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Theory of Time-Dependent Freezing. Part I: Description of Scheme for Wet Growth of Hail

Phillips, Vaughan LU ; Khain, Alexander; Benmoshe, Nir and Ilotoviz, Eyal (2014) In Journal of Atmospheric Sciences 71(12). p.133-163
Abstract
At subzero temperatures, cloud particles can contain both ice and liquid water fractions. Wet growth of precipitation particles occurs when supercooled cloud liquid is accreted faster than it can freeze on impact. With a flexible framework, the theory of wet growth of hail is extended to the case of the inhomogeneities of surface temperature and of liquid coverage over the surface of the particle. The theory treats the heat fluxes between its wet and dry parts and radial heat fluxes from the sponge layer through the liquid skin to the air. The theory parameterizes effects of nonsphericity of hail particles on their growth by accretion. Gradual internal freezing of any liquid soaking the hail or graupel particle's interior during dry growth... (More)
At subzero temperatures, cloud particles can contain both ice and liquid water fractions. Wet growth of precipitation particles occurs when supercooled cloud liquid is accreted faster than it can freeze on impact. With a flexible framework, the theory of wet growth of hail is extended to the case of the inhomogeneities of surface temperature and of liquid coverage over the surface of the particle. The theory treats the heat fluxes between its wet and dry parts and radial heat fluxes from the sponge layer through the liquid skin to the air. The theory parameterizes effects of nonsphericity of hail particles on their growth by accretion. Gradual internal freezing of any liquid soaking the hail or graupel particle's interior during dry growth ("riming") is treated as well. In this way, the microphysical recycling envisaged by Pflaum in a paper in 1980 is treated, with alternating episodes of wet and dry growth. The present paper, the first of a two-part paper, describes the scheme to treat wet growth, accounting for dependencies on condensate content, temperature, and particle size. Comparison with the laboratory experiments is presented. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Atmospheric Sciences
volume
71
issue
12
pages
133 - 163
publisher
Amer Meteorological Soc
external identifiers
  • wos:000345886100009
  • scopus:84916230081
ISSN
1520-0469
DOI
10.1175/JAS-D-13-0375.1
project
MERGE
language
English
LU publication?
yes
id
e278a952-8e55-4d58-89d5-e07d863702e8 (old id 4957580)
date added to LUP
2015-01-28 16:03:28
date last changed
2017-09-24 03:05:59
@article{e278a952-8e55-4d58-89d5-e07d863702e8,
  abstract     = {At subzero temperatures, cloud particles can contain both ice and liquid water fractions. Wet growth of precipitation particles occurs when supercooled cloud liquid is accreted faster than it can freeze on impact. With a flexible framework, the theory of wet growth of hail is extended to the case of the inhomogeneities of surface temperature and of liquid coverage over the surface of the particle. The theory treats the heat fluxes between its wet and dry parts and radial heat fluxes from the sponge layer through the liquid skin to the air. The theory parameterizes effects of nonsphericity of hail particles on their growth by accretion. Gradual internal freezing of any liquid soaking the hail or graupel particle's interior during dry growth ("riming") is treated as well. In this way, the microphysical recycling envisaged by Pflaum in a paper in 1980 is treated, with alternating episodes of wet and dry growth. The present paper, the first of a two-part paper, describes the scheme to treat wet growth, accounting for dependencies on condensate content, temperature, and particle size. Comparison with the laboratory experiments is presented.},
  author       = {Phillips, Vaughan and Khain, Alexander and Benmoshe, Nir and Ilotoviz, Eyal},
  issn         = {1520-0469},
  language     = {eng},
  number       = {12},
  pages        = {133--163},
  publisher    = {Amer Meteorological Soc},
  series       = {Journal of Atmospheric Sciences},
  title        = {Theory of Time-Dependent Freezing. Part I: Description of Scheme for Wet Growth of Hail},
  url          = {http://dx.doi.org/10.1175/JAS-D-13-0375.1},
  volume       = {71},
  year         = {2014},
}