Boundary-Layer Meteorology

, Volume 2, Issue 2, pp 246–254

Psychrometric apparatus for Bowen-ratio determination over forests

  • T. A. Black
  • K. G. McNaughton

DOI: 10.1007/BF00192133

Cite this article as:
Black, T.A. & McNaughton, K.G. Boundary-Layer Meteorol (1971) 2: 246. doi:10.1007/BF00192133


The psychrometric apparatus design for Bowen ratio determination reported previously by Sargeant and Tanner was modified and a new apparatus built. Modification of the intake design improved the symmetry and rigidity of the sensor mounting. Wet- and dry-bulb differences were measured with an error less than 0.01 °C over a vertical distance of 1 m. Continuous measurements of the Bowen ratio over a 7.8-m Douglas fir forest were made for 6 weeks. An example of the energy balance for the forest for one day using this equipment is reported.

Copyright information

© D. Reidel Publishing Company 1971

Authors and Affiliations

  • T. A. Black
    • 1
  • K. G. McNaughton
    • 1
  1. 1.Department of Soil ScienceUniversity of British ColumbiaVancouverCanada

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