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Keyword: trace gas fluxes

Analysis of inadvertent microprocessor lag time on eddy covariance results

Publications Posted on: May 29, 2015
Researchers using the eddy covariance approach to measuring trace gas fluxes are often hoping to measure carbon dioxide and energy fluxes for ecosystem intercomparisons. This paper demonstrates a systematic microprocessor- caused lag of 20.1 to 20.2 s in a commercial sonic anemometer-analog-to-digital datapacker system operated at 10 Hz.

An analysis and implications of alternative methods of deriving the density (WPL) terms for eddy covariance flux measurements

Publications Posted on: May 23, 2013
We explore some of the underlying assumptions used to derive the density or WPL terms (Webb et al. (1980) Quart J RoyMeteorol Soc 106:85-100) required for estimating the surface exchange fluxes by eddy covariance. As part of this effort we recast the origin of the density terms as an assumption regarding the density fluctuations rather than as a (dry air) flux assumption.