Evidence that ice forms primarily in supercooled liquid clouds at temperatures > -27°C

Details Evidence that ice forms primarily in supercooled liquid clouds at temperatures > -27°C Evidence that ice forms primarily in supercooled liquid clouds at temperatures > -27°C

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3814808w&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 14, CiteID L14808

Physics

1

Atmospheric Composition And Structure: Cloud Physics And Chemistry

Scientific paper

Using 4 years of radar and lidar observations of layer clouds from the Chilbolton Observatory in the UK, we show that almost all (95%) ice particles formed at temperatures >-20°C appear to originate from supercooled liquid clouds. At colder temperatures, there is a monotonic decline in the fraction of liquid-topped ice clouds: 50% at -27°C, falling to zero at -37°C (where homogeneous freezing of water droplets occurs). This strongly suggests that deposition nucleation plays a relatively minor role in the initiation of ice in mid-level clouds. It also means that the initial growth of the ice particles occurs predominantly within a liquid cloud, a situation which promotes rapid production of precipitation via the Bergeron-Findeison mechanism.

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