MOSLEF (MODE 2) SUMMER VELOCITY

MOSLEF (MODE 3) SUMMER VELOCITY

PROMES-MOSLEF: An atmosphere-ocean coupled regional model. Coupling and preliminary results over the Mediterranean basin

MWB02

ABSTRACT

Over the last year, in the frame of the Spanish project MERCATOP, the regional atmospheric climate model PROMES and the finite elements semi-Lagrangian ocean model MOSLEF have been integrated in a unique system named PROMES-MOSLEF. OASIS3 coupler has been used as grid interpolator, inter-model communicator and inter-language communicator to link these two models. Currently, the system can be run in four different modes: atmosphere mode, ocean mode with climatological atmospheric feeding, ocean mode with regional modelling atmospheric feeding, and atmosphere-ocean coupled mode. Following MedCordex specifications, the first simulations using the system PROMES-MOSLEF have been focussed in the Mediterranean basin and the ERA-Interim period. In this work preliminary results obtained by using the system are shown and a comparison of those simulations is also presented.

Clemente Gallardo Andrés, Institute of Environmental Sciences – Universidad de Castilla La Mancha, Toledo, Spain

Pedro Galán del Sastre, Department of Applied Mathematics (ETSAM) – Universidad Politécnica de Madrid, Madrid, Spain

Rodolfo Bermejo Bermejo, Department of Applied Mathematics (ETSII) – Universidad Politécnica de Madrid, Madrid, Spain

MOSLEFMOSLEFPROMESPROMES

OASIS-3OASIS-3

INTERF

ACE

INTERF

ACEINTERFACE

INTERFACE

COUPLING

Semi-Lagrangian Finite Element Ocean ModelSemi-Lagrangian Finite Element Ocean Model

Primite Equations of the OceanPrimite Equations of the Ocean

Time DiscretizationTime Discretization• Implicit scheme for diffusion termsImplicit scheme for diffusion terms• Semi-Lagrangian approach for advection termsSemi-Lagrangian approach for advection terms• Splitting scheme to decouple velocity and pressureSplitting scheme to decouple velocity and pressure

Unconditional stable scheme Unconditional stable scheme ΔΔt = 1h 30 mint = 1h 30 min

Spatial DiscretizationSpatial Discretization Finite Element MethodFinite Element Method

• Unstructured meshesUnstructured meshes• Easy definition of the boundaryEasy definition of the boundary• Easy refinement in regionsEasy refinement in regions

Oasis 3 has been used in our coupled model as:Oasis 3 has been used in our coupled model as:• Grid interpolatorGrid interpolator• Inter-model communicatorInter-model communicator• Inter-language communicatorInter-language communicator

Communication technique: CLIM/MPI1Communication technique: CLIM/MPI1

PROMES uses OASIS Box partition type. PROMES uses OASIS Box partition type.

MOSLEF currently uses a Serial partition typeMOSLEF currently uses a Serial partition type

Recent Improvements in the regional atmospheric Recent Improvements in the regional atmospheric model PROMES:model PROMES:

• ECMWF-based RadiationECMWF-based Radiation

• ORCHIDEE land surface modelORCHIDEE land surface model

Interactive phenologyInteractive phenology

Dynamic vegetationDynamic vegetation

River routingRiver routing

The system can be run in four different modes: The system can be run in four different modes: 1.1. atmosphereatmosphere2.2. ocean with climatological atmospheric forcingocean with climatological atmospheric forcing3.3. ocean with ARCM forcing, and ocean with ARCM forcing, and 4.4. atmosphere-ocean full coupledatmosphere-ocean full coupled

MOSLEF (MODE 2) WINTER VELOCITY

MOSLEF (MODE 3) WINTER VELOCITY

PRELIMINARY RESULTS

Several preliminary simulations have been run in order to test the proper working of the system.

Here some results of two simulations of the ocean model MOSLEF in the mode 2 of the system (atmospheric forcing provided by climatology) and the mode 3 (atmospheric forcing provided by PROMES, but MOSLEF running offline) are shown

In the pictures a correct performance of MOSLEF can be seen. Both in summer and winter the model results have a reasonably good approximation to the main characterictics of the Mediterranean Sea surface circulation (see Roussenov et al., 1997 and its references).

Mode 2 and mode 3 of the system give lightly different results, mainly in the strength of some vortex. This is an expected result because of the larger variability of the ARCM atmospheric forcings.

REFERENCES ACKNOWLEDGMENTSRoussenov, V., E. Stanev, V. Artale and N. Pinardi (1995) A seasonal model of the Mediterranean Sea general circulation. J. Geophys. Res., 100 (C7): 13515 -13538.

Dorado, E. (2009) Estudio de soluciones numéricas de largo plazo de los modelos de ecuaciones primitivas de la circulación general del océano. PhD thesis, Universidad Complutense de Madrid.

Castro M, Fernandez C, Gaertner MA (1993) Description of a meso-scale atmospheric numerical model. In: Diaz JI, Lions JL (eds) Mathematics, climate and environment, Masson (ISBN: 2-225-84297-3), p273.

Valcke, S. (2006) OASIS3 User Guide (oasis3_prism_2-5) PRISM Support Initiative Report No 3. CERFACS, Toulouse, France. 64 pp.

This work has been funded through the Spanish projects CGL2007-66440-C04-01 and CGL2007-66440-C04-02 of the Education and Science Ministry of Spain