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| Rawat, Arshad; Ardhuin, Fabrice; Ballu, Valerie; Crawford, Wayne; Corela, Carlos; Aucan, Jerome. |
| Ocean infragravity (IG) waves are low-frequency waves generated along shorelines by incident seas and swell and with heights of the order of 1 cm in the open ocean. Despite these small amplitudes, they can be of much importance for ice shelf break up and errors in measurements of sea level by future satellite altimeters. A combination of numerical model results and in situ data is used to show that bottom pressure signals in the infragravity frequency band can be dominated by bursts of energy that travel across ocean basins, and can last for several days. Two particularly strong events recorded in 2008 are studied, one in the North-Pacific and the other in the North-Atlantic. It is shown that infragravity waves can travel across whole oceans basins with... |
| Tipo: Text |
Palavras-chave: Infragravity waves; DART; Global wave model. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00233/34465/32860.pdf |
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| Rawat, Arshad. |
| Wind-generated surface gravity waves are ubiquitous at the ocean surface. Their period varies between 2 and 25 seconds, with wavelength varying between a few meters to several hundreds of meters. Longer and, lower frequency surface gravity waves, called infragravity (IG) waves, are associated to these short, high frequency wind-generated waves. These infragravity waves have dominant periods comprised between 30 seconds and 10 minutes, and, when they propagate freely, with horizontal wavelengths of up to tens of kilometres, as given by the linear surface gravity wave dispersion relation. Outside of surf zones, the vertical amplitude of these infragravity waves is of the order of 1-10 cm, while the amplitude of wind-generated waves is of the order of 1-10... |
| Tipo: Text |
Palavras-chave: Ondes infragravitaires; Modélisation à l'échelle globale; Infragravity waves; SWOT; Global wave model. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00498/60937/64330.pdf |
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| Ardhuin, Fabrice; Rawat, Arshad; Aucan, Jerome. |
| The spectral wave model WAVEWATCH III is extended from the windsea and swell band to lower frequencies, in order to represent free waves in the infragravity (IG) wave band. This extension is based on an empirical source of IG energy, which is defined along shorelines from the significant wave height and a mean period. The empirical proportionality factor is found to reproduce accurately the variations of free IG wave energy in coastal areas, where it was calibrated, and also has a good skill at global scales. In the open ocean, the model is particularly verified for frequencies in the range 5 to 14 mHz for which ocean bottom records are sensitive to the IG signal. The model captures between 30% and 80% of the variance in IG wave heights, depending on... |
| Tipo: Text |
Palavras-chave: Infragravity waves; SWOT; Spectral model. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00181/29272/28639.pdf |
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