Supercooled drizzle formed by condensation–coalescence in the mid-winter season of the Canadian Arctic |
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Authors: | Masahiro Kajikawa Katsuhiro Kikuchi Yoshio Asuma Yusuke Inoue Noboru Sato |
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Institution: | a Department of Civil and Environmental Engineering, Faculty of Engineering and Resource Science, Akita University, Akita 010-8502, Japan;b Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan;c Science Education Institute of Osaka Prefecture, Osaka 558-0011, Japan |
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Abstract: | Supercooled drizzle (freezing drizzle) was observed at Inuvik, N.W.T., Canada (68°22′N, 133°42′W) on December 20, 21 and 27, 1995. Meteorological conditions in which the supercooled drizzle could form under low temperatures (colder than −20°C) in the mid-winter season of the Canadian Arctic were examined from the sounding data and data measured by a passive microwave radiometer at ground level. The following results were obtained. (1) Supercooled 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 water increased. (3) Because a layer of air temperature higher than 0°C 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. |
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Keywords: | Supercooled drizzle Freezing drizzle Condensation– coalescence process The Arctic region |
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