FN Archimer Export Format
PT J
TI A Lagrangian Method to Isolate the Impacts of Mixed Layer Subduction on the Meridional Overturning Circulation in a Numerical Model
BT 
AF THOMAS, Matthew
   TREGUIER, Anne-Marie
   BLANKE, Bruno
   DESHAYES, Julie
   VOLDOIRE, Aurore
AS 1:1;2:1;3:2;4:2,3;5:4;
FF 1:;2:;3:;4:;5:;
C1 CNRS Ifremer IRD UBO, Lab Phys Oceans, UMR 6523, Plouzane, France.
   CNRS Ifremer IRD UBO, Lab Phys Oceans, UMR 6523, Brest, France.
   Univ Cape Town, Dept Oceanog, Int Ctr Educ Marine & Atmospher Sci Africa, ZA-7925 Cape Town, South Africa.
   Meteo France, CNRS, CNRM GAME, Toulouse, France.
C2 CNRS, FRANCE
   CNRS, FRANCE
   UNIV CAPE TOWN, SOUTH AFRICA
   CNRM (METEO FRANCE), FRANCE
UM LOPS
IF 4.85
TC 29
UR https://archimer.ifremer.fr/doc/00284/39523/38016.pdf
LA English
DT Article
DE ;Circulation;Dynamics;Convection;Lagrangian circulation;transport;Meridional overturning circulation;Atm;Ocean Structure;Phenomena;Oceanic mixed layer;Models and modeling;General circulation models
AB 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 Météorologiques (CNRM) ocean model, which is approximately 4.5 Sv (1 Sv = 106 m3 s−1) too weak at 26°N, compared to observations. Contributions from mixed layer subduction to the peak AMOC at 26°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.
PY 2015
PD OCT
SO Journal Of Climate
SN 0894-8755
PU Amer Meteorological Soc
VL 28
IS 19
UT 000361891300005
BP 7503
EP 7517
DI 10.1175/JCLI-D-14-00631.1
ID 39523
ER

EF