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Stability dependence of the relaxed eddy accumulation coefficient for various scalar quantities

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons100832

Ammann,  C.
Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons101133

Meixner,  F. X.
Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Ammann, C., & Meixner, F. X. (2002). Stability dependence of the relaxed eddy accumulation coefficient for various scalar quantities. Journal of Geophysical Research, 107(D7-D8): 4071. doi:10.1029/2001JD000649.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-912A-2
Abstract
[1] The coefficient b of the relaxed eddy accumulation (REA) technique was investigated by simulation studies using extensive high-resolution eddy correlation data sets of three different scalar quantities: the air temperature and the concentrations of CO2 and H2O. Measurements were performed in June-July 1995 over a senescent cereal field in the Rhineland- Palatinate region of southwestern Germany. The wide range of stability conditions during the experiment made it possible to describe the coefficient b as a function of the dimensionless stability parameter z/L within the framework of the Monin- Obukhov similarity theory. In good agreement with previous publications, a constant value of about 0.56 was obtained for unstable and near-neutral conditions if no dead band applied. For stable conditions, however, a significant increase with stability was observed which could be well described by a logarithmic functional relationship between b and z/L. By additional dead-band simulation studies the relationship was extended to variable dead-band widths. The observed dependency on z/L is interpreted in relation to the bivariate joint frequency distribution of the vertical wind speed and the scalar quantity.