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EUROCS FIRE-I strato cumulus diurnal cycle intercomparison.

Aug. 2002, Madrid, Spain.

Based on observations made in stratocumulus off the coast of California during FIRE I.

Landsat satellite image (horizontal area about 200 × 400km2) showing stratocumulus off the coast of California for 14 July 1987. The cloud tops are at about 500 ∼ 1000 m whereas the convective cells have a horizontal dimension of about 10 km. The stratocumulus case studied in this paper is based on observations performed during FIRE I in the cloud deck shown.

Observational work published in Hignett 1991

LES and SCM setup described in Duynkerke et al., 2004

Characteristics:

  • over ocean

  • distinct diurnal variation in the cloud liquid-water path and the turbulence profiles

  • decoupled boundary layer during daytime

  • vertically well-mixed boundary layer during the night