dr. piotr j. flatau pcirrus@gmail
DESCRIPTION
SIO209 Cloud Climate Feedbacks. Scripps Institution of Oceanography University of California. Dr. Piotr J. Flatau [email protected]. SIO209 Clouds. SIO209 Clouds. SIO209 Clouds. SIO209 Cloud Climate Feedbacks. Radiative Convective Equilibrium Feedbacks Cloud Physics Feedbacks - PowerPoint PPT PresentationTRANSCRIPT
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Dr. Piotr J. Flatau
Scripps Institution of Oceanography
University of California
SIO209
Cloud Climate Feedbacks
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SIO209
Clouds
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SIO209
Clouds
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SIO209
Clouds
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SIO209
Cloud Climate Feedbacks
• Radiative Convective Equilibrium Feedbacks
• Cloud Physics Feedbacks
• Cloud Formation Feedbacks
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SIO209
Cloud Climate Feedbacks
• Radiative Convective Equilibrium Feedbacks
• Cloud Physics Feedbacks
• Cloud Formation Feedbacks
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SIO209
Radiative Convective Equilibrium - Examples
Clear sky energy balance (IR cooling)
Mid morning max. precipitation in tropics
Observed temperature differences between fall and spring Stratocumulus balance (subsidence, heat flux, IR cooling)
Convection control of SST in the tropics
Lapse rate stabilization or destabilization
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SIO209
Radiative Convective Equilibrium – IR cooling
-100 W/m2 IR cooling RCE
(“W. M. Gray”)
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Radiative Convective Equilibrium - Definition
To first order, the atmosphereexists in a state of quasi balance between
radiativecooling and the convective processes that give
riseto latent and sensible heating.
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SIO209
Radiative Convective Equilibrium - 1K/day
Radiative cooling - clear sky
dT/dt = - F/(cp rho Dz) =-100/(1004 *1.2* 8000) [K/s]= -100/(1000 * 8000) *(60*24*60)=36*24 10^4/ 8*10^6=36*24/(800)=36*4/100 =about=
1.0K/day
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RCE - Up Moist Down Dry
Evaporation
Q=mL= 1g * 2.5 * 10^3J/gF=2.5* 10^3/(24*60*60)= 1/36 W/cm2=1000/3.6 W/m2=250W/m2
L=2.5*10^6 J/kg1W=1J/s
0.3cm evaporation per day to offsets 100W/m2 of IR cooling
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SIO209
RCE Example: Precipitation in Tropics
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SIO209
Early Morning Precip Max in Tropics - RCE
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Mapes, 2002
Hartmann & Larson, 2002
Implications for deep convection
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Stratocumulus RCE
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SIO209
Lilly’s Model of Sc. RCE
dT/dt=-4 K/day (IR)Subsidence (30mb/d-100W/m2)Heat flux
d T /dt = - (Fnet,base-Fnet,top)/ (cp rho dz)
Fnet,top=75W/m2Fnet,base=15W/m2
Cp=1004 J kg^-1 K^-1Rho=1.2 kg m^-3Dz=1km
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SIO209
Radiative Convective Equilibrium – SST Control
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SIO209
Radiative Convective Equilibrium – SST Control
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Radiative Convective Equilibrium – Thermostat
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Radiative Convective Equilibrium Adjustment
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Radiative Convective Equilibrium – Summary