Measured wind speed trends on the west coast of Canada
Measured wind speed trends on the west coast of Canada
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DOI：
10.1002/joc.1073
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发表时间：
2004-09
期刊：
影响因子：
--
通讯作者：
S. Tuller
中科院分区：
文献类型：
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作者：
S. Tuller
在加拿大西海岸的四个站的实测风速的趋势进行了讨论。记录的时间段因台站而异。它们开始于20世纪40年代末或50年代，一直持续到20世纪90年代初至中期。时间序列中最显著的特征是，在记录的中间部分，圣詹姆斯角、维多利亚国际机场和温哥华国际机场的年平均风速和冬季风速下降。年平均风速的下降与平静百分比的增加和高风速观测值的减少相匹配。维多利亚、温哥华和科莫克斯之间的气压梯度、太平洋北美指数、太平洋年代际振荡指数以及不列颠哥伦比亚省和美国西北部的其他气候要素的趋势大致相同，表明风速降低是一种自然原因。然而，科莫克斯机场的平均风速增加了，这可能是风速计附近的摩擦力减小的结果超过了区域压力梯度的减小。版权所有© 2004年皇家气象学会
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 © 2004 Royal Meteorological Society