ORNL FACE CO2 Concentration Data

CO2 concentration data are available for 1999-2006. There is an hourly file for each year which contains elevated and ambient CO2 concentrations. The 2007 file will be updated as data become available. These data files include FACE site measurements of CO2 concentrationsfor rings 1, 2, 4, and 5. Rings 1 and 2 are elevated CO2 concentrations, and rings 4 and 5 are ambient CO2 concentrations. CO2 is sampled continuously from the top of the canopy at the center of eachring and is measured with a LiCor 6252 infrared gas analyzer located in an instrument shed next to each ring. Wind speed and wind directionabove the canopy and solar angle also are recorded. In addition, ambientCO2 concentrations (ring 0) measured at Building 0813, approximately 0.5 km from the FACE site, are included in the files.