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A statistical procedure to determine recent climate change of extreme daily meteorological data as applied at two locations in Northwestern North America |
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| Authors: | Joseph M Caprio Harvey A Quamme Kelly T Redmond |
| Institution: | 1. Montana State University, 1801 Willow Way, Bozeman, MT, 59715, USA 2. Agriculture and Agri-Food Canada Pacific, Agri-Food Research Centre, Summerland, BC, Canada, V0H 1Z0 3. Western Regional Climate Center, Atmospheric Sciences Division, Desert Research Institute, 2215 Raggio Parkway, Reno, NV, 89512, USA |
| Abstract: | An iterative chi-square method is applied to determine recent climate change of extremes of daily minimum temperature at two locations between an 18-year recent period and a 36-year prior period. The method determines for each of two locations in northwestern North America, Bozeman, Montana, USA and Coldstream, British Columbia, Canada, which values of the extreme daily weather elements are most significantly different between the prior years and the recent years and gives a measure of the weekly significance of that difference. Determination was made of the average percent of each recent year date (plotted weekly) that was impacted by extreme weather due to climate change as well as the percentage change in the frequency of the number of extreme days for each period of contiguous significant weeks. During the recent period at both locations, most weeks experienced a greater number of days of extreme high minimum temperature and a fewer number of days of extreme low minimum temperature. The weekly percentage changes indicate that extreme high minimum temperatures at both Bozeman and Coldstream are increasing at the rate of about 10% per decade, with a close corresponding decrease of extreme low minimum temperatures. The major changes in climate were very similar at both locations, with greatest warming occurring during the late winter and early spring and during the late July to August period. |
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