Microstructures of low and middle‐level clouds over the Beaufort Sea

Airborne measurements in low and middle‐level clouds over the Beaufort Sea in April 1992 and June 1995 show that these clouds often have low droplet concentrations (<100 cm3) and relatively large effective droplet radii. The highest average droplet concentrations overall were measured in altocumulus clouds that formed in airflows from the south that passed either over the North American continent or were from Asia. Droplet concentrations in low clouds tended to be higher in April than in June. The low clouds in June occasionally contained drops as large as 35 μm diameter; in these clouds the collision‐coalescence process was active and produced regions of extensive drizzle. Cloud‐top droplet concentrations were significantly correlated with aerosols beneath their bases, but appeared to be relatively unaffected by aerosols above their tops. Anthropogenic sources around Deadhorse, Alaska, increased local cloud droplet concentrations.

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