Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018
International audience We investigated the long-term changes of the principal tidal component M2 along North Atlantic coasts, from 1846 to 2018. We analysed 18 tide gauges with time series starting no later than 1940. The longest is Brest with 165 years of observations. We carefully processed the da...
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Online Access: | https://hal.science/hal-03126135 https://hal.science/hal-03126135/document https://hal.science/hal-03126135/file/os-17-17-2021.pdf https://doi.org/10.5194/os-17-17-2021 |
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ftunivnantes:oai:HAL:hal-03126135v1 2023-05-15T17:28:24+02:00 Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018 Pineau-Guillou, Lucia Lazure, Pascal Woppelmann, Guy Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Interdisciplinary Graduate School for the Blue planet ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) 2021 https://hal.science/hal-03126135 https://hal.science/hal-03126135/document https://hal.science/hal-03126135/file/os-17-17-2021.pdf https://doi.org/10.5194/os-17-17-2021 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/os-17-17-2021 hal-03126135 https://hal.science/hal-03126135 https://hal.science/hal-03126135/document https://hal.science/hal-03126135/file/os-17-17-2021.pdf doi:10.5194/os-17-17-2021 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-03126135 Ocean Science, 2021, 17 (1), pp.17-34. ⟨10.5194/os-17-17-2021⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2021 ftunivnantes https://doi.org/10.5194/os-17-17-2021 2023-03-08T01:31:32Z International audience We investigated the long-term changes of the principal tidal component M2 along North Atlantic coasts, from 1846 to 2018. We analysed 18 tide gauges with time series starting no later than 1940. The longest is Brest with 165 years of observations. We carefully processed the data, particularly to remove the 18.6-year nodal modulation. We found that M2 variations are consistent at all the stations in the North-East Atlantic (Cuxhaven, Delfzijl, Hoek van Holland, Newlyn, Brest), whereas some discrepancies appear in the North-West Atlantic. The changes started long before the 20th century and are not linear. The secular trends in M2 amplitude vary from one station to another; most of them are positive, up to 2.5 mm/yr at Wilmington since 1910. Since 1990, the trends switch from positive to negative values in the North-East Atlantic. Concerning the possible causes of the observed changes, the similarity between the North Atlantic Oscillation and M2 variations in the North-East Atlantic suggests a possible influence of the large-scale atmospheric circulation on the tide. Our statistical analysis confirms large correlations at all the stations in the North-East Atlantic. We discuss a possible underlying mechanism. A different spatial distribution of mean sea level (corresponding to water depth) from one year to another, depending on the low-frequency sea-level pressure patterns, could impact the propagation of the tide in the North Atlantic basin. However, the hypothesis is at present unproven Article in Journal/Newspaper North Atlantic North Atlantic oscillation North East Atlantic North West Atlantic Université de Nantes: HAL-UNIV-NANTES Hoek ENVELOPE(-65.050,-65.050,-66.000,-66.000) Ocean Science 17 1 17 34 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Pineau-Guillou, Lucia Lazure, Pascal Woppelmann, Guy Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018 |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience We investigated the long-term changes of the principal tidal component M2 along North Atlantic coasts, from 1846 to 2018. We analysed 18 tide gauges with time series starting no later than 1940. The longest is Brest with 165 years of observations. We carefully processed the data, particularly to remove the 18.6-year nodal modulation. We found that M2 variations are consistent at all the stations in the North-East Atlantic (Cuxhaven, Delfzijl, Hoek van Holland, Newlyn, Brest), whereas some discrepancies appear in the North-West Atlantic. The changes started long before the 20th century and are not linear. The secular trends in M2 amplitude vary from one station to another; most of them are positive, up to 2.5 mm/yr at Wilmington since 1910. Since 1990, the trends switch from positive to negative values in the North-East Atlantic. Concerning the possible causes of the observed changes, the similarity between the North Atlantic Oscillation and M2 variations in the North-East Atlantic suggests a possible influence of the large-scale atmospheric circulation on the tide. Our statistical analysis confirms large correlations at all the stations in the North-East Atlantic. We discuss a possible underlying mechanism. A different spatial distribution of mean sea level (corresponding to water depth) from one year to another, depending on the low-frequency sea-level pressure patterns, could impact the propagation of the tide in the North Atlantic basin. However, the hypothesis is at present unproven |
author2 |
Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Interdisciplinary Graduate School for the Blue planet ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) |
format |
Article in Journal/Newspaper |
author |
Pineau-Guillou, Lucia Lazure, Pascal Woppelmann, Guy |
author_facet |
Pineau-Guillou, Lucia Lazure, Pascal Woppelmann, Guy |
author_sort |
Pineau-Guillou, Lucia |
title |
Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018 |
title_short |
Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018 |
title_full |
Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018 |
title_fullStr |
Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018 |
title_full_unstemmed |
Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018 |
title_sort |
large-scale changes of the semidiurnal tide along north atlantic coasts from 1846 to 2018 |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03126135 https://hal.science/hal-03126135/document https://hal.science/hal-03126135/file/os-17-17-2021.pdf https://doi.org/10.5194/os-17-17-2021 |
long_lat |
ENVELOPE(-65.050,-65.050,-66.000,-66.000) |
geographic |
Hoek |
geographic_facet |
Hoek |
genre |
North Atlantic North Atlantic oscillation North East Atlantic North West Atlantic |
genre_facet |
North Atlantic North Atlantic oscillation North East Atlantic North West Atlantic |
op_source |
ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-03126135 Ocean Science, 2021, 17 (1), pp.17-34. ⟨10.5194/os-17-17-2021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/os-17-17-2021 hal-03126135 https://hal.science/hal-03126135 https://hal.science/hal-03126135/document https://hal.science/hal-03126135/file/os-17-17-2021.pdf doi:10.5194/os-17-17-2021 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/os-17-17-2021 |
container_title |
Ocean Science |
container_volume |
17 |
container_issue |
1 |
container_start_page |
17 |
op_container_end_page |
34 |
_version_ |
1766121057030242304 |