Data Quality Reports for Session: 127314 User: jun1yin Completed: 04/20/2010

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
D041103.1SGP/CO2FLX/C1 - Mean CO2 density incorrect, CO2 flux suspectsgp30co2flx60mC1.b1
D070803.2SGP/CO2FLX/C1 - Disturbance around sitesgp30co2flx25mC1.b1, sgp30co2flx4mC1.b1, sgp30co2flx4mmetC1.b1, sgp30co2flx60mC1.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:sgp30co2flx4mC1.b1:
  • additive WPL H correction to c flux(fc_wpl_h)
  • fractional day of the year(doy)
  • mean horizontal wind speed(mean_rot_u)
  • additive WPL LE correction to c flux(fc_wpl_le)
  • variance of t(var_t)
  • Friction velocity(ustar)
  • base time(base_time)
  • variance of q(var_q)
  • variance of c(var_c)
  • h(h)
  • rotation to zero w(theta)
  • height of base of instrument tower(site_elevation)
  • Virtual temperature (T)(mean_t)
  • Water vapor density (q)(mean_q)
  • mean IRGA pressure(mean_p)
  • variance of w(var_rot_w)
  • variance of v(var_rot_v)
  • variance of u(var_rot_u)
  • Latent heat flux(le)
  • Date and time in alternate form(yyyydddhhmmss)
  • Vertical angle of wind(phi)
  • mean co2 concentration (c)(mean_c)
  • longitude of instrument tower(site_longitude)
  • WPL corrected CO2 flux(fc_corr)
  • Monin-Obukhov length scale(Lmoni)
  • Unit Vector Wind Direction(wdir)
  • Time offset of tweaks from base_time(time_offset)
  • latitude of instrument tower(site_latitude)
  • height of instument from tower base(zm)
sgp30co2flx4mmetC1.b1:
  • mean air temperature, lower level(t_air_lower)
  • mean co2 concentration (c)(mean_c)
  • depth of upper m soil probesm(z_m_soil_upper)
  • base time(base_time)
  • average of two upper soil temperature sensors(mean_t_soil_upper)
  • Unit Vector Wind Direction(wdir)
  • Vertical angle of wind(phi)
  • standard error of mean_m_soil_lower(stderr_mean_m_soil_lower)
  • mean relative humidity, upper level(rh_upper)
  • mean air temperature, upper level(t_air_upper)
  • height of upper RH/T sensor(z_upper)
  • downwelling longwave hemispheric irradiance t_rad corrected(r_down_long_hemisp)
  • average of four lower soil moisture sensors(mean_m_soil_lower)
  • total downwelling shortwave radiation (LI-200 sensor)(r_tot)
  • standard error of mean_g_soil(stderr_mean_g_soil)
  • fractional day of the year(doy)
  • mean IRGA pressure(mean_p)
  • Water vapor density (q)(mean_q)
  • Virtual temperature (T)(mean_t)
  • standard error of mean_t_soil_lower note maximum of two values used in
    calculation(stderr_mean_t_soil_lower)
  • average of four upper soil moisture sensors(mean_m_soil_upper)
  • radiometer body temperature (for longwave correction)(t_rad)
  • height of base of instrument tower(site_elevation)
  • standard error of mean_t_soil_middle note maximum of two values used in
    calculation(stderr_mean_t_soil_middle)
  • average of two lower soil temperature sensors(mean_t_soil_lower)
  • Date and time in alternate form(yyyydddhhmmss)
  • net solar radiation (NR-lite)(r_net)
  • mean relative humidity, lower level(rh_lower)
  • variance of w(var_rot_w)
  • height of lower RH/T sensor(z_lower)
  • variance of v(var_rot_v)
  • height of radiation instruments(zrad)
  • depth of lower t soil probesm(z_t_soil_lower)
  • variance of u(var_rot_u)
  • upwelling shortwave hemispheric irradiance t_rad corrected(r_up_short_hemisp)
  • average of up to four soil heat flux sensors(mean_g_soil)
  • rotation to zero w(theta)
  • additive WPL LE correction to c flux(fc_wpl_le)
  • longitude of instrument tower(site_longitude)
  • Friction velocity(ustar)
  • mean horizontal wind speed(mean_rot_u)
  • average of two middle soil temperature sensors(mean_t_soil_middle)
  • height of instument from tower base(zm)
  • barometric pressure(bar_pres)
  • downwelling shortwave hemispheric irradiance t_rad corrected(r_down_short_hemisp)
  • additive WPL H correction to c flux(fc_wpl_h)
  • Latent heat flux(le)
  • depth of lower m soil probesp(z_m_soil_lower)
  • depth of middle t soil probesm(z_t_soil_middle)
  • Monin-Obukhov length scale(Lmoni)
  • latitude of instrument tower(site_latitude)
  • upwelling longwave hemispheric irradiance t_rad corrected(r_up_long_hemisp)
  • depth of upper t soil probesm(z_t_soil_upper)
  • Time offset of tweaks from base_time(time_offset)
  • photosynthetic photon flux density (PAR)(ppfd)
  • standard error of mean_m_soil_upper(stderr_mean_m_soil_upper)
  • variance of t(var_t)
  • standard error of mean_t_soil_upper note maximum of two values used in
    calculation(stderr_mean_t_soil_upper)
  • Hourly precipitation(precip)
  • variance of q(var_q)
  • WPL corrected CO2 flux(fc_corr)
  • variance of c(var_c)
  • h(h)
  • depth of soil heat flux probes(z_g_soil)
sgp30co2flx60mC1.b1:
  • mean co2 concentration (c)(mean_c)
  • Virtual temperature (T)(mean_t)
  • Friction velocity(ustar)
  • mean IRGA pressure(mean_p)
  • Water vapor density (q)(mean_q)
  • Unit Vector Wind Direction(wdir)
  • height of instument from tower base(zm)
  • Time offset of tweaks from base_time(time_offset)
  • latitude of instrument tower(site_latitude)
  • Date and time in alternate form(yyyydddhhmmss)
  • variance of v(var_rot_v)
  • variance of u(var_rot_u)
  • variance of w(var_rot_w)
  • WPL corrected CO2 flux(fc_corr)
  • h(h)
  • variance of t(var_t)
  • rotation to zero w(theta)
  • fractional day of the year(doy)
  • base time(base_time)
  • Vertical angle of wind(phi)
  • longitude of instrument tower(site_longitude)
  • variance of q(var_q)
  • variance of c(var_c)
  • mean horizontal wind speed(mean_rot_u)
  • additive WPL H correction to c flux(fc_wpl_h)
  • Monin-Obukhov length scale(Lmoni)
  • Latent heat flux(le)
  • height of base of instrument tower(site_elevation)
  • additive WPL LE correction to c flux(fc_wpl_le)
sgp30co2flx25mC1.b1:
  • variance of c(var_c)
  • height of instument from tower base(zm)
  • Date and time in alternate form(yyyydddhhmmss)
  • Water vapor density (q)(mean_q)
  • mean IRGA pressure(mean_p)
  • additive WPL H correction to c flux(fc_wpl_h)
  • Virtual temperature (T)(mean_t)
  • Time offset of tweaks from base_time(time_offset)
  • base time(base_time)
  • height of base of instrument tower(site_elevation)
  • mean co2 concentration (c)(mean_c)
  • Vertical angle of wind(phi)
  • variance of t(var_t)
  • variance of q(var_q)
  • Monin-Obukhov length scale(Lmoni)
  • Unit Vector Wind Direction(wdir)
  • longitude of instrument tower(site_longitude)
  • latitude of instrument tower(site_latitude)
  • variance of u(var_rot_u)
  • variance of v(var_rot_v)
  • variance of w(var_rot_w)
  • mean horizontal wind speed(mean_rot_u)
  • fractional day of the year(doy)
  • h(h)
  • Friction velocity(ustar)
  • Latent heat flux(le)
  • WPL corrected CO2 flux(fc_corr)
  • rotation to zero w(theta)
  • additive WPL LE correction to c flux(fc_wpl_le)

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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:sgp30co2flx4mC1.b1:
  • mean co2 concentration (c)(mean_c)
sgp30co2flx60mC1.b1:
  • mean co2 concentration (c)(mean_c)
sgp30co2flx25mC1.b1:
  • mean co2 concentration (c)(mean_c)

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DQRID : D041103.1
Start DateStart TimeEnd DateEnd Time
10/13/2004190010/20/20041800
Subject:
SGP/CO2FLX/C1 - Mean CO2 density incorrect, CO2 flux suspect
DataStreams:sgp30co2flx60mC1.b1
Description:
A problem was identified with the calibration of the instrument over the time period 
October 12, 2004 to October 20, 2004. The offset of the instrument is known to be incorrect 
over this time frame, and a study of the gain of the instrument is underway.
Measurements:sgp30co2flx60mC1.b1:
  • mean co2 concentration (c)(mean_c)
  • WPL corrected CO2 flux(fc_corr)

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DQRID : D070803.2
Start DateStart TimeEnd DateEnd Time
07/24/2007130007/26/20072359
Subject:
SGP/CO2FLX/C1 - Disturbance around site
DataStreams:sgp30co2flx25mC1.b1, sgp30co2flx4mC1.b1, sgp30co2flx4mmetC1.b1, sgp30co2flx60mC1.b1
Description:
A bulldozer used to excavate the SGP Tower anchors was right around (within 10 feet) our 
systems.
Measurements:sgp30co2flx4mC1.b1:
  • WPL corrected CO2 flux(fc_corr)
  • mean co2 concentration (c)(mean_c)
sgp30co2flx4mmetC1.b1:
  • WPL corrected CO2 flux(fc_corr)
  • mean co2 concentration (c)(mean_c)
sgp30co2flx60mC1.b1:
  • mean co2 concentration (c)(mean_c)
  • WPL corrected CO2 flux(fc_corr)
sgp30co2flx25mC1.b1:
  • WPL corrected CO2 flux(fc_corr)
  • mean co2 concentration (c)(mean_c)

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