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Clouds and radiation in a LSM

L=50km. Clouds and radiation in a LSM. Stratocumulus cloud albedo: example. homogeneous stratocumulus cloud layer. cloud layer depth = 400 m effective cloud droplet radius = 10 m m optical depth t = 25. Real clouds are inhomogeneous. Stratocumulus albedo from satellite.

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Clouds and radiation in a LSM

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  1. L=50km Clouds and radiation in a LSM

  2. Stratocumulus cloud albedo: example homogeneous stratocumulus cloud layer cloud layer depth = 400 m effective cloud droplet radius = 10 mm optical depth t = 25

  3. Real clouds are inhomogeneous Stratocumulus albedo from satellite

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

  5. Cloud albedo in a weather forecast or climate model inhomogeneous albedo homogeneous albedo Decrease optical thickness: Cahalan et al (1994): c = 0.7 (FIRE I observations) teffective tmean

  6. Factor c depends on the optical depth variance (st)

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

  8. shortwave longwave Scattering and absorption scattering cross section ssca absorption cross section sa: effective area of the molecule for removing energy from the incident beam absorption cross section sa

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