Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

 

Publications des scientifiques de l'IRD

Callaghan A. H., Ward B., Vialard Jérôme. (2014). Influence of surface forcing on near-surface and mixing layer turbulence in the tropical Indian Ocean. Deep-Sea Research Part I : Oceanographic Research Papers, 94, 107-123. ISSN 0967-0637

Accès réservé (Intranet IRD) Demander le PDF

Lien direct chez l'éditeur doi:10.1016/j.dsr.2014.08.009

Titre
Influence of surface forcing on near-surface and mixing layer turbulence in the tropical Indian Ocean
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000345820100008
AuteursCallaghan A. H., Ward B., Vialard Jérôme.
SourceDeep-Sea Research Part I : Oceanographic Research Papers, 2014, 94, p. 107-123. ISSN 0967-0637
RésuméAn autonomous upwardly-moving microstructure profiler was used to collect measurements of the rate of dissipation of turbulent kinetic energy (epsilon) in the tropical Indian Ocean during a single diurnal cycle, from about 50 m depth to the sea surface. This dataset is one of only a few to resolve upper ocean epsilon over a diurnal cycle from below the active mixing layer up to the air-sea interface. Wind speed was weak with an average value of similar to 5 m s(-1) and the wave field was swell-dominated. Within the wind and wave affected surface layer (WWSL), epsilon values were on the order of 10(-7)-10(-6) W kg(-1) at a depth of 0.75 m and when averaged, were almost a factor of two above classical law of the wall theory, possibly indicative of an additional source of energy from the wave field. Below this depth, epsilon values were closer to wall layer scaling, suggesting that the work of the Reynolds stress on the wind-induced vertical shear was the major source of turbulence within this layer. No evidence of persistent elevated near-surface epsilon characteristic of wave-breaking conditions was found. Profiles collected during night-time displayed relatively constant epsilon values at depths between the WWSL and the base of the mixing layer, characteristic of mixing by convective overturning. Within the remnant layer, depth-averaged values of epsilon started decaying exponentially with an e-folding time of 47 min, about 30 min after the reversal of the total surface net heat flux from oceanic loss to gain.
Plan de classementLimnologie physique / Océanographie physique [032]
Descr. géo.OCEAN INDIEN ; ZONE TROPICALE
LocalisationFonds IRD [F B010063115]
Identifiant IRDfdi:010063115
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010063115

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito