Please use this identifier to cite or link to this item: http://repositorio.lnec.pt:8080/jspui/handle/123456789/1000225
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dc.contributor.authorDodet, G.pt_BR
dc.contributor.authorBertin, X.pt_BR
dc.contributor.authorTaborda, R.pt_BR
dc.date.accessioned2010-06-07T12:45:24Zpt_BR
dc.date.accessioned2014-10-20T09:52:31Zpt_BR
dc.date.accessioned2016-04-28T14:20:06Z-
dc.date.available2010-06-07T12:45:24Zpt_BR
dc.date.available2014-10-20T09:52:31Zpt_BR
dc.date.available2016-04-28T14:20:06Z-
dc.date.issued2009-11-01pt_BR
dc.identifier.urihttps://repositorio.lnec.pt/jspui/handle/123456789/1000225-
dc.description.abstractOcean surface gravity waves play a major role in many engineering and environmental problems, both in the open ocean and in coastal zones. Therefore, it is essential to improve our knowledge on spatial and temporal variability of wave climate. This study aims at investigating this variability in the North-East Atlantic Ocean (25º W–0º Wand 30º N 60º N), using a 57-year hindcast (1953–2009) obtained with a spectral wave model forced with reanalysis wind fields. The hindcast analysis reveals firstly strong seasonal fluctuations of wave climate, with winters characterized by large and long-period waves of mean direction spreading from south-west to north-west, and summers characterized by smaller and shorter-period waves originating from norther directions. From northern (55º N) to southern (35º N) latitudes, the significant wave height (Hs) decreases by roughly 40%, the mean wave direction (Mwd) rotates clockwise by about 25% while the peak period (Tp) only grows by 5%. These three parameters also exhibit a strong inter-annual variability, particularly when winter-means (from 1st of December to 1st of April) are considered. Linear trend analysis over the studied period shows spatially variable long-term trends, with a significant increase of Hs (up to 0.02 myr-1) and a counter clockwise shift of Mwd (up to -0.1-yr-1) at northern latitude, contrasting with a fairly constant trend for Hs and a clockwise shift of Mwd (up to +0.15-yr-1) at southern latitudes. Longterm trends of Tp are less significant, with still a slight increase in the north-eastern part of the study area (up to +0.01 s yr-1). Eventually, a comparison between the inter-annual variability of the winter-means of the three selected wave parameters and the North Atlantic Oscillation (NAO) reveals: (1) a strong positive correlation between Hs and the NAO index at northern latitudes (correlation coefficient up to R = 0.91) and a significant negative correlation at southern latitudes (up to R = -0.6); (2) no significant correlation for Mwd north of 40_Nand a clear positive correlation southward of 40º N (up to R = 0.8) and (3) a northward increasing correlation for Tp (up to R = 0.8). Long-term trends for Hs, Mwd and Tp are finally explained by a significant increase in the NAO index over the studied period.pt_BR
dc.language.isoengpt_BR
dc.rightsrestrictedAccesspt_BR
dc.subjectWave climate variabilitypt_BR
dc.subjectNao indexpt_BR
dc.subjectNorth-east atlantic oceanpt_BR
dc.subjectLong-term trendspt_BR
dc.titleWave climate variability in the North-East Atlantic Ocean over the six last decadespt_BR
dc.typeworkingPaperpt_BR
dc.description.pagesp. 120-131pt_BR
dc.description.volume31pt_BR
dc.description.sectorDHA/NECpt_BR
dc.description.magazineOcean Modellingpt_BR
Appears in Collections:DHA/NEC - Comunicações a congressos e artigos de revista

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