Instrument : Carbon Dioxide Flux Measurement Systems (CO2FLX)

Instrument Categories
Atmospheric Carbon

General Overview

The Southern Great Plains (SGP) carbon dioxide flux (CO2 flux) measurement systems provide half-hour average fluxes of CO2, H2O (latent heat), and sensible heat. The fluxes are obtained by the eddy covariance technique, which computes the flux as the mean product of the vertical wind component with CO2 and H2O densities, or estimated virtual temperature. A three-dimensional sonic anemometer is used to obtain the orthogonal wind components and the virtual (sonic) temperature. An infrared gas analyzer is used to obtain the CO2 and H2O densities. A separate sub-system also collects half-hour average measures of meteorological and soil variables from separate 4-m towers.

Output Datastreams

  • 30co2flx25m : Eddy Correlation CO2 Flux Data: 25 m samples, 30-min stats
  • 30co2flx4m : Eddy Correlation CO2 Flux Data: 4 m samples, 30-min stats
  • 30co2flx4mmet : Eddy Correlation CO2 Flux Data: 4 m samples, meteorological data, 30-min stats
  • 30co2flx60m : Eddy Correlation CO2 Flux Data: 60 m samples, 30-min avg

Primary Measurements

The following measurements are those considered scientifically relevant.


Southern Great Plains
SGPC1 Browse Data Browse PlotsCentral Facility, Lamont, OK


Sebastien Biraud
Lawrence Berkeley National Laboratory

Dave Billesbach
University of Nebraska, Lincoln
(402) 472-7961

Stephen Chan
Lawrence Berkeley National Laboratory
510 486 4194