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Developments in CCSM: Ocean and Sea-Ice Forcing, Mixing Parameterizations, and Coupled Impact Reviews

This document reviews the advancements in the Community Climate System Model (CCSM) from version 3.0 to 3.5, detailing developments in ocean and sea-ice forcing, and the integration of biological components with an emphasis on phytoplankton. Key updates include increased vertical levels, reduced lateral viscosity, and advancements in tidal mixing parameterizations. Ongoing research focuses on optimizing models for more accurate atmospheric and oceanic interactions, reflecting on the influence of diurnal cycles and improving coastal ecosystem representation. The path to CCSM4 and future developments are discussed.

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Developments in CCSM: Ocean and Sea-Ice Forcing, Mixing Parameterizations, and Coupled Impact Reviews

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  1. November 2007, CCSM SSC Ocean Model Developments • Ocean, Sea-Ice Forcing ===>> fluxes • Review CCSM3 to 3.5 • Coupled examples from 3.5 to present • Ongoing to CCSM4 and beyond

  2. HEAT 2.4 PW (3.3) 20% to south (40%) WATER

  3. Review CCSM3 to CCSM3.5 • Ocean BGC (phytoplankton emphasis) • Extension of GM eddy parameterization to mixed-layers with a strong depth dependency • Increase vertical levels from 40 to 60 • Greatly reduced lateral viscosity

  4. FV2x1 Low Viscosity Higher Viscosity

  5. ANN aice NH

  6. CCSM3.5 to present (coupled) • Extend observationally based tidal mixing to shallow seas (e.g. Banda Sea) • Latitudinal dependent internal wave mixing in the ocean interior (1/10 tropics and Arctic), (x10 20-30º ) COUPLED IMPACTS

  7. Tropical rainfall biases in T42x1. Difference in rainfall between high mixing and control.

  8. Ongoing to CCSM4 and beyond • Decisions will depend on CAM PBL closure !!! • Optimizing 60 levels.  • Parameterization of sub-mesoscale re-stratification.  • Consistent PBL (atm, ocn) and flux (air-sea, air-ice, air-land) stability functions.  • Diurnal cycle of SST. (prototyped) • Parameterized deep overflows. (generalizing) • Nested regional models (coasts, ITF). (coding) • Coastal ecosystems at higher trophic levels. (planning)

  9. ZONAL WIND STRESS CCSM3.5 (26) UW (30)

  10. ZONAL WIND STRESS CCSM3.5 (26) CCSM3.5 (31)

  11. Observed CCSM3.5 (26)

  12. Observed UWpbl (30) CCSM UW (30)

  13. Observed CCSM3.5 (31)

  14. Parameterized Overflows Denmark Strait Faroe-Bank Channel Multiple Entrainments + Path Latitude Domain for the regional simulations of FBC overflow (Riemenschneider) from J.Price

  15. Ideal Age (181-200) DSO Young DSO water goes deeper to 4000m DSO - CON

  16. Temperatureat 2000m CON-OBS DSO alone removes much of the North Atlantic bias from the Labrador Sea to the South Atlantic DSO-CON

  17. Temperatureat 500m CON-OBS DSO alone removes most North Atlantic bias between 30 and 75° N . DSO-CON

  18. THE END

  19. SST colors Interior Diffusivity SLP contours No change to Ocean PBL SST bias

  20. Temperatureat 3000m CON-OBS DSO alone reduces North Atlantic biases DSO-CON

  21. MOC DSO Both deep downstream and shallow upstream responses Atlantic Global Global Atlantic DSO-CON

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