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Cold Air Drainage in a Narrow Forested Valley

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Nocturnal downhill cold air drainage was monitored in a narrow, forested (ponderosa pine) valley in eastern Arizona. Vertical, horizontal, and temporal variations in air temperatures, canopy temperatures, surface vector winds, sky radiation, and inversion heights were determined across a section of the valley. Drainage winds in the forest were <2 m s-1, and a capping inversion formed above the canopy but below the valley rim. Net radiation ranged from -48 to 4 W m-2 air temperatures (below canopy) dropped from 2.2 to -4.9°C during the night, while canopy surface temperatures ranged from 9.5 to -2.0°C. Interactions of down-slope flows, valley flows, and canopy influences as the cold air drainage processes intensified throughout the night are described. Forest Sci. 29:357-370.
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Keywords: Katabatic flow

Document Type: Journal Article

Affiliations: Bureau of Air Quality Control, Arizona Public Health Service, Phoenix, Arizona

Publication date: 1983-06-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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