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The glaciation of a cumulus cloud over New Mexico

Phillips, Vaughan LU ; Blyth, AM; Brown, PRA; Choularton, TW and Latham, J (2001) In Quarterly Journal of the Royal Meteorological Society 127(575). p.1513-1534
Abstract
The Met Office Cloud Resolving Model (CRM) and the UMIST Explicit Microphysics Model (EMM) have been employed in the analysis of data from airborne studies of a multi-thermal cumulus cloud which developed over New Mexico in the summer of 1987. The principal goal was to establish a quantitative understanding of the observed development of glaciation of this cloud. The EMM was utilized in a series of tests designed to assess the sensitivity of cloud glaciation via the Hallett-Mossop (H-M) process to cloud parameters such as the concentration of cloud condensation nuclei, the cloud-base temperature, entrainment, and the freezing and splintering of supercooled raindrops. These tests with the EMM demonstrate that reductions in the mean droplet... (More)
The Met Office Cloud Resolving Model (CRM) and the UMIST Explicit Microphysics Model (EMM) have been employed in the analysis of data from airborne studies of a multi-thermal cumulus cloud which developed over New Mexico in the summer of 1987. The principal goal was to establish a quantitative understanding of the observed development of glaciation of this cloud. The EMM was utilized in a series of tests designed to assess the sensitivity of cloud glaciation via the Hallett-Mossop (H-M) process to cloud parameters such as the concentration of cloud condensation nuclei, the cloud-base temperature, entrainment, and the freezing and splintering of supercooled raindrops. These tests with the EMM demonstrate that reductions in the mean droplet diameter can inhibit the rates of H-M splinter production and auto-conversion, reducing the rate of accumulation of precipitation at the ground and reducing the concentration of ice particles. The warm-rain process in the EMM is fundamental to the production of graupel, H-M splinters and precipitation. Good agreement was found between the predictions of the CRM and the available dynamical and microphysical field observations. Analysis of results from both models indicated that the cloud glaciation is explicable in terms of the H-M process, with ice production being dominated by the freezing of supercooled raindrops in the H-M band, and the immediate and continuous production of ice splinters as supercooled droplets freeze onto them. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
cloud resolving model, Hallett-Mossop process, ice splinters, riming
in
Quarterly Journal of the Royal Meteorological Society
volume
127
issue
575
pages
1513 - 1534
publisher
Royal Meteorological Society
external identifiers
  • wos:000170391100002
  • scopus:0035390282
ISSN
0035-9009
DOI
10.1256/smsqj.57502
language
English
LU publication?
no
id
1075118f-b78f-4495-bdc1-337846a391eb (old id 4587617)
date added to LUP
2014-08-15 10:02:56
date last changed
2018-01-07 06:10:45
@article{1075118f-b78f-4495-bdc1-337846a391eb,
  abstract     = {The Met Office Cloud Resolving Model (CRM) and the UMIST Explicit Microphysics Model (EMM) have been employed in the analysis of data from airborne studies of a multi-thermal cumulus cloud which developed over New Mexico in the summer of 1987. The principal goal was to establish a quantitative understanding of the observed development of glaciation of this cloud. The EMM was utilized in a series of tests designed to assess the sensitivity of cloud glaciation via the Hallett-Mossop (H-M) process to cloud parameters such as the concentration of cloud condensation nuclei, the cloud-base temperature, entrainment, and the freezing and splintering of supercooled raindrops. These tests with the EMM demonstrate that reductions in the mean droplet diameter can inhibit the rates of H-M splinter production and auto-conversion, reducing the rate of accumulation of precipitation at the ground and reducing the concentration of ice particles. The warm-rain process in the EMM is fundamental to the production of graupel, H-M splinters and precipitation. Good agreement was found between the predictions of the CRM and the available dynamical and microphysical field observations. Analysis of results from both models indicated that the cloud glaciation is explicable in terms of the H-M process, with ice production being dominated by the freezing of supercooled raindrops in the H-M band, and the immediate and continuous production of ice splinters as supercooled droplets freeze onto them.},
  author       = {Phillips, Vaughan and Blyth, AM and Brown, PRA and Choularton, TW and Latham, J},
  issn         = {0035-9009},
  keyword      = {cloud resolving model,Hallett-Mossop process,ice splinters,riming},
  language     = {eng},
  number       = {575},
  pages        = {1513--1534},
  publisher    = {Royal Meteorological Society},
  series       = {Quarterly Journal of the Royal Meteorological Society},
  title        = {The glaciation of a cumulus cloud over New Mexico},
  url          = {http://dx.doi.org/10.1256/smsqj.57502},
  volume       = {127},
  year         = {2001},
}