, American Geophysical Union, 2011, 116, pp.12040. ⟨10.1029/2010JC006918⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2010JC006918 hal-00755128 https://hal.archives-ouvertes.fr/hal-00755128 https://hal.archives-ouvertes.fr/hal-00755128/document https://hal.archives-ouvertes.fr/hal-00755128/file/2010JC006918.pdf BIBCODE: 2011JGRC.11612040J doi:10.1029/2010JC006918 WOS: 000298546100002 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2010JC006918 |
container_title |
Journal of Geophysical Research |
container_volume |
116 |
container_issue |
C12 |
_version_ |
1766194816869203968 |
spelling |
ftccsdartic:oai:HAL:hal-00755128v1 2023-05-15T18:18:17+02:00 Internal waves and vertical mixing in the Storfjorden Polynya, Svalbard Jardon, Fernanda Bouruet-Aubertot, Pascale Cuypers, Yannis Vivier, Frédéric Lourenço, Antonio Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2011-12 https://hal.archives-ouvertes.fr/hal-00755128 https://hal.archives-ouvertes.fr/hal-00755128/document https://hal.archives-ouvertes.fr/hal-00755128/file/2010JC006918.pdf https://doi.org/10.1029/2010JC006918 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2010JC006918 hal-00755128 https://hal.archives-ouvertes.fr/hal-00755128 https://hal.archives-ouvertes.fr/hal-00755128/document https://hal.archives-ouvertes.fr/hal-00755128/file/2010JC006918.pdf BIBCODE: 2011JGRC.11612040J doi:10.1029/2010JC006918 WOS: 000298546100002 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.archives-ouvertes.fr/hal-00755128 Journal of Geophysical Research, American Geophysical Union, 2011, 116, pp.12040. ⟨10.1029/2010JC006918⟩ [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2011 ftccsdartic https://doi.org/10.1029/2010JC006918 2021-12-04T23:44:26Z International audience Latent heat polynya are preferential sites for dense water formation through brine release. The combined action of winds and heat loss leading to sea ice fracture followed by the reactivation of sea ice formation drives this process of dense water formation. The impact of high-frequency dynamics, and especially internal wave breaking, on this process is investigated here, with the analysis of hydrographic observations collected from a drifting mooring in Storfjorden, Svalbard. The main frequency components of the barotropic tide are first revealed by the analysis of a 23-day time series of pressure data. Interestingly the same frequency peaks are isolated by a spectral analysis of isopycnal displacements, suggesting a tidal forcing for these baroclinic waves. The hypothesis of local generation in the Storfjorden is next examined and numerous sites of potential generation are identified specifically for semi-diurnal and sixth-diurnal frequencies. Diurnal baroclinic waves, however, do not appear to be locally generated, but rather popagate cyclonically along the shelf as internal Kelvin waves. The characteristic of these waves and their energy flux are then inferred. A parameterization of dissipation based on the potential energy of the internal wavefield is next proposed and an upper bound for dissipation rate within overturning regions is provided. The most vigorous mixing is associated with brine release events (i.e. strong vertical mixing through thermohaline convection) with eddy diffusivities of up to 10 -3 m 2 s -1 . The background mixing (likely associated with internal wave breaking), however, displays values within [10 -6 , 10 -4 ] m 2 s -1 . This background mixing contributes about O(0.1) W m -2 to the vertical heat flux with a net heating in the bottom layer and cooling in the upper layer. Local heating and cooling rates of the order of 0.025°C month -1 are obtained which is significant with respect to the 0.1°C temperature difference between the bottom and surface layers. Article in Journal/Newspaper Sea ice Storfjorden Svalbard Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Svalbard Journal of Geophysical Research 116 C12 |