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Atmospheric and Ocean Models and Their Coupling

Atmospheric and Ocean Models and Their Coupling. Xiouhua Fu International Pacific Research Center (IPRC) University of Hawaii. OUTLINE.  Atmospheric GCM  Intermediate Ocean Model  Atmosphere-Ocean Coupling.

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Atmospheric and Ocean Models and Their Coupling

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  1. Atmospheric and Ocean Models and Their Coupling Xiouhua Fu International Pacific Research Center (IPRC) University of Hawaii

  2. OUTLINE  Atmospheric GCM Intermediate Ocean Model Atmosphere-Ocean Coupling

  3. ECMWF Model at HAMburg (ECHAM) Online description of ECHAM family models: http://www.mpimet.mpg.de/en/wissenschaft/modelle/echam.html

  4. ECHAM-4 AGCM

  5. Intermediate Ocean Model 1, Governing Equations 2, Performance

  6. References for UH 2.5-layer ocean model Wang, B., T. LI, and P. Chang, 1995: An Intermediate Model of the Tropical Pacific Ocean. J. Phys. Oceanogr., 25, 1599-1616. http://www.soest.hawaii.edu/users/bwang/ Fu X. and B. Wang, 2001: A coupled modeling study of the annual cycle of the Pacific cold tongue. Part I: Simulation and sensitivity experiments. J. Climate, 14 , 765-779 http://iprc.soest.hawaii.edu/~xfu/study1/FW1.pdf

  7. Wang-Li-Fu Intermediate Ocean Model (Wang, Li, and Chang 1995; Fu and Wang 2001)

  8. Governing equations for mixed-layer: (Wang, Li, and Chang 1995)

  9. Governing equations for upper-layer: (Wang, Li, and Chang 1995)

  10. Mixed-layer base turbulent entrainment: (Wang, Li, and Chang 1995)

  11. Ocean-Model Response to Observed Surface Forcing (surface winds, heat fluxes) (Wang, Li, and Chang 1995)

  12. Model Simulation Observations ML Thermocline Depth Levitus (1982) (Wang, Li, and Chang 1995)

  13. Simulated Interannual Variations Thermocline Depth SST (Wang, Li, and Chang 1995)

  14. ENSO Variability EOF1 EOF2 OBS EOF1 EOF2 Simulation (Wang, Li, and Chang 1995)

  15. (Fu and Wang 2001)

  16. (Fu and Wang 2001)

  17. (Fu and Wang 2001)

  18. (Fu and Wang 2001)

  19. (Fu and Wang 2001)

  20. Atmosphere-Ocean Coupling 1, Coupling Procedure 2, Sensitive Parameters 3, Code Structure

  21. Coupling Procedure Daily-mean surface winds, net surface heat flux, solar radiation Atmospheric model (30 mins) Daily-mean sea surface temperature (SST) Ocean model (2 hrs)

  22. Procedure to parameterize (T1 –Te ) as function of h: +  (To –T1 ) Relaxation term Get new (T1 – Te)

  23. New relationship between (T1 –Te ) and h: (T1 –Te ) a2 a1 h hmax hmin (T1 – Te ) = a1 + (a2 – a1) {(hmax – h)/(hmax – hmin)}2.5

  24. Code structure: MAIN PROGRAM: master.f90 Initialize atmospheric model; Initialize ocean model: oce_init {module/mo_couple.f90} control.f90 Drive.f90 Stepon.f90 scan1sl oce_run gpc.f90 cplsst Both subroutines of oce_init and oce_run can be found under ./modules/mo_couple.f90

  25. Code structure: Oce_init amask: get land-sea mask setupo: prepare parameters for ocean model and read in initial ocean conditions get initial SST for ocean model

  26. Code structure: Oce_run oce_collect: collect ocean forcing oce_collect: collect ocean forcing winda: interpolate surface forcing from atmospheric grid to ocean grid iom: core ocean model code getsst: interpolate SST from ocean grid to atmospheric grid

  27. Thanks

  28. UH Hybrid Coupled GCM • Atmospheric component: • ECHAM-4 T30L19 AGCM • (Roeckner et al. 1996) • Ocean component: • WLF 2-1/2-layer upper ocean model (0.5ox0.5o) • (Fu and Wang 2001) •  Wang, Li, and Chang (1995): upper-ocean thermodynamics • (2-1/2 ocean model) •  McCreary and Yu (1992): upper-ocean dynamics (2-1/2 ocean model) •  Jin (1997) : mean and ENSO (intermediate fully coupled model) •  Zebiak and Cane (1987): ENSO (intermediate anomaly coupled model) • Fully coupling without heat flux correction • Coupling region: Tropical Indian and Pacific Oceans (30oS-30oN) • Coupling interval: once per day

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