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

IRD

Publications des scientifiques de l'IRD

Waldman R., Somot S., Herrmann Marine, Bosse A., Caniaux G., Estournel C., Houpert L., Prieur L., Sevault F., Testor P. (2017). Modeling the intense 2012-2013 dense water formation event in the northwestern Mediterranean Sea : evaluation with an ensemble simulation approach. Journal of Geophysical Research : Oceans, 122 (2), 1297-1324. ISSN 2169-9275

Accès réservé (Intranet IRD) Document en accès réservé (Intranet IRD)

Lien direct chez l'éditeur doi:10.1002/2016jc012437

Titre
Modeling the intense 2012-2013 dense water formation event in the northwestern Mediterranean Sea : evaluation with an ensemble simulation approach
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000398063100031
AuteursWaldman R., Somot S., Herrmann Marine, Bosse A., Caniaux G., Estournel C., Houpert L., Prieur L., Sevault F., Testor P.
SourceJournal of Geophysical Research : Oceans, 2017, 122 (2), p. 1297-1324. ISSN 2169-9275
RésuméThe northwestern Mediterranean Sea is a well-observed ocean deep convection site. Winter 2012-2013 was an intense and intensely documented dense water formation (DWF) event. We evaluate this DWF event in an ensemble configuration of the regional ocean model NEMOMED12. We then assess for the first time the impact of ocean intrinsic variability on DWF with a novel perturbed initial state ensemble method. Finally, we identify the main physical mechanisms driving water mass transformations. NEMOMED12 reproduces accurately the deep convection chronology between late January and March, its location off the Gulf of Lions although with a southward shift and its magnitude. It fails to reproduce the Western Mediterranean Deep Waters salinification and warming, consistently with too strong a surface heat loss. The Ocean Intrinsic Variability modulates half of the DWF area, especially in the open-sea where the bathymetry slope is low. It modulates marginally (3-5%) the integrated DWF rate, but its increase with time suggests its impact could be larger at interannual timescales. We conclude that ensemble frameworks are necessary to evaluate accurately numerical simulations of DWF. Each phase of DWF has distinct diapycnal and thermohaline regimes: during preconditioning, the Mediterranean thermohaline circulation is driven by exchanges with the Algerian basin. During the intense mixing phase, surface heat fluxes trigger deep convection and internal mixing largely determines the resulting deep water properties. During restratification, lateral exchanges and internal mixing are enhanced. Finally, isopycnal mixing was shown to play a large role in water mass transformations during the preconditioning and restratification phases.
Plan de classementLimnologie physique / Océanographie physique [032]
Descr. géo.MEDITERRANEE
LocalisationFonds IRD [F B010069423]
Identifiant IRDfdi:010069423
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010069423

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)

Nouméa

Papeete

Niamey

Ouagadougou

Tunis

La Paz

Quito