ISSN:
1573-1472
Keywords:
Eddy-accumulation coefficients
;
Eddy-accumulation methods
;
Gram-Charlier distribution
;
Higher-order moments
;
Statistics of turbulence
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract Increased usage of the conditional sampling techniques of the relaxed eddy accumulation method of measuring trace gas fluxes from vegetation raises questions as to the physical meaning of the β factor. Using sensible heat flux data to calculate β by comparison of the eddy covariance and conditional sampling algorithms suggests a mean value of 0.56. A theoretical approach based on the Gram-Charlier distribution is shown to need cross product terms up to the 4th order to provide a good description of β by taking into account the skewness and flatness of the distributions of the components of wind velocity and scalars. This description also shows that β is not constant but will vary with turbulence characteristics in time and space. Values of β for scalar and momentum fluxes are shown to vary over a typical range of 0.40 to 0.63.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1002061514948
