EasyFlux PC

EasyFlux™ PC is a free computer program that processes high frequency time series data, collected using a Campbell Scientific eddy-covariance flux system, into fluxes following community accepted practices. Fully corrected fluxes of CO₂, latent heat (H₂O), sensible heat, and momentum are available in generic, AmeriFlux, and GHG-Europe ASCII formats.

Provides fully corrected outputs of CO₂ flux, latent heat flux, and sensible heat flux at a user-defined interval (e.g., 30 minutes). Also provides many other variables of atmospheric properties, instrument diagnostics, and intermediate corrections.

Default processing:

• Despike and filter data using sonic anemometer and gas analyzer diagnostic codes, signal strengths, and measurements output range threshold.
• Apply coordinate rotation with an option to use the double rotation method (Tanner and Thurtell, 1969) or planar fit method (Wilczak et al., 2001).
• Lag CO₂ and H₂O measurement against sonic wind measurement for maximization of CO₂ and H₂O flux (Horst and Lenschow, 2009; Foken et al., 2012).
• Apply low frequency correction following Moncrieff et al., 2004.
• Apply high frequency corrections following Moncrieff et al., 1997; Massman, 2000, 20001; or Horst, 1997.
• Correct sonic temperature for the effect of humidity following van Dijk et al., 2004.
• Apply correction for air density fluctuation using Webb et al., 1980.
• QA/QC data quality checks following Foken, 2003.