clivar 11 th -12 th -13 th february 2009. a 44 years ocean circulation hindcast using a 3d model:...
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CLIVAR 11th-12th-13th February 2009
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A 44 years ocean circulation hindcast using a 3D model:
steric effect in sea level variability
M.I. Ferrer, M.G. Sotillo, E. Álvarez-Fanjul, D. Gomis, P. Oddo, J.M. Baldasano.
CLIVAR 11th-12th-13th February 2009
Index
VANIMEDAT Project & Objectives Oceanic Model: NEMO Hindcast configuration Validation Conclusions
CLIVAR 11th-12th-13th February 2009
Project & Objectives
VANIMEDAT project (funded by Ministerio de Educación y Ciencia) Sea level decadal and interdecadal variability in the Mediterranean Sea.
o Direct determination of the steric component from a baroclinic model forced by HIPOCAS air-sea fluxes.
o Run 44 years (1958-2001) NEMO model using HIPOCAS atmospheric forcing.
Data base used to study variability in the Mediterranean Sea and Iberian Atlantic Waters
CLIVAR 11th-12th-13th February 2009
Model: NEMO
NEMO (Nucleus for European Modelling of the Ocean) is a state-of-the-art modelling framework for oceanographic research, operational oceanography seasonal forecast and climate studies.
o Ocean dynamics: NEMO-OPA
Evolution and reliability of NEMO are organised by a European Consortium between
o CNRS (Centre National de la recherque scientifique)o Mercator-Oceano UKMO (Met Office)o NERC (Natural Environment Research Council)
Website: www.nemo-ocean.eu
CLIVAR 11th-12th-13th February 2009
Hindcast configuration
Model domain Horizontal res. 1/8º Vertical res. 72 levels 14ºW-36.25ºE 30.25ºN-46ºN
Initial conditions: T/S ORCA model (resolution 1/4º)
Global ocean-ice model for a long simulation (1958-2004)
Initial salinityInitial temperature
Bathymetry (m)
Initial salinity Initial temperatureInitial temperatureInitial temperature
CLIVAR 11th-12th-13th February 2009
Hindcast configuration
Forcing:o Atmospheric forcing with bulk formula: HIPOCAS data
base time resolution: hourly spatial resolution ~0.5º
o Relaxation to surface ORCA salinity time resolution: monthly files spatial resolution 1/4º
o Atlantic damping to salinity and temperature (ORCA) in a buffer zone
CLIVAR 11th-12th-13th February 2009
Hindcast configuration
Forcing:o Atmospheric forcing with bulk formula: HIPOCAS data
base time resolution: hourly spatial resolution ~0.5º
o Relaxation to surface ORCA salinity time resolution: monthly files spatial resolution 1/4º
o Atlantic damping to salinity and temperature (ORCA) in a buffer zone
CLIVAR 11th-12th-13th February 2009
Hindcast configuration
Initial configuration (bathymetry, rivers) from INGV (Instituto Nazionale di Geofisica e Vulcanologia, Bologna)
Bulk formulation from INGV Linear free surface filtered formulation MPI parallel mode
The 44-years hindcast is running at Marenostrum supercomputer located in Barcelona Supercomputing Center (BSC)
CLIVAR 11th-12th-13th February 2009
Validation
Validation first period January 1991 to November 2001o Time series of surface salinity, temperature.
o RMSE
Data sets:o AVHRR SST
o Medatlas Climatology
o ORCA model
CLIVAR 11th-12th-13th February 2009
Surface Temperature Monthly Mean
Satellite (green)
NEMO (black)
ORCA (blue)
CLIVAR 11th-12th-13th February 2009
Surface Temperature differences
NEMO-Sat
(black)
ORCA-Sat
(blue)
CLIVAR 11th-12th-13th February 2009
Surface Salinity Monthly Mean
Medatlas (red)
NEMO (black)
ORCA (blue)
CLIVAR 11th-12th-13th February 2009
RMSE Medatlas Salinity
CLIVAR 11th-12th-13th February 2009
Conclusions
An ocean reanalysis tool based on a 3D baroclinic model forced by hourly HIPOCAS data has been developed.
Extensive validation for the period 1991-2001 show good agreement with data.
The generated data will be useful to study ocean climate variability, upgrading the HIPOCAS database.
The model application is a powerful tool to generate future scenarios.