Field measurements of n-factors for natural forest areas, Mackenzie Valley, Northwest Territories
Citations Over Time
Abstract
The n-factor is defined as the ratio of the ground surface index of seasonal thawing (or freezing) to the air index of seasonal thawing (or freezing). Equivalently, the n-factor relates mean seasonal ground surface temperatures to the more readily available mean air temperatures. In geotechnical engineering calculations, the n-factor for a phase change season is a single parameter that represents the complex process of heat transfer through vegetation and snowcover. In 1993-94, the GSC established a latitudinal transect along the Mackenzie River valley using inexpensive miniature data loggers to record air and ground temperatures. N-factors calculated from the first year of data reflect the diverse forest, vegetation, and snowcover. Freezing season n-factors are lower because of the attenuation effect of snow, in addition to that of vegetation. N-factors may be used in quantitative permafrost mapping and climate change-permafrost impact prediction.
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