Tracing the North Atlantic Deep Water through the Romanche and Chain fracture zones with chlorofluoromethanes.
International audience Chlorofluoromethanes (CFMs) F-11 and F-12 were measured during August 1991 and November 1992 in the Romanche and Chain Fracture Zones in the equatorial Atlantic. The CFM distributions showed the two familiar signatures of the more recently ventilated North Atlantic Deep Water...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.archives-ouvertes.fr/hal-00271275 https://doi.org/10.1016/S0967-0637(99)00005-9 |
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ftccsdartic:oai:HAL:hal-00271275v1 2023-05-15T13:56:50+02:00 Tracing the North Atlantic Deep Water through the Romanche and Chain fracture zones with chlorofluoromethanes. Messias, Marie-José Andrié, Chantal Mémery, Laurent Mercier, Herlé Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 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) 1999-07 https://hal.archives-ouvertes.fr/hal-00271275 https://doi.org/10.1016/S0967-0637(99)00005-9 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0967-0637(99)00005-9 hal-00271275 https://hal.archives-ouvertes.fr/hal-00271275 doi:10.1016/S0967-0637(99)00005-9 ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.archives-ouvertes.fr/hal-00271275 Deep Sea Research Part I: Oceanographic Research Papers, Elsevier, 1999, 46 (7), pp.1247-1278. ⟨10.1016/S0967-0637(99)00005-9⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 1999 ftccsdartic https://doi.org/10.1016/S0967-0637(99)00005-9 2021-10-17T02:10:37Z International audience Chlorofluoromethanes (CFMs) F-11 and F-12 were measured during August 1991 and November 1992 in the Romanche and Chain Fracture Zones in the equatorial Atlantic. The CFM distributions showed the two familiar signatures of the more recently ventilated North Atlantic Deep Water (NADW) seen in the Deep Western Boundary Current (DWBC). The upper maximum is centered around 1600 m at the level of the Upper North Atlantic Deep water (UNADW) and the deeper maximum around 3800 m at level of the Lower North Atlantic Deep Water (LNADW). These observations suggest a bifurcation at the western boundary, some of the NADW spreading eastward with the LNADW entering the Romanche and the Chain Fracture Zones. The upper core (σ1.5=34.70 kg m -3 ) was observed eastward as far as 5°W. The deep CFM maximum (σ4=45.87 kg m -3 ), associated with an oxygen maximum, decreased dramatically at the sills of the Romanche Fracture Zone: east of the sills, the shape of the CFM profiles reflects mixing and deepening of isopycnals. Mean apparent water "ages" computed from the F-11/F-12 ratio are estimated. Near the bottom, no enrichment in CFMs is detected at the entrance of the fracture zones in the cold water mass originating from the Antarctic Bottom Water flow. Article in Journal/Newspaper Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Antarctic Deep Sea Research Part I: Oceanographic Research Papers 46 7 1247 1278 |
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 Messias, Marie-José Andrié, Chantal Mémery, Laurent Mercier, Herlé Tracing the North Atlantic Deep Water through the Romanche and Chain fracture zones with chlorofluoromethanes. |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Chlorofluoromethanes (CFMs) F-11 and F-12 were measured during August 1991 and November 1992 in the Romanche and Chain Fracture Zones in the equatorial Atlantic. The CFM distributions showed the two familiar signatures of the more recently ventilated North Atlantic Deep Water (NADW) seen in the Deep Western Boundary Current (DWBC). The upper maximum is centered around 1600 m at the level of the Upper North Atlantic Deep water (UNADW) and the deeper maximum around 3800 m at level of the Lower North Atlantic Deep Water (LNADW). These observations suggest a bifurcation at the western boundary, some of the NADW spreading eastward with the LNADW entering the Romanche and the Chain Fracture Zones. The upper core (σ1.5=34.70 kg m -3 ) was observed eastward as far as 5°W. The deep CFM maximum (σ4=45.87 kg m -3 ), associated with an oxygen maximum, decreased dramatically at the sills of the Romanche Fracture Zone: east of the sills, the shape of the CFM profiles reflects mixing and deepening of isopycnals. Mean apparent water "ages" computed from the F-11/F-12 ratio are estimated. Near the bottom, no enrichment in CFMs is detected at the entrance of the fracture zones in the cold water mass originating from the Antarctic Bottom Water flow. |
author2 |
Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 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 |
Messias, Marie-José Andrié, Chantal Mémery, Laurent Mercier, Herlé |
author_facet |
Messias, Marie-José Andrié, Chantal Mémery, Laurent Mercier, Herlé |
author_sort |
Messias, Marie-José |
title |
Tracing the North Atlantic Deep Water through the Romanche and Chain fracture zones with chlorofluoromethanes. |
title_short |
Tracing the North Atlantic Deep Water through the Romanche and Chain fracture zones with chlorofluoromethanes. |
title_full |
Tracing the North Atlantic Deep Water through the Romanche and Chain fracture zones with chlorofluoromethanes. |
title_fullStr |
Tracing the North Atlantic Deep Water through the Romanche and Chain fracture zones with chlorofluoromethanes. |
title_full_unstemmed |
Tracing the North Atlantic Deep Water through the Romanche and Chain fracture zones with chlorofluoromethanes. |
title_sort |
tracing the north atlantic deep water through the romanche and chain fracture zones with chlorofluoromethanes. |
publisher |
HAL CCSD |
publishDate |
1999 |
url |
https://hal.archives-ouvertes.fr/hal-00271275 https://doi.org/10.1016/S0967-0637(99)00005-9 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
op_source |
ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.archives-ouvertes.fr/hal-00271275 Deep Sea Research Part I: Oceanographic Research Papers, Elsevier, 1999, 46 (7), pp.1247-1278. ⟨10.1016/S0967-0637(99)00005-9⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0967-0637(99)00005-9 hal-00271275 https://hal.archives-ouvertes.fr/hal-00271275 doi:10.1016/S0967-0637(99)00005-9 |
op_doi |
https://doi.org/10.1016/S0967-0637(99)00005-9 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
46 |
container_issue |
7 |
container_start_page |
1247 |
op_container_end_page |
1278 |
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1766264408085889024 |