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Vertical Air Temperature Profiles in a Pine Stand: Spatial Variation and Scaling Problems

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Abstract:

Vertical profiles of air temperature were measured at several locations between trees in an even-aged stand of lodgepole pine. The results indicate horizontal temperature variation in the crown space can be sufficient to dominate the local subcanopy pressure distribution and that the divergence in the horizontal movement of sensible heat through the stand at any point could be comparable to that in the vertical. An approximate space averaging of the sensible heat balance for a nonuniform canopy is used to derive a scaling relation. This is used to combine the collection of temperature profiles taken near noon on clear days at the different locations into a composite temperature profile characteristic of the stand under such conditions. This composite profile indicates local maximum temperatures at the level of maximum foliage concentration and at the floor of the stand. Forest Sci. 20:64-73.

Keywords: Heat; energy balance; forest meteorology; micrometeorology; sampling

Document Type: Journal Article

Affiliations: Meteorologist, Rocky Mountain Forest and Range Experiment Station, USDA Forest Service, Fort Collins, Colorado, in cooperation with Colorado State University

Publication date: March 1, 1974

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