SGP/CO2FLX/C1 - Reprocessing User Notes

Format Changes:
  To comply with archive standards, the name of the unlimited dimention variable in the 
cdf level b1 files was changed from 'record' to 'time'. This does not affect data quality.

• site_elevation
• yyyydddhhmmss
• WPL corrected CO2 flux(fc_corr)
• Mean sonic temp(mean_t)
• Additive WPL H correction to c flux(fc_wpl_h)
• Mean H2O density(mean_q)
• mean_p
• phi
• doy
• Mean horizontal wind speed(mean_rot_u)
• Monin-Obukhov length scale(Lmoni)
• Wind speed, W-to-E component, at altitude, derived from ETA model(wdir)
• Additive WPL LE correction to fc(fc_wpl_le)
• variance of variable t(var_t)
• friction velocity(ustar)
• time_offset
• Mean CO2 density(mean_c)
• site_latitude
• base_time
• Variance of rotated w(var_rot_w)
• Variance of v(var_rot_v)
• Variance of rotated u(var_rot_u)
• Variance of q(var_q)
• site_longitude
• Variance of c(var_c)
• zm
• Corrected sensible heat flux(h)
• WPL corrected latent heat flux(le)
• theta

SGP/CO2FLX/C1 - Reprocess: Units

Mean CO2 density units are incorrectly labeled as umol m-3. Units should be labeled as 
mmol m-3.

• Mean CO2 density(mean_c)

SGP/CO2FLX/C1 - Reprocess: calibration error

A problem was identified with the calibration of the instrument performed on May 27, 2005. 
A study to correct this bad calibration is underway.

• Mean H2O density(mean_q)
• WPL corrected CO2 flux(fc_corr)
• WPL corrected latent heat flux(le)

SGP/CO2FLX/C1 - Disturbance around site

A bulldozer used to excavate the SGP Tower anchors was right around (within 10 feet) our 
systems.

• WPL corrected CO2 flux(fc_corr)
• Mean CO2 density(mean_c)

SGP/CO2FLX/C1 - Reprocessing Notice (RID 432)

See below for details of reprocessing that was completed on 20141217.  Original DQR 
category: 5 (Transparent - Does not affect quality).

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The height of the 4m instruments is 4.8 m and not 4.65 m as shown in b1 datastream

• zm

SGP/CO2FLX/C1 - Reprocessed: Recalibration

The 4m CO2 flux system was calibrated on May 25, 2005. After the calibration was 
performed, calibration coefficients used to measure CO2 density were not updated. This added an 
OFFSET to the CO2 density measurements.

The data have been reprocessed to address the offset.  The reprocessed data were archived 
in December 2008. Please retrieve the updated files for use in your analysis.

• Mean CO2 density(mean_c)