Frequency of major avalanche winters

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Journal titleJournal of Glaciology
Pages4352; # of pages: 10
Subjectavalanches; climatology; snow (snowfall); time study; winter
AbstractA 70-year record has been compiled for avalanches affecting the Canadian Pacific Railway at Rogers Pass, British Columbia. Time series are presented for avalanche frequency, avalanche mass, and length of avalanche debris on the rail line for 26 avalanche paths as well as for winter snow-fall. Winters with the heaviest avalanche activity were 1971-72, 1934-35, 1919-20, 1932-33, and 1953-54. Time- series analysis indicates that the size of avalanches has decreased in recent decades. Spectral analysis shows avalanche activity to be similar to white noise but with a weak periodicity of about 18 years. An examination of the climatology of big avalanche winters reveals two distinct circulation patterns: a strong zonal flow with frequent Pacific storms and heavy snow-fall; or a pronounced meridional flow, Arctic air outbreaks, and catastrophic avalanching released by rapid advection of warm moist Pacific air. Major avalanche winters need not be big snow- fall winters.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number19450
NPARC number20331250
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Record identifier2c4b3f2d-c0ad-4a14-952c-c6207d4be878
Record created2012-07-18
Record modified2016-05-09
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