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Coupled Ocean-Atmosphere model for Regional Climate studies in the Mediterranean Sea

This project aims to regionalize climate change projections for the Iberian Peninsula using a coupled ocean-atmosphere model. The model combines the REMO atmospheric component and the ROMS ocean component, with the OASIS3 coupler. Advantages of nested climate models include consistent high-resolution simulations and reduced grid size effects. The model setup considers the present time climate and climate change projections, with a focus on the Mediterranean Sea. Validation and future work include coupling experiments, spin-up simulations, and downscaling of data.

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Coupled Ocean-Atmosphere model for Regional Climate studies in the Mediterranean Sea

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  1. Coupled Ocean-Atmosphere model for Regional Climate studies in the Mediterranean Sea William Cabos Departamento de Física Universidad de Alcalá European ROMS Workshop 6-8 November

  2. Coupling of REMO to ROMS The aim of our project Regionalization of Climate change projections of IPCC 4th AR models for the Iberian Peninsula Tool Regional coupled Ocean–Atmosphere Model Atmospheric component REMO (Regional Model) Ocean component ROMS (Regional Ocean Model System) Coupler OASIS3 coupler Each of these components has been successfully used for a wide range of climate studies.

  3. Advantages of nested climate models Global model Regional simulations of high resolution consistent with global circulation when resources are limited avoid inconsistences between global and regional models reduce the effects of grid size changes from global to region of interest Intermediate nested model Region of interest

  4. Model domain: Atlantic Ocean, Mediterranean and Black Sea Mediterranean circulation is poorly simulated in global models Model Setup

  5. Conditions to take into account in the model It should simulate the Mediterranean present time climate and climate change projections The Atlantic ocean is necessary for the global climate signal The ocean and the atmosphere should have the same grid: no interpolation 1 hour exchange frecuency The masks should be as like as possible The Black Sea should be included Model Setup

  6. Atmosphere REMO Coupler OASIS COUPLED MODEL Ocean ROMS

  7. REMO (REgional MOdel) Atmospheric General Circulation Climate Model. developed in the Max Planck institute of Metereology Hidrostatic - maximal grid resolution: 1/10 degree. This grid resolution enables the model to resolve the most important topographic features Sofisticated vegetation scheme State of the art soil, hydrographic and glaciar models Widely used for climatic and impact studies in Europe Echam4 physics Rotated coordinates

  8. REMO and CRU temperature: South Spain REMO Validation : Temperature REMO and CRU temperature differences Different regions

  9. All Spain REMO Validation : Precipitation Central Spain North Spain

  10. REMO coupled model domain

  11. REMO coupled model setup

  12. Flexible, modular, well supported Sinchronization of component models Coupling fields exchange: arbitrary number, frecuency I/O actions Interpolation PSMILe communication: MPI, direct communication between models with the same grid and partition. OASIS

  13. Roms-Agrif version 0.22 degrees resolution 30 leves, qs=6.0 qb=0. Open boundaries: restoring to global coupled model data Rotated coordinates: Topography and ocean forcing fields are rotated with Eulerian angles, f calculated in geogrphical coordinates GDEM3 initial conditions Spinup with REMO 1958-2001 climatology : winds, heat and fresh water fluxes ROMS

  14. ROMS

  15. REMO wind stress: February ROMS: spinup forcing REMO wind stress: July

  16. REMO Heat Flux: February ROMS: spinup forcing REMO Heat Flux: July

  17. ROMS without nudging

  18. ROMS Black Sea with nudging (.11 degrees)

  19. ROMS .22 with nudging

  20. ROMS .22 with nudging

  21. Future work Finish the coupling interface Fix the bosphorous problem Use 6-hour REMO data for spinup Include tides Validate ROMS -experiments with the coupled model

  22. REMO

  23. REMO

  24. Nested models A hierarchy of nested models with growing resolution allows: Regional simulations of high resolution consistent with global circulation when resources are limited To avoid inconsistences between the global model and the regional model in the region of interest To reduce the impact of grid size difference Global model Intermediate nested model Region of interest

  25. Well structured routines, allows model exchange OASIS

  26. REMO

  27. REMO

  28. REMO

  29. REMO

  30. REMO

  31. ROMS: downscaling of SODA data

  32. REMO

  33. Regional Studies: Climate change and present climate validation: Present climate: 1958 - 2001 Climate change: different scenarios:2000 - 2100 Global data: IPCC 4th AR ocean-atmosphere models Regional models: Ocean – ROMS; forced with global and regional atmosphere Atmosphere – REMO Coupling necessary for local effects Activities of our group related to ROMS

  34. REMO

  35. SODA Ocean reanalysis: conbines observations with ocean data from 1958 to present .5 degree resolution Does not show the most important features of Mediterranean circulation : resolution ? ROMS .12 degrees simulation with SODA boundary data Can be used for higher resolution local climate studies Weak nudging to SODA data? ROMS: downscaling of SODA data

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