Supercooled drizzle formed by condensation–coalescence in the mid-winter season of the Canadian Arctic
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چکیده
Ž . Ž X Supercooled drizzle freezing drizzle was observed at Inuvik, N.W.T., Canada 68822 N, X . 133842 W on December 20, 21 and 27, 1995. Meteorological conditions in which the supercooled Ž . drizzle could form under low temperatures colder than y208C in the mid-winter season of the Canadian Arctic were examined from the sounding data and data measured by a passive Ž . microwave radiometer at ground level. The following results were obtained. 1 Supercooled Ž . drizzle fell to the ground with ice pellets and frozen drops on snow crystals. 2 The maximum size of supercooled drizzle particles increased as the depth of cloud layer saturated with respect to Ž . water increased. 3 Because a layer of air temperature higher than 08C was not detected from the sounding data at Inuvik, melting of snow particles was impossible. It was concluded, therefore, that supercooled drizzle was formed by the condensation–coalescence process below freezing temperature. q 2000 Published by Elsevier Science B.V. All rights reserved.
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