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Cloudiness and Marine Boundary Layer Dynamics
in the ASTEX Lagrangian Experiments. Part II: Cloudiness,
Drizzle, Surface Fluxes and Entrainment
Christopher S. Bretherton, Philip H. Austin, and Steven T. Siems
Journal of the Atmospheric Sciences, 15 August 1995
Volume 52, No. 16, pages 2723-2735.
Abstract
We continue the analysis of the ASTEX Lagrangians started in Part I,
presenting measurements of sea-surface temperature, surface latent and
sensible heat fluxes from bulk aerodynamic formulas, cloud fraction
and drizzle rate for the two Lagrangians, mainly using data from
horizontal legs flown by the Electra and C130. Substantial drizzle,
averaging 1 mm day-1 at the surface, was measured during the first
Lagrangian. The surface fluxes increased rapidly as the airmass
advected over rapidly increasing SST. Cloud fraction remained high
throughout. During the second Lagrangian, drizzle formed in the
stratocumulus layer but mainly evaporated in the deep dry cumulus
layer and the subcloud layer before reaching the
surface. Stratocumulus cloud cover was thickest when moist air lay
above the inversion, then dissipated to leave only cumuli once dry air
advected over the inversion.
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