Publications des scientifiques de l'IRD

Thomas M. D., Treguier A. M., Blanke B., Deshayes Julie, Voldoire A. (2015). A Lagrangian method to isolate the impacts of mixed layer subduction on the meridional overturning circulation in a numerical model. Journal of Climate, 28 (19), p. 7503-7517. ISSN 0894-8755.

Titre du document
A Lagrangian method to isolate the impacts of mixed layer subduction on the meridional overturning circulation in a numerical model
Année de publication
2015
Type de document
Article référencé dans le Web of Science WOS:000361891300005
Auteurs
Thomas M. D., Treguier A. M., Blanke B., Deshayes Julie, Voldoire A.
Source
Journal of Climate, 2015, 28 (19), p. 7503-7517 ISSN 0894-8755
Large differences in the Atlantic meridional overturning circulation (AMOC) exhibited between the available ocean models pose problems as to how they can be interpreted for climate policy. A novel Lagrangian methodology has been developed for use with ocean models that enables a decomposition of the AMOC according to its source waters of subduction from the mixed layer of different geographical regions. The method is described here and used to decompose the AMOC of the Centre National de Recherches Meteorologiques (CNRM) ocean model, which is approximately 4.5 Sv (1 Sv = 10(6) m(3) s(-1)) too weak at 26 degrees N, compared to observations. Contributions from mixed layer subduction to the peak AMOC at 26 degrees N in the model are dominated by the Labrador Sea, which contributes 7.51 Sv; but contributions from the Nordic seas, the Irminger Sea, and the Rockall basin are also important. These waters mostly originate where deep mixed layers border the topographic slopes of the Subpolar Gyre and Nordic seas. The too-weak model AMOC can be explained by weak model representations of the overflow and of Irminger Sea subduction. These are offset by the large Labrador Sea component, which is likely to be too strong as a result of unrealistically distributed and too-deep mixed layers near the shelf.
Plan de classement
Sciences du milieu [021] ; Limnologie physique / Océanographie physique [032]
Description Géographique
ATLANTIQUE
Localisation
Fonds IRD [F B010065835]
Identifiant IRD
fdi:010065835
Contact