Low salinity intrusions in the western English Channel
International audience Low salinity (<35) surface waters (LSSW) at the southern entrance to the western English Channel (48.5°N, 5.1°W, near Ushant) were observed in late winter (March-April) in three successive years (2002-04) during near continuous ship of opportunity operations. The source of...
Published in: | Continental Shelf Research |
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Main Authors: | , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2006
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Online Access: | https://hal.science/hal-04115094 https://doi.org/10.1016/j.csr.2006.03.007 |
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École Polytechnique, Université Paris-Saclay: HAL |
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ftepunivpsaclay |
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English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Kelly-Gerreyn, B. A. Hydes, D. J. Jégou, A. M. Lazure, P. Fernand, L. J. Puillat, I. Garcia-Soto, C. Low salinity intrusions in the western English Channel |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Low salinity (<35) surface waters (LSSW) at the southern entrance to the western English Channel (48.5°N, 5.1°W, near Ushant) were observed in late winter (March-April) in three successive years (2002-04) during near continuous ship of opportunity operations. The source of the LSSW is the northward spreading plumes from the Loire (47.5°N, 2.5°W) and Gironde (45.6°N, 1.2°W) along the French Atlantic coast. Fastest plume travel times were associated with northeasterly winds, consistent with Ekman theory. Differences between years in the mean winter (January-March) combined river discharges ( D) was consistent with the minimum salinities ( S min ) of the LSSW (2004: D=4211 m 3 s -1 , S min =33.68; 2003: D=3630 m 3 s -1 , S min =33.90; 2002: D=1579 m 3 s -1 , S min =34.53). Winter mean (1905-74) salinity is otherwise 35.33 near Ushant. The LSSW intruded into the western English Channel in each year, suggesting a common phenomenon. The low salinity intrusion was freshest (mean=35.11±0.21) and most penetrative (reaching 50.7°N, 1.0°W by the end of the year) in 2003 on account of (1) entering on a spring tide giving greater tidal excursion into the western English Channel and (2) intrusion favourable winds (southwesterly/southeasterly) acting on the longer term residual flow. Less penetration occurred in 2004 when the arrival of the LSSW coincided with a neap tide followed by intrusion-resistant northwesterly winds, resulting in a less saline (mean=35.20±0.23) intrusion. In 2004, transport tended to be offshore to at least 100 km from the French Atlantic coast (47°N, 4.8°W-48°N, 4.7°W). In 2002, the lower volume of plume water relative to the other years produced a more saline intrusion (mean=35.25±0.12). Prevailing westerly winds may have pushed this intrusion northwards beyond the route of the ferry, making it difficult to assess the true extent of the intrusion in 2002. A link of the LSSW to phases of the winter North Atlantic Oscillation index from a literature search of the last 84 ... |
author2 |
Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) 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-PSL) 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 |
Kelly-Gerreyn, B. A. Hydes, D. J. Jégou, A. M. Lazure, P. Fernand, L. J. Puillat, I. Garcia-Soto, C. |
author_facet |
Kelly-Gerreyn, B. A. Hydes, D. J. Jégou, A. M. Lazure, P. Fernand, L. J. Puillat, I. Garcia-Soto, C. |
author_sort |
Kelly-Gerreyn, B. A. |
title |
Low salinity intrusions in the western English Channel |
title_short |
Low salinity intrusions in the western English Channel |
title_full |
Low salinity intrusions in the western English Channel |
title_fullStr |
Low salinity intrusions in the western English Channel |
title_full_unstemmed |
Low salinity intrusions in the western English Channel |
title_sort |
low salinity intrusions in the western english channel |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-04115094 https://doi.org/10.1016/j.csr.2006.03.007 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0278-4343 EISSN: 1873-6955 Continental Shelf Research https://hal.science/hal-04115094 Continental Shelf Research, 2006, 26, pp.1241-1257. ⟨10.1016/j.csr.2006.03.007⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.csr.2006.03.007 hal-04115094 https://hal.science/hal-04115094 BIBCODE: 2006CSR.26.1241K doi:10.1016/j.csr.2006.03.007 |
op_doi |
https://doi.org/10.1016/j.csr.2006.03.007 |
container_title |
Continental Shelf Research |
container_volume |
26 |
container_issue |
11 |
container_start_page |
1241 |
op_container_end_page |
1257 |
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1799485598700929024 |
spelling |
ftepunivpsaclay:oai:HAL:hal-04115094v1 2024-05-19T07:45:32+00:00 Low salinity intrusions in the western English Channel Kelly-Gerreyn, B. A. Hydes, D. J. Jégou, A. M. Lazure, P. Fernand, L. J. Puillat, I. Garcia-Soto, C. Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) 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-PSL) 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) 2006 https://hal.science/hal-04115094 https://doi.org/10.1016/j.csr.2006.03.007 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.csr.2006.03.007 hal-04115094 https://hal.science/hal-04115094 BIBCODE: 2006CSR.26.1241K doi:10.1016/j.csr.2006.03.007 ISSN: 0278-4343 EISSN: 1873-6955 Continental Shelf Research https://hal.science/hal-04115094 Continental Shelf Research, 2006, 26, pp.1241-1257. ⟨10.1016/j.csr.2006.03.007⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2006 ftepunivpsaclay https://doi.org/10.1016/j.csr.2006.03.007 2024-04-25T00:35:14Z International audience Low salinity (<35) surface waters (LSSW) at the southern entrance to the western English Channel (48.5°N, 5.1°W, near Ushant) were observed in late winter (March-April) in three successive years (2002-04) during near continuous ship of opportunity operations. The source of the LSSW is the northward spreading plumes from the Loire (47.5°N, 2.5°W) and Gironde (45.6°N, 1.2°W) along the French Atlantic coast. Fastest plume travel times were associated with northeasterly winds, consistent with Ekman theory. Differences between years in the mean winter (January-March) combined river discharges ( D) was consistent with the minimum salinities ( S min ) of the LSSW (2004: D=4211 m 3 s -1 , S min =33.68; 2003: D=3630 m 3 s -1 , S min =33.90; 2002: D=1579 m 3 s -1 , S min =34.53). Winter mean (1905-74) salinity is otherwise 35.33 near Ushant. The LSSW intruded into the western English Channel in each year, suggesting a common phenomenon. The low salinity intrusion was freshest (mean=35.11±0.21) and most penetrative (reaching 50.7°N, 1.0°W by the end of the year) in 2003 on account of (1) entering on a spring tide giving greater tidal excursion into the western English Channel and (2) intrusion favourable winds (southwesterly/southeasterly) acting on the longer term residual flow. Less penetration occurred in 2004 when the arrival of the LSSW coincided with a neap tide followed by intrusion-resistant northwesterly winds, resulting in a less saline (mean=35.20±0.23) intrusion. In 2004, transport tended to be offshore to at least 100 km from the French Atlantic coast (47°N, 4.8°W-48°N, 4.7°W). In 2002, the lower volume of plume water relative to the other years produced a more saline intrusion (mean=35.25±0.12). Prevailing westerly winds may have pushed this intrusion northwards beyond the route of the ferry, making it difficult to assess the true extent of the intrusion in 2002. A link of the LSSW to phases of the winter North Atlantic Oscillation index from a literature search of the last 84 ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation École Polytechnique, Université Paris-Saclay: HAL Continental Shelf Research 26 11 1241 1257 |