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Permanent link (DOI): https://doi.org/10.7939/R32S4X

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Mixing height and Cloud Convection in the Canadian Prairies Open Access

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Other title
Subject/Keyword
Mixing height and Convection
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Stachowiak, Olga I
Supervisor and department
Reuter, Gerhard (Earth and Atmospheric Science)
Wilson, John ( Earth and Atmospheric Science)
Examining committee member and department
Wilson, John ( Earth and Atmospheric Science)
Gan,Thian( Civil and Environmental Engineering)
Reuter, Gerhard( Earth and Atmospheric Science)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2010-01-29T18:51:06Z
Graduation date
2010-06
Degree
Master of Science
Degree level
Master's
Abstract
The Mixing Height (MH), Convective Condensation Level (CCL), and Convective Available Potential Energy (CAPE) are computed with different methods and we examined whether these parameters can help to discriminate between weak and strong convection. The observational data set contains soundings released from Stony Plain in Alberta and The Pas in Manitoba for the summers of 2006 and 2007. The major findings were: 1) The Mixing Height values computed with the Heffter method were reliable provided the critical inversion criterion was adjusted for Prairie conditions. 2) The Mixing Height values computed with the Moist Mixed layer method were in good agreement with Mixing Heights computed with the Heffter method. 3) The Mixing Height values computed with the Holzworth parcel method were less useful in that often the potential temperature did not decrease with height above the ground. 4) Observed convective cloud base heights tended to be lower than the CCL computed using the surface parcel method, the 50 mb mixed parcel method, and the moist mixed parcel method. 5) The MH, the sounding-based CCL, and the CAPE did not differentiate between weak and strong convection. 6) We derived a new parameter: the difference between the convective cloud base and the Moist Air Mixing Height. This parameter did discriminate between the likely occurrence of strong and weak convection.
Language
English
DOI
doi:10.7939/R32S4X
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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