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The mechanism of ice splinter production during riming
Author(s) -
Mossop S. C.
Publication year - 1980
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl007i002p00167
Subject(s) - drop (telecommunication) , clear ice , materials science , ice crystals , supercooling , cloud chamber , ice formation , cracking , mechanics , atmospheric sciences , geology , meteorology , sea ice , composite material , physics , arctic ice pack , antarctic sea ice , telecommunications , computer science , nuclear physics
When an ice particle grows at about −5°C by sweeping up supercooled water drops in a cloud having a wide range of drop sizes, secondary ice particles are ejected as the drops freeze. In this way the concentration of ice particles in the cloud may increase rapidly. Present experiments show that this "splinter" formation can be considerably reduced by injecting small quantities of ammonia into the cloud. This supports the theory that splintering is a consequence of the formation of a strong ice shell round the periphery of a freezing drop. As the drop freezes the pressure within the shell increases until it is relieved by cracking of the shell. In extreme cases fragments of ice may be ejected. The addition of ammonia is thought to weaken the ice structure, thus allowing pressure to be relieved by deformation or cracking without ejection of splinters. This interpretation is supported by experiments on the freezing of larger drops "doped" with NH 3 or HCℓ.