On the Direct Determination of the Turbulent Heat Flux Near the Ground

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  • a University of Washington, Seattle
  • | b Division of Meteorological Physics, CSIRO, Aspendale, Australia
  • | c Division of Plant Industry, CSIRO, Canberra, Australia
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Abstract

The results of a heat flux comparison experiment carried out at Hay, New South Wales, Australia, during May 1966 using a sonic anemometer thermometer (SAT), Fluxatron and Evapotron are reported. The instruments agree with each other to within a factor of 2 for individual runs. The large fluctuations from run to run of the individual estimates are mainly caused by the fact that the Eulerian point average does not provide an adequate statistical sample of the heat flux. This point is illustrated by the non-stationary behavior of the instantaneous product of vertical wind and temperature. As auxiliary results, values of σw/u* and σT/T* have been obtained which are somewhat higher than, but in general agreement with, observations reported by Mordukhovich and Zwang.

Abstract

The results of a heat flux comparison experiment carried out at Hay, New South Wales, Australia, during May 1966 using a sonic anemometer thermometer (SAT), Fluxatron and Evapotron are reported. The instruments agree with each other to within a factor of 2 for individual runs. The large fluctuations from run to run of the individual estimates are mainly caused by the fact that the Eulerian point average does not provide an adequate statistical sample of the heat flux. This point is illustrated by the non-stationary behavior of the instantaneous product of vertical wind and temperature. As auxiliary results, values of σw/u* and σT/T* have been obtained which are somewhat higher than, but in general agreement with, observations reported by Mordukhovich and Zwang.

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