Evolution of the tidal semi-diurnal constituent M2 at Brest from 1846 to 2005

The work of searching, recovering and quality control of ancient sea-level measurements at Brest is presented. This work enables us to complete a study carried out by Cartwright in 1972, which showed a decrease in the tidal M2 semi-diurnal amplitude of 1% per century. After including these ancient d...

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Veröffentlicht in:Comptes rendus. Geoscience 2006-01, Vol.338 (11), p.802-808
Hauptverfasser: Pouvreau, N, Martin Miguez, B, Miguez, N M, Simon, B, Woppelmann , G
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container_issue 11
container_start_page 802
container_title Comptes rendus. Geoscience
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creator Pouvreau, N
Martin Miguez, B
Miguez, N M
Simon, B
Woppelmann , G
description The work of searching, recovering and quality control of ancient sea-level measurements at Brest is presented. This work enables us to complete a study carried out by Cartwright in 1972, which showed a decrease in the tidal M2 semi-diurnal amplitude of 1% per century. After including these ancient data, as well as the last four decades of observations in the analysis, our results show an increase of the amplitude of M2 after 1960 and a decrease before 1880, suggesting a long-period oscillation rather than a steady secular trend.Original Abstract: Cet article presente notre travail d'enquete, de sauvetage et de controle qualite autour des mesures anciennes du niveau de la mer a Brest, que nous avons decouvertes recemment dans les archives historiques. Leur analyse, conjuguee a celle des observations accumulees depuis 1960, nous a permis de completer l'etude menee en 1972 par Cartwright, qui concluait a une attenuation signi- ficative et reguliere de l'amplitude de l'onde de maree semi-diurne M2 de 1% par siecle. Nos resultats montrent une augmentation de cette amplitude depuis 1960, ainsi qu'une diminution avant 1880; ils suggerent davantage un phenomene cyclique a longue periode plutot qu'une tendance seculaire.
doi_str_mv 10.1016/j.crte.2006.07.003
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title Evolution of the tidal semi-diurnal constituent M2 at Brest from 1846 to 2005
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