Stability Dependence of the Eddy-Accumulation Coefficients for Momentum and Scalars |
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| Authors: | Edgar L Andreas Reginald J Hill James R Gosz Douglas I Moore William D Otto Achanta D Sarma |
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| Institution: | (1) U.S. Army Cold Regions Research and Engineering Laboratory, 72 Lyme Road, Hanover, New Hampshire, 03755-1290, U.S.A.;(2) National Oceanic and Atmospheric Administration, Environmental Technology Laboratory, 325 Broadway, Boulder, Colorado, 80303-3328, U.S.A;(3) Biology Department, University of New Mexico, Albuquerque, New Mexico, 87131, U.S.A.;(4) R. & T. Unit for Navigational Electronics, Osmania University, Hyderabad –, 500007, India |
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| Abstract: | From a set of turbulence data collected with a three-axis sonic anemometer/thermometer and described in a companion paper, we simulate the eddy-accumulation process for sensible heat and momentum fluxes. The resulting eddy-accumulation coefficient for momentum clearly depends on surface-layer stability; at neutral stability, its value is 0.63. On supplementing the scalar eddy-accumulation coefficients that we derive from our sensible heat flux data with values of sensible and latent heat flux coefficients reported by Businger and Oncley, we also find that scalar eddy-accumulation coefficients depend on stability, though more weakly than does the momentum coefficient. The coefficients for sensible and latent heat show no significant difference; we, thus, fit them with one function of stability whose value is 0.52 for neutral stratification. |
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| Keywords: | Eddy-accumulation coefficients Eddy-accumulation method Flux-measurement techniques Momentum flux Scalar flux Sonic anemometer/thermometer |
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