Publications des scientifiques de l'IRD

Aucan Jerôme, Ardhuin F. (2013). Infragravity waves in the deep ocean : an upward revision. Geophysical Research Letters, 40 (13), p. 3435-3439. ISSN 0094-8276.

Titre du document
Infragravity waves in the deep ocean : an upward revision
Année de publication
2013
Type de document
Article référencé dans le Web of Science WOS:000326396600035
Auteurs
Aucan Jerôme, Ardhuin F.
Source
Geophysical Research Letters, 2013, 40 (13), p. 3435-3439 ISSN 0094-8276
Ocean infragravity waves are surface gravity waves with periods of several minutes and corresponding wavelengths of up to tens of kilometers. When propagating freely in the deep ocean, these waves are typically small, several centimeters at most, so they have been seldom studied. In the context of future wide-swath altimetry missions, these waves need to be better quantified as they have wavelengths that will be resolved by such instruments. Here, we analyze the global climatology and variability of infragravity waves in the deep ocean using data from over 40 open ocean locations, with depths larger than 2000 m. We show that typical infragravity wave heights are higher than previously estimated, with winter-averaged values up to 11 mm off the U. S. West Coast, and typically less than 6 mm in the tropics. The mid to high latitudes exhibit a strong seasonal cycle consistent with the local variability of the wind-waves, while the tropical Pacific has a higher energy level during the Austral winter that does not correlate well with the local wind-waves, suggesting a remote source for the recorded infragravity waves. These infragravity wave energies are expected to be a significant contribution to the error budget for possible measurements of sea level associated to sub-mesoscale currents at horizontal scales around 10 km. Hence, a global numerical model of infragravity waves will likely be necessary for the analysis of the planned Surface Water Ocean Topography mission.
Plan de classement
Limnologie physique / Océanographie physique [032] ; Géophysique interne [066]
Localisation
Fonds IRD [F B010061309]
Identifiant IRD
fdi:010061309
Contact