Measured wind speed trends on the west coast of Canada

被引:112
作者
Tuller, SE [1 ]
机构
[1] Univ Victoria, Dept Geog, Victoria, BC V8W 3P5, Canada
关键词
wind speed trends; Pacific decadal oscillation; Pacific North American index; pressure triangle wind speeds;
D O I
10.1002/joc.1073
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Trends in measured wind speed are discussed for four stations on the west coast of Canada. Periods of record vary with the station. They begin in the late 1940s or the 1950s and run through to the early to mid 1990s. The most prominent feature of the time series was a decline in mean annual and winter wind speeds at Cape St James, Victoria International Airport, and Vancouver International Airport during the middle portion of the record. Declines in mean annual wind speed are matched by increases in the percentage of calms and decreases in high wind speed observations. The pressure gradient between Victoria, Vancouver and Comox, the Pacific North American index, the Pacific decadal oscillation index, and other climate elements in British Columbia and the northwestern USA show trends at roughly the same time, indicating a natural cause of the wind speed decrease. Comox Airport mean wind speeds increased, however, perhaps the result of reduced friction in the vicinity of the anemometer outweighing the decrease in the regional pressure gradient. Copyright (C) 2004 Royal Meteorological Society.
引用
收藏
页码:1359 / 1374
页数:16
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