In this paper, aircraft measurements are presented of liquid phase(ice-free) wave clouds made at temperatures greater than ?5°Cthat formed over Scotland, UK. The horizontal variationsof the vertical velocity across wave clouds display a distinct pattern.The maximum updraughts occur at the upshear flanks of the clouds andthe strong downdraughts at the downshear flanks. The cloud dropletconcentrations were a couple of hundreds per cubic centimetres,and the drops generally had a mean diameter between 15–45 μm.A small proportion of the drops were drizzle. The measurements presented here and in previous recent studies suggest a different interactionof dynamics and microphysics in wave clouds from the accepted model.The results in this paper provide a case for future numericalsimulation of wave cloud and the interaction between wave and cloud.
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