LI-COR conference papers for Ag and Forest Meteorology Conference and Atmospheric BioGeoSciences are now available on-line.
Influence of instrument surface heat exchange on CO₂ flux from open-path gas analyzers by George G. Burba, Dayle K. McDermitt, and Dan J. Anderson
From the introduction: “There have been many comparisons between open-path and closed-path sensors demonstrating substantially similar CO₂ flux measurements. However, there is growing evidence that shows differences between open-path and closed-path measurements, especially in the form of apparent off-season CO₂ uptake when it is physiologically unreasonable to expect it.
Measurements made with closed-path analyzers, chambers, and gradient methods have
consistently shown small releases of CO₂. To address this issue, a series of laboratory and field experiments were conducted to examine the influence of instrument surface temperature and heat exchange on the open-path CO₂ fluxes.”
Guidelines for Eddy Covariance Method by George G. Burba and Dan J. Anderson (http://ams.confex.com/ams/pdfpapers/137017.pdf)
From the introduction: Guidelines are presented for the Eddy Covariance micrometeorological technique of high-speed flux measurements of water, gas, heat, and momentum within the atmospheric boundary layer. This technique is widely used by micrometeorologists all over the globe.
However, a number of scientists from related disciplines outside of micrometeorology may not have been introduced to the information about this method, or may not be familiar enough with it to assess its usefulness within their research. With this in mind, step-by-step instructions were created to introduce a novice to general principles, requirements, applications, and processing steps of the conventional Eddy Covariance technique, to assist in further understanding the method through more advanced references such as textbooks, network guidelines and journal papers, and to help technicians, students and new researchers in the field deployment.