Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018
We investigated the long-term changes of the principal tidal component M2 over the North Atlantic coasts, from 1846 to 2018. We analysed 9 tide gauges with time series starting no later than 1920. The longest is Brest with 165 years of observations. We carefully processed the data, particularly to r...
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Online Access: | https://doi.org/10.5194/os-17-17-2021 https://archimer.ifremer.fr/doc/00635/74732/74722.pdf https://archimer.ifremer.fr/doc/00635/74732/80073.pdf https://archimer.ifremer.fr/doc/00635/74732/ |
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fttriple:oai:gotriple.eu:GXl1qQz9N2ttJvSSP-BzM 2023-05-15T17:27:49+02:00 Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018 Pineau-guillou, Lucia Lazure, Pascal Woppelmann, Guy https://doi.org/10.5194/os-17-17-2021 https://archimer.ifremer.fr/doc/00635/74732/74722.pdf https://archimer.ifremer.fr/doc/00635/74732/80073.pdf https://archimer.ifremer.fr/doc/00635/74732/ en eng European Geosciences Union (EGU) Copernicus Publications doi:10.5194/os-17-17-2021 10670/1.jmcxw7 1812-0784 1812-0792 https://archimer.ifremer.fr/doc/00635/74732/74722.pdf https://archimer.ifremer.fr/doc/00635/74732/80073.pdf https://archimer.ifremer.fr/doc/00635/74732/ other undefined Archimer, archive institutionnelle de l'Ifremer Ocean Science (1812-0784) (European Geosciences Union (EGU)), 2021-01 , Vol. 17 , N. 1 , P. 17-34 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ fttriple https://doi.org/10.5194/os-17-17-2021 2023-01-22T17:39:04Z We investigated the long-term changes of the principal tidal component M2 over the North Atlantic coasts, from 1846 to 2018. We analysed 9 tide gauges with time series starting no later than 1920. 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 (Newlyn, Brest, Cuxhaven), whereas some discrepancies appear in the North West Atlantic. The changes started long before the XXth century, and are not linear. The trends vary from a station to another; they are overall positive, up to 0.7 mm/yr. Since 1990, the trends switch from positive to negative values. 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. We discuss a possible underlying mechanism. A different spatial distribution of water heights 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 Unknown Ocean Science 17 1 17 34 |
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geo envir Pineau-guillou, Lucia Lazure, Pascal Woppelmann, Guy Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018 |
topic_facet |
geo envir |
description |
We investigated the long-term changes of the principal tidal component M2 over the North Atlantic coasts, from 1846 to 2018. We analysed 9 tide gauges with time series starting no later than 1920. 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 (Newlyn, Brest, Cuxhaven), whereas some discrepancies appear in the North West Atlantic. The changes started long before the XXth century, and are not linear. The trends vary from a station to another; they are overall positive, up to 0.7 mm/yr. Since 1990, the trends switch from positive to negative values. 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. We discuss a possible underlying mechanism. A different spatial distribution of water heights 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. |
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 |
European Geosciences Union (EGU) |
url |
https://doi.org/10.5194/os-17-17-2021 https://archimer.ifremer.fr/doc/00635/74732/74722.pdf https://archimer.ifremer.fr/doc/00635/74732/80073.pdf https://archimer.ifremer.fr/doc/00635/74732/ |
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 |
Archimer, archive institutionnelle de l'Ifremer Ocean Science (1812-0784) (European Geosciences Union (EGU)), 2021-01 , Vol. 17 , N. 1 , P. 17-34 |
op_relation |
doi:10.5194/os-17-17-2021 10670/1.jmcxw7 1812-0784 1812-0792 https://archimer.ifremer.fr/doc/00635/74732/74722.pdf https://archimer.ifremer.fr/doc/00635/74732/80073.pdf https://archimer.ifremer.fr/doc/00635/74732/ |
op_rights |
other undefined |
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_ |
1766120124105883648 |