Data Quality Reports for Session: 116999 User: dmfoper Completed: 01/14/2009

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D040217.2SGP/CO2FLX/C1 - Reprocessing User Notessgp30co2flx25mC1.b1, sgp30co2flx4mC1.b1, sgp30co2flx4mmetC1.b1, sgp30co2flx60mC1.b1
D041026.1SGP/CO2FLX/C1 - Reprocess: Unitssgp30co2flx25mC1.b1, sgp30co2flx4mC1.b1, sgp30co2flx60mC1.b1
D060107.1SGP/CO2FLX/C1 - Reprocess: calibration errorsgp30co2flx4mC1.b1
D071011.2SGP/CO2FLX/C1 - Reprocess: 4m instruments heightsgp30co2flx4mC1.b1
D081202.1SGP/CO2FLX/C1 - Reprocessed: Recalibrationsgp30co2flx4mC1.b1


DQRID : D040217.2
Start DateStart TimeEnd DateEnd Time
12/18/2002000002/17/20040000
Subject:
SGP/CO2FLX/C1 - Reprocessing User Notes
DataStreams:sgp30co2flx25mC1.b1, sgp30co2flx4mC1.b1, sgp30co2flx4mmetC1.b1, sgp30co2flx60mC1.b1
Description:
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.
Measurements:sgp30co2flx60mC1.b1:
  • height of base of instrument tower(site_elevation)
  • h(h)
  • latitude of instrument tower(site_latitude)
  • mean IRGA pressure(mean_p)
  • variance of c(var_c)
  • Date and time in alternate form(yyyydddhhmmss)
  • Virtual temperature (T)(mean_t)
  • mean horizontal wind speed(mean_rot_u)
  • Time offset of tweaks from base_time(time_offset)
  • variance of q(var_q)
  • variance of v(var_rot_v)
  • fractional day of the year(doy)
  • Vertical angle of wind(phi)
  • variance of w(var_rot_w)
  • Monin-Obukhov length scale(Lmoni)
  • variance of u(var_rot_u)
  • Unit Vector Wind Direction(wdir)
  • Friction velocity(ustar)
  • additive WPL LE correction to c flux(fc_wpl_le)
  • additive WPL H correction to c flux(fc_wpl_h)
  • base time(base_time)
  • rotation to zero w(theta)
  • longitude of instrument tower(site_longitude)
  • mean co2 concentration (c)(mean_c)
  • height of instument from tower base(zm)
  • variance of t(var_t)
  • WPL corrected CO2 flux(fc_corr)
  • Water vapor density (q)(mean_q)
  • Latent heat flux(le)
sgp30co2flx4mC1.b1:
  • mean IRGA pressure(mean_p)
  • variance of c(var_c)
  • variance of t(var_t)
  • Latent heat flux(le)
  • mean horizontal wind speed(mean_rot_u)
  • Vertical angle of wind(phi)
  • Monin-Obukhov length scale(Lmoni)
  • variance of q(var_q)
  • height of instument from tower base(zm)
  • longitude of instrument tower(site_longitude)
  • additive WPL LE correction to c flux(fc_wpl_le)
  • Virtual temperature (T)(mean_t)
  • Water vapor density (q)(mean_q)
  • h(h)
  • additive WPL H correction to c flux(fc_wpl_h)
  • Date and time in alternate form(yyyydddhhmmss)
  • Unit Vector Wind Direction(wdir)
  • mean co2 concentration (c)(mean_c)
  • variance of w(var_rot_w)
  • base time(base_time)
  • variance of u(var_rot_u)
  • variance of v(var_rot_v)
  • rotation to zero w(theta)
  • WPL corrected CO2 flux(fc_corr)
  • latitude of instrument tower(site_latitude)
  • Time offset of tweaks from base_time(time_offset)
  • Friction velocity(ustar)
  • height of base of instrument tower(site_elevation)
  • fractional day of the year(doy)
sgp30co2flx25mC1.b1:
  • base time(base_time)
  • Monin-Obukhov length scale(Lmoni)
  • Latent heat flux(le)
  • variance of t(var_t)
  • variance of u(var_rot_u)
  • Date and time in alternate form(yyyydddhhmmss)
  • variance of v(var_rot_v)
  • Vertical angle of wind(phi)
  • Unit Vector Wind Direction(wdir)
  • longitude of instrument tower(site_longitude)
  • latitude of instrument tower(site_latitude)
  • WPL corrected CO2 flux(fc_corr)
  • height of instument from tower base(zm)
  • variance of q(var_q)
  • Friction velocity(ustar)
  • variance of c(var_c)
  • additive WPL LE correction to c flux(fc_wpl_le)
  • mean IRGA pressure(mean_p)
  • variance of w(var_rot_w)
  • Virtual temperature (T)(mean_t)
  • fractional day of the year(doy)
  • mean co2 concentration (c)(mean_c)
  • rotation to zero w(theta)
  • mean horizontal wind speed(mean_rot_u)
  • height of base of instrument tower(site_elevation)
  • h(h)
  • additive WPL H correction to c flux(fc_wpl_h)
  • Water vapor density (q)(mean_q)
  • Time offset of tweaks from base_time(time_offset)
sgp30co2flx4mmetC1.b1:
  • average of four lower soil moisture sensors(mean_m_soil_lower)
  • standard error of mean_t_soil_middle note maximum of two values used in
    calculation(stderr_mean_t_soil_middle)
  • average of two middle soil temperature sensors(mean_t_soil_middle)
  • Time offset of tweaks from base_time(time_offset)
  • h(h)
  • additive WPL H correction to c flux(fc_wpl_h)
  • variance of v(var_rot_v)
  • Hourly precipitation(precip)
  • additive WPL LE correction to c flux(fc_wpl_le)
  • variance of u(var_rot_u)
  • rotation to zero w(theta)
  • standard error of mean_t_soil_lower note maximum of two values used in
    calculation(stderr_mean_t_soil_lower)
  • fractional day of the year(doy)
  • WPL corrected CO2 flux(fc_corr)
  • depth of soil heat flux probes(z_g_soil)
  • height of radiation instruments(zrad)
  • net solar radiation (NR-lite)(r_net)
  • depth of lower m soil probesp(z_m_soil_lower)
  • standard error of mean_m_soil_upper(stderr_mean_m_soil_upper)
  • mean co2 concentration (c)(mean_c)
  • height of lower RH/T sensor(z_lower)
  • Date and time in alternate form(yyyydddhhmmss)
  • Water vapor density (q)(mean_q)
  • variance of c(var_c)
  • depth of middle t soil probesm(z_t_soil_middle)
  • height of instument from tower base(zm)
  • photosynthetic photon flux density (PAR)(ppfd)
  • barometric pressure(bar_pres)
  • upwelling longwave hemispheric irradiance t_rad corrected(r_up_long_hemisp)
  • latitude of instrument tower(site_latitude)
  • mean air temperature, upper level(t_air_upper)
  • average of two lower soil temperature sensors(mean_t_soil_lower)
  • Unit Vector Wind Direction(wdir)
  • standard error of mean_t_soil_upper note maximum of two values used in
    calculation(stderr_mean_t_soil_upper)
  • mean horizontal wind speed(mean_rot_u)
  • Virtual temperature (T)(mean_t)
  • upwelling shortwave hemispheric irradiance t_rad corrected(r_up_short_hemisp)
  • mean relative humidity, lower level(rh_lower)
  • mean air temperature, lower level(t_air_lower)
  • variance of w(var_rot_w)
  • Latent heat flux(le)
  • mean IRGA pressure(mean_p)
  • downwelling shortwave hemispheric irradiance t_rad corrected(r_down_short_hemisp)
  • Friction velocity(ustar)
  • base time(base_time)
  • height of upper RH/T sensor(z_upper)
  • height of base of instrument tower(site_elevation)
  • variance of q(var_q)
  • standard error of mean_g_soil(stderr_mean_g_soil)
  • radiometer body temperature (for longwave correction)(t_rad)
  • longitude of instrument tower(site_longitude)
  • variance of t(var_t)
  • downwelling longwave hemispheric irradiance t_rad corrected(r_down_long_hemisp)
  • average of four upper soil moisture sensors(mean_m_soil_upper)
  • average of up to four soil heat flux sensors(mean_g_soil)
  • total downwelling shortwave radiation (LI-200 sensor)(r_tot)
  • depth of upper t soil probesm(z_t_soil_upper)
  • depth of upper m soil probesm(z_m_soil_upper)
  • Vertical angle of wind(phi)
  • depth of lower t soil probesm(z_t_soil_lower)
  • mean relative humidity, upper level(rh_upper)
  • standard error of mean_m_soil_lower(stderr_mean_m_soil_lower)
  • average of two upper soil temperature sensors(mean_t_soil_upper)
  • Monin-Obukhov length scale(Lmoni)

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DQRID : D041026.1
Start DateStart TimeEnd DateEnd Time
12/18/2002000010/12/20042359
Subject:
SGP/CO2FLX/C1 - Reprocess: Units
DataStreams:sgp30co2flx25mC1.b1, sgp30co2flx4mC1.b1, sgp30co2flx60mC1.b1
Description:
Mean CO2 density units are incorrectly labeled as umol m-3. Units should be labeled as 
mmol m-3.
Measurements:sgp30co2flx60mC1.b1:
  • mean co2 concentration (c)(mean_c)
sgp30co2flx4mC1.b1:
  • mean co2 concentration (c)(mean_c)
sgp30co2flx25mC1.b1:
  • mean co2 concentration (c)(mean_c)

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DQRID : D060107.1
Start DateStart TimeEnd DateEnd Time
05/27/2005000001/06/20062359
Subject:
SGP/CO2FLX/C1 - Reprocess: calibration error
DataStreams:sgp30co2flx4mC1.b1
Description:
A problem was identified with the calibration of the instrument performed on May 27, 2005. 
A study to correct this bad calibration is underway.
Measurements:sgp30co2flx4mC1.b1:
  • WPL corrected CO2 flux(fc_corr)
  • Water vapor density (q)(mean_q)
  • Latent heat flux(le)

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DQRID : D071011.2
Start DateStart TimeEnd DateEnd Time
12/17/2003000010/11/20070000
Subject:
SGP/CO2FLX/C1 - Reprocess: 4m instruments height
DataStreams:sgp30co2flx4mC1.b1
Description:
The height of the 4m instruments is 4.8 m and not 4.65 m as shown in b1 datastream
Measurements:sgp30co2flx4mC1.b1:
  • height of instument from tower base(zm)

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DQRID : D081202.1
Start DateStart TimeEnd DateEnd Time
05/26/2005000001/11/20062359
Subject:
SGP/CO2FLX/C1 - Reprocessed: Recalibration
DataStreams:sgp30co2flx4mC1.b1
Description:
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.
Measurements:sgp30co2flx4mC1.b1:
  • mean co2 concentration (c)(mean_c)

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