FN Archimer Export Format
PT J
TI A simplified atmospheric boundary layer model for an improved representation of air–sea interactions in eddying oceanic models: implementation and first evaluation in NEMO (4.0)
BT 
AF Lemarié, Florian
   Samson, Guillaume
   Redelsperger, Jean-Luc
   Giordani, Hervé
   Brivoal, Théo
   Madec, Gurvan
AS 1:1;2:2;3:3;4:4;5:2;6:1,5;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ. Grenoble Alpes, Inria, CNRS, Grenoble INP, LJK, 38000 Grenoble, France
   Mercator Océan, Toulouse, France
   Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France
   Centre National de Recherches Météorologiques (CNRM), Université de Toulouse, Météo-France, CNRS, Toulouse, France
   Sorbonne Universités (UPMC, Univ Paris 06)-CNRS-IRD-MNHN, LOCEAN Laboratory, Paris, France
C2 UNIV GRENOBLE ALPES, FRANCE
   MERCATOR OCEAN, FRANCE
   CNRS, FRANCE
   CNRM (METEO FRANCE), FRANCE
   UNIV SORBONNE, FRANCE
UM LOPS
IN WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-univ-france
IF 6.892
TC 6
UR https://archimer.ifremer.fr/doc/00679/79085/81536.pdf
   https://archimer.ifremer.fr/doc/00679/79085/81537.pdf
LA English
DT Article
AB A simplified model of the atmospheric boundary layer (ABL) of intermediate complexity between a bulk parameterization and a three-dimensional atmospheric model is developed and integrated to the Nucleus for European Modelling of the Ocean (NEMO) general circulation model. An objective in the derivation of such a simplified model, called ABL1d, is to reach an apt representation in ocean-only numerical simulations of some of the key processes associated with air–sea interactions at the characteristic scales of the oceanic mesoscale. In this paper we describe the formulation of the ABL1d model and the strategy to constrain this model with large-scale atmospheric data available from reanalysis or real-time forecasts. A particular emphasis is on the appropriate choice and calibration of a turbulent closure scheme for the atmospheric boundary layer. This is a key ingredient to properly represent the air–sea interaction processes of interest. We also provide a detailed description of the NEMO-ABL1d coupling infrastructure and its computational efficiency. The resulting simplified model is then tested for several boundary-layer regimes relevant to either ocean–atmosphere or sea-ice–atmosphere coupling. The coupled system is also tested with a realistic 0.25∘ resolution global configuration. The numerical results are evaluated using standard metrics from the literature to quantify the wind–sea-surface-temperature (a.k.a. thermal feedback effect), wind–current (a.k.a. current feedback effect), and ABL–sea-ice couplings. With respect to these metrics, our results show very good agreement with observations and fully coupled ocean–atmosphere models for a computational overhead of about 9 % in terms of elapsed time compared to standard uncoupled simulations. This moderate overhead, largely due to I/O operations, leaves room for further improvement to relax the assumption of horizontal homogeneity behind ABL1d and thus to further improve the realism of the coupling while keeping the flexibility of ocean-only modeling. 
PY 2021
PD JAN
SO Geoscientific Model Development
SN 1991-959X
PU Copernicus GmbH
VL 14
IS 1
UT 000613908500002
BP 543
EP 572
DI 10.5194/gmd-14-543-2021
ID 79085
ER

EF