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Clouds and radiation in a LSM L=50km. Veldhoven, 2009. 2 Stratocumulus cloud albedo: example cloud layer depth = 400 m effective cloud droplet.

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Presentation on theme: "Clouds and radiation in a LSM L=50km. Veldhoven, 2009. 2 Stratocumulus cloud albedo: example cloud layer depth = 400 m effective cloud droplet."— Presentation transcript:

1 Clouds and radiation in a LSM L=50km

2 Veldhoven, Stratocumulus cloud albedo: example cloud layer depth = 400 m effective cloud droplet radius= 10 m optical depth = 25 homogeneous stratocumulus cloud layer

3 Veldhoven, Real clouds are inhomogeneous Stratocumulus albedo from satellite

4 Veldhoven, Albedo for an inhomogeneous cloud layer Redistribute liquid water: optical depths = 5 and 45 inhomogeneous stratocumulus cloud layer mean albedo = 0.65 < 0.79

5 Veldhoven, Decrease optical thickness: Cahalan et al (1994): = 0.7 (FIRE I observations) 5 Cloud albedo in a weather forecast or climate model effective mean inhomogeneous albedo homogeneous albedo

6 Factor depends on the optical depth variance ( )

7 Analytical results for the inhomogeneity factor Assumption: Gaussian optical depth distribution not smaller than ~ 0.8 isolines

8 Environmental Physics 8 Scattering and absorption absorption cross section a : effective area of the molecule for removing energy from the incident beam shortwave longwave scattering cross section sca absorption cross section a


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