Abstract
Abstract. The occurrence of various types of winter precipitation
is an important issue over the southern Canadian Cordillera. This issue is
examined from January to April of 2010 by exploiting the high-resolution
Weather Research and Forecasting (WRF) model Version 3.4.1 dataset that was
used to simulate both a historical reanalysis-driven (control – CTRL) and a
pseudo-global-warming (PGW) experiment (Liu et al., 2016). Transition
regions, consisting of both liquid and solid precipitation or liquid
precipitation below 0 ∘C, occurred on 93 % and 94 % of the
days in the present and PGW future, respectively. This led to accumulated
precipitation within the transition region increasing by 27 % and was
associated with a rise in its average elevation by 374 m over the Coast Mountains and
Insular Mountains and by 240 m over the Rocky Mountains and consequently to
an eastward shift towards the higher terrain of the Rocky Mountains.
Transition regions comprised of only rain and snow were most common under
both the CTRL and PGW simulations, although all seven transition region
categories occurred. Transition region changes would enhance some of the
factors leading to avalanches and would also impact ski resort operations.
Funder
Natural Sciences and Engineering Research Council of Canada
Canada First Research Excellence Fund
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
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