SGP/PGS/C1 - Reprocessing User Notes

Precise Gas System (pgs) daily b1 files should have a dimension of 480, corresponding to a 
measurement every 3 minutes. Previously submitted files had a dimension of 481, the last 
time step of each individual file being mistakenly repeated.

Data users should take note of the changes.

• longitude of instument location(site_longitude)
• calibration coefficient 3 (quadratic fit) 90% confidence limit(coeff3_se)
• calibration coefficient 1 (quadratic fit) 90% confidence limit(coeff1_se)
• Temperature in refigerator(t_refrig)
• MFRSR channels(channel)
• Pressure of channel 2(pres2)
• surface pressure(pres1)
• Pressure of channel 4(pres4)
• Slope of CO2 readings during last 30sec of 3min period of raw data(co2mv_slope)
• r-squared of quadratic fit(r2)
• Pressure of channel 3(pres3)
• calibration coefficient 3 (quadratic fit)(coeff3)
• calibration coefficient 2 (quadratic fit)(coeff2)
• calibration coefficient 1 (quadratic fit)(coeff1)
• pressure inside the IRGA box measured by the pressure controller(pres_ctrlr)
• p-value of co2 readings during the last 30sec of 3min period of raw data(co2mv_slope_pval)
• flag indicating which channel isotope sample was taken from(iso)
• latitude of instument location(site_latitude)
• calculated concentration of CO2(co2ppm)
• reading of CO2 in mV(co2mv)
• Second level of QC, see reject_flag_explanation global attribute(reject_flag)
• calibration coefficient 2 (quadratic fit) 90% confidence limit(coeff2_se)
• reference CO2 reading in mV(ref)
• First level of QC, see warn_flag_explanation global attribute(warn_flag)
• height of base of instrument tower(site_elevation)
• flow rate measured by the mass flow controller(flow_rate)
• standard deviation of co2mv(co2mv_se)
• Date and time in alternate form(yyyymmddhhmmss)
• 90% confidence limint of co2mv_slope(co2mv_slope_se)
• temperature of the IRGA(t_irga)
• Number of measurements for indicated channel(nmeas)
• adjusted CO2(adj)
• 90% confidence limit of co2ppm(co2ppm_se)
• base time in epoch(base_time)