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 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 rem...
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Copernicus Publications
2021
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fttriple:oai:gotriple.eu:oai:doaj.org/article:448d483e96e044e4b0996ec07d2daad5 2023-05-15T17:28:14+02:00 Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018 L. Pineau-Guillou P. Lazure G. Wöppelmann 2021-01-01 https://doi.org/10.5194/os-17-17-2021 https://os.copernicus.org/articles/17/17/2021/os-17-17-2021.pdf https://doaj.org/article/448d483e96e044e4b0996ec07d2daad5 en eng Copernicus Publications doi:10.5194/os-17-17-2021 1812-0784 1812-0792 https://os.copernicus.org/articles/17/17/2021/os-17-17-2021.pdf https://doaj.org/article/448d483e96e044e4b0996ec07d2daad5 undefined Ocean Science, Vol 17, Pp 17-34 (2021) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.5194/os-17-17-2021 2023-01-22T19:11:39Z 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 Unknown Hoek ENVELOPE(-65.050,-65.050,-66.000,-66.000) Ocean Science 17 1 17 34 |
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English |
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geo envir L. Pineau-Guillou P. Lazure G. Wöppelmann 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 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. |
format |
Article in Journal/Newspaper |
author |
L. Pineau-Guillou P. Lazure G. Wöppelmann |
author_facet |
L. Pineau-Guillou P. Lazure G. Wöppelmann |
author_sort |
L. Pineau-Guillou |
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 |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/os-17-17-2021 https://os.copernicus.org/articles/17/17/2021/os-17-17-2021.pdf https://doaj.org/article/448d483e96e044e4b0996ec07d2daad5 |
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 |
Ocean Science, Vol 17, Pp 17-34 (2021) |
op_relation |
doi:10.5194/os-17-17-2021 1812-0784 1812-0792 https://os.copernicus.org/articles/17/17/2021/os-17-17-2021.pdf https://doaj.org/article/448d483e96e044e4b0996ec07d2daad5 |
op_rights |
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_ |
1766120793972932608 |