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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. Wiley. 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.

Item URL in elib:https://elib.dlr.de/69817/
Document Type:Article
Title:Development of ice particles in convective clouds observed over the Black Forest mountains during COPS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Huang, YahuiUni of Leeds, UKUNSPECIFIED
Blyth, Alan M.Uni of Leeds, UKUNSPECIFIED
Brown, Philip R. A.Met Office, Exeter, UKUNSPECIFIED
Cotton, RichardMet Office, Exeter, UKUNSPECIFIED
Crosier, JonathanUni of Manchester, UKUNSPECIFIED
Bower, Keith N.Uni of Manchester, UKUNSPECIFIED
Gallagher, Martin W.Uni of Manchester, UKUNSPECIFIED
Jones, HazelUni of Manchester, UKUNSPECIFIED
Gadian, Alan M.Uni of Leeds, UKUNSPECIFIED
Choularton, Tom W.Uni of Manchester, UKUNSPECIFIED
Cardwell, JohnUni of Manchester, UKUNSPECIFIED
Coe, HughUni of Manchester, UKUNSPECIFIED
Mobbs, Stephen D.Uni of Leeds, UKUNSPECIFIED
Hagen, MartinDLRUNSPECIFIED
Date:1 December 2011
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:137
DOI :10.1002/qj.749
Page Range:pp. 275-286
Publisher:Wiley
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: Freund, Jana
Deposited On:13 May 2011 11:48
Last Modified:31 Jul 2019 19:31

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