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Eastern Pacific surface fluxes observed and simulated by coupled GCMs

Eastern Pacific surface fluxes observed and simulated by coupled GCMs. Simon de Szoeke & Chris Fairall. de Szoeke et al. 2010: Surface Flux Observations on the Southeastern Tropical Pacific Ocean and Attribution of SST Errors in Coupled Ocean–Atmosphere Models, J. Climate. surface heat budget.

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Eastern Pacific surface fluxes observed and simulated by coupled GCMs

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  1. Eastern Pacific surface fluxes observedand simulated by coupled GCMs Simon de Szoeke & Chris Fairall de Szoeke et al. 2010: Surface Flux Observations on the Southeastern Tropical Pacific Ocean and Attribution of SST Errors in Coupled Ocean–Atmosphere Models, J. Climate.

  2. surface heat budget 0 = –∂/∂tSST turbulent evaporation and sensible flux net radiation ocean residual

  3. annual average heat budget + + = 0

  4. Ocean residual flux “observed” coupled GCM simulations

  5. surface ocean heat budget October Colbo and Weller 2007

  6. ship-observedheat fluxes 20°S, October

  7. surface heat budget ΔS > 40 W m-2 obs.

  8. surface heat budget errors obs.

  9. surface downwelling radiation solar longwave clear W m-2 full longitude S0:Iqbal 1988 R0: Hare 2005

  10. surface downwelling radiation longwave solar W m-2 longitude

  11. solar transmission clear full cloudy

  12. longwave cloud effect 10 minute averages

  13. Cloud forcing phase diagram polar cold dry column low sun  tropical warm moistcolumn, high sun 

  14. Cloud forcing phase diagram 2(R–R0) > |S–S0| + 10 W m-2

  15. Daily average cloud radiative forcing longwave solar xx: solar-weighted cloud fraction red: 2(R–R0) > |S–S0| + 10 W m-2

  16. model surface cloud forcing models buoy ship ISCCP

  17. Does insolation explain SST? no

  18. surface heat budget 0 = –∂/∂tSST turbulent evaporation and sensible flux net radiation ocean residual = Ekman transport geostrophic transport upwelling eddy flux divergence damp SST

  19. the end ?

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