FN Archimer Export Format
PT J
TI An ERA40-based atmospheric forcing for global ocean circulation models
BT 
AF BRODEAU, Laurent
   BARNIER, Bernard
   TREGUIER, Anne-Marie
   PENDUFF, Thierry
   GULEV, Sergei
AS 1:1;2:;3:2;4:4;5:3;
FF 1:;2:;3:;4:;5:;
C1 CNRS UJF INPG, LEGI, Lab Phys & Ocean, UMR 5519, F-38041 Grenoble, France.
   CNRS IFREMER IRD UBO, LPO, UMR 6523, F-29280 Plouzane, France.
   Russian Acad Sci, PP SIO, Moscow 117218, Russia.
   Florida State Univ, Dept Oceanog, Tallahassee, FL 32306 USA.
C2 CNRS, FRANCE
   CNRS, FRANCE
   RUSSIAN ACAD SCI, RUSSIA
   UNIV FLORIDA STATE, USA
IF 2.081
TC 320
UR https://archimer.ifremer.fr/doc/00000/11154/14032.pdf
LA English
DT Article
DE ;Ocean;Hindcast;Atmospheric forcing;Air sea fluxes;Weather reanalyzes;Satellite
AB We develop, calibrate and test a dataset intended to drive global ocean hindcasts simulations of the last five decades. This dataset provides surface meteorological variables needed to estimate air-sea fluxes and is built from 6-hourly surface atmospheric state variables of ERA40. We first compare the raw fields of ERA40 to the CORE.v1 clataset of Large and Yeager (2004). used here as a reference, and discuss our choice to use daily radiative fluxes and monthly precipitation products extracted from satellite data rather than their ERA40 counterparts. Both datasets lead to excessively high global imbalances of heat and freshwater fluxes when tested with a prescribed climatological sea surface temperature. After identifying unrealistic time discontinuities (induced by changes in the nature of assimilated observations) and obvious global and regional biases in ERA40 fields (by comparison to high quality observations), we propose a set of corrections. Tropical surface air humidity is decreased from 1979 onward, representation of Arctic surface air temperature is improved using recent observations and the wind is globally increased. These corrections lead to a significant decrease of the excessive positive global imbalance of heat. Radiation and precipitation fields are then submitted to a small adjustment (in zonal mean) that yields a near-zero global imbalance of heat and freshwater. A set of 47-year-long simulations is carried out with the coarse-resolution (2 degrees x 2 degrees) version of the NEMO OGCM to assess the sensitivity of the model to the proposed corrections. Model results show that each of the proposed correction contributes to improve the representation of central features of the global ocean circulation. (c) 2009 Elsevier Ltd. All rights reserved.
PY 2010
SO Ocean Modelling
SN 1463-5003
PU Elsevier Sci Ltd
VL 31
IS 3-4
UT 000274134200003
BP 88
EP 104
DI 10.1016/j.ocemod.2009.10.005
ID 11154
ER

EF