Indian Ocean SST switch-on experiments. Switch-on experiment.

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Presentation transcript:

Indian Ocean SST switch-on experiments

Switch-on experiment

R K 3m/sec 10m/sec

Switch-on experiment d1 d5 d8d15 Temporal adjustment of temperature

T (K) q (g/Kg) P (mm/day) Switch-on experiment q.vq.v ==> T ==> , T

T (K) q (g/Kg) P (mm/day) Switch-on experiment

Diabatic heating profile in equilibrium state

Switch-on experiment (vq)’ vq’ v’q prc Shading in upper left panel is the vertically integrated moisture

conv stratus lw rad Switch-on experiment d1 d5 d8d15 Adjustment of temperature Vertical heating profile v_dif SUM Kelvin K/sec

q’ 0 Indian ocean Africa Wave Dynamics T’>0 Intensified convection M less CAPE reduced Convection

Response to CO 2 forcing with fixed SST At least in the GFDL model, there is comptet

Response to CO 2 forcing with fixed SST At least in the AM2, there is a tug war between the direct radiative effect of CO2 and the surface SST warming. In AM2, SST wins; in CAM3, CO2 wins. But in both model, the response to 2xCO2 seems to be robust.

Simulated summer (Jul-Aug-Sept) Sahel rainfall by NCAR CCSM3.0 (upper) and GFDL CM2 coupled climate models driven by the estimated observation of solar, greenhouse gas, aerosol and land use forcing ( ) plus A1B future scenario forcing ( ).

2xCO2 +2K Annual mean response to 2xCO2 and 2K uniform SST warming

ANN ANN response to 2xCO2 forcing, but fixed SST