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Halo I., Backeberg B., Penven Pierrick, Ansorge I., Reason C., Ullgren J. E. (2014). Eddy properties in the Mozambique Channel : a comparison between observations and two numerical ocean circulation models. In : Barlow R. (ed.), Marsac Francis (ed.), Ternon Jean-Francois (ed.), Roberts M. (ed.) The Mozambique channel : mesoscale dynamics and ecosystem responses. Deep-Sea Research Part II.Topical Studies in Oceanography, 100 (No spécial), 38-53. ISSN 0967-0645

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Lien direct chez l'éditeur doi:10.1016/j.dsr2.2013.10.015

Titre
Eddy properties in the Mozambique Channel : a comparison between observations and two numerical ocean circulation models
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000333721400004
AuteursHalo I., Backeberg B., Penven Pierrick, Ansorge I., Reason C., Ullgren J. E.
InBarlow R. (ed.), Marsac Francis (ed.), Ternon Jean-Francois (ed.), Roberts M. (ed.) The Mozambique channel : mesoscale dynamics and ecosystem responses
SourceDeep-Sea Research Part II.Topical Studies in Oceanography, 2014, 100 (No spécial), p. 38-53. ISSN 0967-0645
RésuméAnalysis of satellite altimetry observations, transports estimates from a mooring array, as well as output from two different numerical ocean circulation models (ROMS and HYCOM), have been used to investigate the mesoscale eddy properties and transport variability in the Mozambique Channel. The power spectral density of model transports at 17 S indicates the models ability to represent the transport variability at mesoscale frequencies (range between 3 yr(-1) and 10 yr(-1)). The models have shown an exaggerated representation of the lower frequencies (<3 yr(-1)), while underestimating the higher frequency signals (> 10 yr(-1)). The overestimation of the seasonal cycle appears in our case not to be related to a misrepresentation of the mesoscale variability. The eddies were identified using an automatic eddy tracking scheme. Both anticyclonic and cyclonic eddies appeared to have a preferred site of formation within the channel. The density distribution showed that the anticyclones exhibited a bi-modal distribution: the first mode was associated with the typical scale for the oceanic mesoscale turbulence, while the second mode was related to the passage of large rings at a frequency of about 4-7 per year. On the other hand, cyclonic eddies had a single mode distribution that follows the first baroclinic Rossby radius of deformation, which is a typical scale for the oceanic mesoscale surface eddy variability, suggesting that their formation is associated with baroclinic instability. Eddy mean amplitudes per class of radius (< 100 km), increase linearly with increasing radius, while no linear relationship exists for the rings. Different from the rings, the increase in the amplitude of the eddies was consistent with the increase of their life expectancy and travelling distances.
Plan de classementLimnologie physique / Océanographie physique [032] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
Descr. géo.MOZAMBIQUE CANAL ; OCEAN INDIEN
LocalisationFonds IRD [F B010061899]
Identifiant IRDfdi:010061899
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010061899

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