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Permanent link (DOI): https://doi.org/10.7939/R3ND99

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Estimating Visibility during Snowfall Using Radar Open Access

Descriptions

Other title
Subject/Keyword
snow
visibility
radar
estimating
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Qian, D. Mary
Supervisor and department
Gerhard W. Reuter/Department of Earth and Atmosphere Sciences
Examining committee member and department
Frances Fenrich /Department of Physics
John D. Wilson /Department of Earth and Atmosphere Sciences
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2012-09-06T09:52:23Z
Graduation date
2012-09
Degree
Master of Science
Degree level
Master's
Abstract
To estimate the visibility during snowfall, we compare hourly visibility (Vis) measurements with radar reflectivity factor (Z) measurements sampled over Edmonton International Airport during snowfall events from October 2010 to April 2011. The (Z, Vis) scatter diagrams showed that increasing Z was correlated with decreasing Vis. For a given Z observation, we found the probability distribution of Vis. The interquartile range with Z ≥ 20 dBZ was smaller than the IQR with Z < 20 dBZ. The scatter was not significantly affected by the temperature profile or the wet bulb potential temperature. Strong wind speed (≥15 knots) along with high reflectivity was associated low Vis (< 2 sm). Radar reflectivity data has valuable information for visibility, yet is not a substitute for human observations.
Language
English
DOI
doi:10.7939/R3ND99
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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