Open AccessA true eddy accumulation system for trace gas fluxes using disjunct eddy sampling method
Author(s) -
Rinne H. J. I.,
Delany A. C.,
Greenberg J. P.,
Guenther A. B.
Publication year - 2000
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2000jd900315
Subject(s) - eddy covariance , disjunct , trace gas , sampling (signal processing) , environmental science , atmospheric sciences , physics , ecology , population , detector , optics , ecosystem , biology , demography , sociology
A new true eddy accumulation flux measurement system, based on the disjunct sampling approach, has been developed and tested. In disjunct sampling, short, separate samples are taken instead of continuously sampling the air as in traditional relaxed eddy accumulation and eddy covariance systems. This method reduces the number of samples but allows more time to process them. Simulation shows that the fluxes, calculated using disjunct data, are close to those calculated using continuous data. The disjunct true eddy accumulation instrument was successfully deployed to measure monoterpene fluxes at Niwot Ridge, Colorado. The ability of the system to measure the sample flow accurately, critical for any eddy accumulation system, was tested using atmospheric CFC‐113 as a tracer, with good results. The system was capable of measuring relatively low α‐pinene fluxes, below 10 ng m −2 s −1 at T = 8°–18° C , over a subalpine forest.