Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990–2006.
International audience Combining hydrographic data from the OVIDE (Observatoire de la Variabilité Interannuelle à Decennale/Observatory of the Interannual to Decadal Variability) section (Greenland-Portugal) with Argo and historical CTD data over the period 1990–2006, we estimate the variability of...
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ftccsdartic:oai:HAL:hal-00406205v1 2023-05-15T16:30:08+02:00 Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990–2006. Thierry, V. De Boisséson, E. Mercier, H. Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2008 https://hal.archives-ouvertes.fr/hal-00406205 https://doi.org/10.1029/2007JC004443 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2007JC004443 hal-00406205 https://hal.archives-ouvertes.fr/hal-00406205 doi:10.1029/2007JC004443 ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.archives-ouvertes.fr/hal-00406205 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2008, 113, pp.C04016. ⟨10.1029/2007JC004443⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2008 ftccsdartic https://doi.org/10.1029/2007JC004443 2021-11-28T01:37:32Z International audience Combining hydrographic data from the OVIDE (Observatoire de la Variabilité Interannuelle à Decennale/Observatory of the Interannual to Decadal Variability) section (Greenland-Portugal) with Argo and historical CTD data over the period 1990–2006, we estimate the variability of the core properties of a variety of Subpolar Mode Water (SPMW) observed on the eastern flank of the Reykjanes Ridge. This SPMW acquires its core properties in the winter mixed layer along the eastern side of the Reykjanes Ridge. We find that the February sea surface temperature along the ridge is a proxy for its core temperature. The sources of this mode water are water masses advected by the mean cyclonic circulation in the Iceland Basin. A density compensated tendency for cooling and freshening of the SPMW core properties is observed in the early 1990s. It stops in 1996 and is followed by an increase in temperature and salinity (+1.41°C and +0.11 psu) and a decrease in density (−0.12 kg m−3) until at least 2003. During the entire period, the data do not show any significant modification in the depth of the mode water core while they suggest that the thickness of the layer shrank. The variability of the local air-sea freshwater and heat fluxes cannot explain the observed salinity and temperature variations. They are most likely related to the modifications of the properties of the SPMW sources due to the recently evidenced changes, driven by the North Atlantic Oscillation, in the relative contributions of subtropical waters and subpolar waters in the Iceland Basin. Article in Journal/Newspaper Greenland Iceland North Atlantic North Atlantic oscillation Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Journal of Geophysical Research 113 C4 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Thierry, V. De Boisséson, E. Mercier, H. Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990–2006. |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Combining hydrographic data from the OVIDE (Observatoire de la Variabilité Interannuelle à Decennale/Observatory of the Interannual to Decadal Variability) section (Greenland-Portugal) with Argo and historical CTD data over the period 1990–2006, we estimate the variability of the core properties of a variety of Subpolar Mode Water (SPMW) observed on the eastern flank of the Reykjanes Ridge. This SPMW acquires its core properties in the winter mixed layer along the eastern side of the Reykjanes Ridge. We find that the February sea surface temperature along the ridge is a proxy for its core temperature. The sources of this mode water are water masses advected by the mean cyclonic circulation in the Iceland Basin. A density compensated tendency for cooling and freshening of the SPMW core properties is observed in the early 1990s. It stops in 1996 and is followed by an increase in temperature and salinity (+1.41°C and +0.11 psu) and a decrease in density (−0.12 kg m−3) until at least 2003. During the entire period, the data do not show any significant modification in the depth of the mode water core while they suggest that the thickness of the layer shrank. The variability of the local air-sea freshwater and heat fluxes cannot explain the observed salinity and temperature variations. They are most likely related to the modifications of the properties of the SPMW sources due to the recently evidenced changes, driven by the North Atlantic Oscillation, in the relative contributions of subtropical waters and subpolar waters in the Iceland Basin. |
author2 |
Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-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 |
Thierry, V. De Boisséson, E. Mercier, H. |
author_facet |
Thierry, V. De Boisséson, E. Mercier, H. |
author_sort |
Thierry, V. |
title |
Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990–2006. |
title_short |
Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990–2006. |
title_full |
Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990–2006. |
title_fullStr |
Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990–2006. |
title_full_unstemmed |
Interannual variability of the Subpolar Mode Water properties over the Reykjanes Ridge during 1990–2006. |
title_sort |
interannual variability of the subpolar mode water properties over the reykjanes ridge during 1990–2006. |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.archives-ouvertes.fr/hal-00406205 https://doi.org/10.1029/2007JC004443 |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Greenland Reykjanes |
geographic_facet |
Greenland Reykjanes |
genre |
Greenland Iceland North Atlantic North Atlantic oscillation |
genre_facet |
Greenland Iceland North Atlantic North Atlantic oscillation |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.archives-ouvertes.fr/hal-00406205 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2008, 113, pp.C04016. ⟨10.1029/2007JC004443⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2007JC004443 hal-00406205 https://hal.archives-ouvertes.fr/hal-00406205 doi:10.1029/2007JC004443 |
op_doi |
https://doi.org/10.1029/2007JC004443 |
container_title |
Journal of Geophysical Research |
container_volume |
113 |
container_issue |
C4 |
_version_ |
1766019855731916800 |