eastern pacific surface fluxes observed and simulated by coupled gcms
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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.
surface heat budget
0 = –∂/∂t SSTturbulent evaporation and sensible fluxnet radiationocean residual
annual average heat budget
+ +
= 0
“observed” coupled GCM simulations
Ocean residual flux
Colbo and Weller 2007
surface ocean heat budgetOctober
ship-observedheat fluxes20°S, October
surface heat budgetΔS > 40 W m-2
obs.
surface heat budget errors
obs.
solar longwave
surface downwelling radiationW
m-2
longitude
clear
full
S0: Iqbal 1988 R0: Hare 2005
solarlongwave
surface downwelling radiationW
m-2
longitude
solar transmission
clear
cloudyfull
longwave cloud effect
10 minuteaverages
Cloud forcing phase diagrampolarcold dry columnlow sun
tropicalwarm moistcolumn,high sun
Cloud forcing phase diagram
2(R–R
0) >
|S–S
0| +
10
W m
-2
Daily average cloud radiative forcing
xx: solar-weighted cloud fractionred: 2(R–R0) > |S–S0| + 10 W m-2
longwave
solar
models
ship
buoy
ISCCP
model surface cloud forcing
Does insolation explain SST?
no
surface heat budget0 =
–∂/∂t SSTturbulent evaporation and sensible fluxnet radiationocean residual =
Ekman transportgeostrophic transportupwellingeddy flux divergence
damp SST
the end
?