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Development of ice particles in convective clouds observed over the Black Forest mountains during COPS

Huang, Yahui and Blyth, Alan M. and Brown, Philip R. A. and Cotton, Richard and Crosier, Jonathan and Bower, Keith N. and Gallagher, Martin W. and Jones, Hazel and Gadian, Alan M. and Choularton, Tom W. and Cardwell, John and Coe, Hugh and Mobbs, Stephen D. and Hagen, Martin (2011) Development of ice particles in convective clouds observed over the Black Forest mountains during COPS. Quarterly Journal of the Royal Meteorological Society, 137, pp. 275-286. DOI: 10.1002/qj.749.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/qj.749/abstract

Abstract

A combination of modelling studies and ground-based and aircraft measurements is used to examine the development of ice particles in convective clouds observed over the Black Forest mountains during the Convective and Orographically-induced Precipitation Study (COPS). High concentrations of relatively small ice particles were observed in the weaker northern cell that developed on convergence lines over the mountains in the much-studied 15 July 2007 case. The conditions in the cloud were not conducive for the Hallett�Mossop process. Instead, the explanation for such high concentrations of ice is likely associated with the type of ice nuclei ingested into the cloud. Biological nuclei, oxidised organic aerosol particles in the polluted air vented from the Murg valley into the cloud base, and desert dust are all possible candidates. A model sensitivity test with biological nuclei produced similar concentrations of ice particles to the observations. In contrast, the high concentration of ice particles measured in clouds that advected over the Black Forest mountains on 11 July 2007 were likely due to the Hallett�Mossop process. The deep convective cell at the southern end of the COPS domain on 15 July 2007 developed in less polluted air than the shallower northern cloud. A model sensitivity test with lower aerosol loading produced a more vigorous cloud with a higher top, more precipitation, and greater reflectivity, more similar to the radar observations. The results suggest that aerosol particles vented out of the valleys could have a significant impact on orographically induced precipitation.

Document Type:Article
Title:Development of ice particles in convective clouds observed over the Black Forest mountains during COPS
Authors:
AuthorsInstitution or Email of Authors
Huang, YahuiUni of Leeds, UK
Blyth, Alan M.Uni of Leeds, UK
Brown, Philip R. A.Met Office, Exeter, UK
Cotton, RichardMet Office, Exeter, UK
Crosier, JonathanUni of Manchester, UK
Bower, Keith N.Uni of Manchester, UK
Gallagher, Martin W.Uni of Manchester, UK
Jones, HazelUni of Manchester, UK
Gadian, Alan M.Uni of Leeds, UK
Choularton, Tom W.Uni of Manchester, UK
Cardwell, JohnUni of Manchester, UK
Coe, HughUni of Manchester, UK
Mobbs, Stephen D.Uni of Leeds, UK
Hagen, MartinDLR
Date:1 December 2011
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:137
DOI:10.1002/qj.749
Page Range:pp. 275-286
Status:Published
Keywords:orographic clouds, ice nuclei, aerosol
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Jana Freund
Deposited On:13 May 2011 11:48
Last Modified:12 Dec 2013 21:17

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