Carbon Dioxide Flux Measurement Systems (CO2FLX) - IOP
Instrument Categories: Atmospheric Carbon
General Overview
![Picture of the Carbon Dioxide Flux Instruments (CO2FLX)](https://webarchive.library.unt.edu/eot2008/20081105032113im_/http://www.arm.gov/instruments/images/co2flx.jpg)
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.
IOPs Where the Instrument was Used
Precision Gas Sampling (PGS) Validation Field Campaign
Southern Great Plains, 2001-07-11 -- 2001-07-25
Precision Gas Sampling (PGS) Validation Field Campaign
Southern Great Plains, 2002-01-01 -- 2002-07-31
Precision Gas Sampling (PGS) Validation Field Campaign
Southern Great Plains, 2003-04-02 -- 2003-09-02
Precision Gas Sampling (PGS) Validation Field Campaign
Southern Great Plains, 2007-01-01 -- 2007-12-31
Precision Gas Sampling (PGS) Validation Field Campaign
Southern Great Plains, 2005-03-08 -- 2006-01-08
Precision Gas Sampling (PGS) Validation Field Campaign
Southern Great Plains, 2006-01-01 -- 2006-12-31
Precision Gas Sampling (PGS) Validation Field Campaign
Southern Great Plains, 2004-04-15 -- 2004-12-15
Primary Measurements Taken
The following measurements are those considered scientifically relevant. Refer to the datastream (netcdf) file headers for the list of all available measurements, including those recorded for diagnostic or quality assurance purposes.
- CO2 flux
- Soil moisture
- CO2 concentration
- Horizontal wind
- Soil temperature
- Atmospheric pressure
- Latent heat flux
- Sensible heat flux
- Atmospheric moisture
- Vertical velocity
- Atmospheric turbulence
- Virtual temperature
- Longwave broadband upwelling irradiance
- Longwave broadband downwelling irradiance
- Shortwave broadband total upwelling irradiance
- Shortwave broadband total downwelling irradiance
Mentor(s)
Marc Fischer
(510) 486-5539
mlfischer@lbl.gov
Sebastien Biraud
associate
510-486-6084
scbiraud@lbl.gov