Data Quality Report for Order ID: 187038
User ID: lopezcotoi1    Date completed: 2017-08-02
All DQRs
DQR ID Subject Affected Data Streams Data Quality Metric
D040505.5 SGP/CO2FLX/C1 - Longwave Radiation Incorrect sgp30co2flx4mmetC1.b1 Incorrect
D050316.1 SGP/CO2FLX/C1 - Reprocessed: User Notes sgp30co2flx4mmetC1.b1 Note
D040217.2 SGP/CO2FLX/C1 - Reprocessing User Notes sgp30co2flx4mmetC1.b1 Note
D060510.1 SGP/CO2FLX/C1 - Met stand was moved sgp30co2flx4mmetC1.b1 Note
D070803.2 SGP/CO2FLX/C1 - Disturbance around site sgp30co2flx60mC1.b1 Incorrect
D070918.3 SGP/CO2FLX/C1 - Farm operation sgp30co2flx4mmetC1.b1 Incorrect
D051116.2 SGP/CO2FLX/C1 - downwelling longwave hemispheric irradiance incorrect sgp30co2flx4mmetC1.b1 Incorrect
D070416.4 SGP/CO2FLX/C1 - downwelling longwave hemispheric irradiance incorrect sgp30co2flx4mmetC1.b1 Incorrect
D040217.3 SGP/CO2FLX/C1 - Reprocessing User Notes sgp30co2flx4mmetC1.b1 Note
D051116.3 SGP/CO2FLX/C1 - Soil Temperature measurements sgp30co2flx4mmetC1.b1 Note
 
DQR ID: D040505.5    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2003-12-18 00:00:00 2004-04-28 19:00:00 Incorrect
Subject: SGP/CO2FLX/C1 - Longwave Radiation Incorrect
Affected Datastreams: sgp30co2flx4mmetC1.b1
Description Long wave radiation values (r_up_long_hemisp, r_down_long_hemisp) are bad due to correction with bad radiometer body temperature (t_rad) resulting from a wiring issue.
Measurements
  • r_down_long_hemisp (downwelling longwave hemispheric irradiance t_rad corrected)
  • t_rad (radiometer body temperature (for longwave correction))
  • r_up_long_hemisp (upwelling longwave hemispheric irradiance t_rad corrected)
 
DQR ID: D050316.1    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2002-12-18 00:00:00 2005-03-15 23:59:00 Note
Subject: SGP/CO2FLX/C1 - Reprocessed: User Notes
Affected Datastreams: sgp30co2flx4mmetC1.b1
Description Replacement of LI-200 sensor (total downwelling shortwave radiation, variable r_tot) by a new LI-190 sensor (upwelling photosynthetic photon flux density, variable ppfd_up). The new LI-190 sensor was: - installed on December 9, 2004. - being tested from December 9, 2004 to December 22, 2004. - operational after December 22, 2004. Consequently: 1. variable "r_tot" is filled with missing values (qc_r_tot = 1) after December 9, 2004, 2. variable "ppfd_up" is filled with missing values (qc_ppfd_up = 1) prior December 22, 2004.
Measurements
  • r_tot (total downwelling shortwave radiation (LI-200 sensor))
  • ppfd_up (photosynthetic photon flux density (PAR))
 
DQR ID: D040217.2    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2002-12-18 00:00:00 2004-02-17 00:00:00 Note
Subject: SGP/CO2FLX/C1 - Reprocessing User Notes
Affected Datastreams: sgp30co2flx4mmetC1.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
  • theta (rotation to zero w)
  • mean_p (mean IRGA pressure)
  • precip (mean precipitation)
  • stderr_mean_t_soil_lower (standard error of mean_t_soil_lower note maximum of two values used in calculation)
  • var_q (variance of q)
  • mean_t (Mean t temperature (sonic anemometer))
  • le (le)
  • stderr_mean_t_soil_upper (standard error of mean_t_soil_upper note maximum of two values used in calculation)
  • r_down_short_hemisp (downwelling shortwave hemispheric irradiance t_rad corrected)
  • z_g_soil (depth of soil heat flux probes)
  • var_rot_u (Rotated variance u)
  • r_down_long_hemisp (downwelling longwave hemispheric irradiance t_rad corrected)
  • stderr_mean_g_soil (standard error of mean_g_soil)
  • z_t_soil_lower (depth of lower t soil probesm)
  • mean_m_soil_lower (average of four lower soil moisture sensors)
  • ustar (Friction velocity)
  • z_lower (height of lower RH/T sensor)
  • rh_lower (mean relative humidity, lower level)
  • zrad (height of radiation instruments)
  • var_t (variance of t)
  • r_net (net solar radiation (NR-lite))
  • stderr_mean_m_soil_upper (standard error of mean_m_soil_upper)
  • mean_m_soil_upper (average of four upper soil moisture sensors)
  • var_rot_w (Rotated variance w)
  • var_q (Variance of variable mean_q)
  • site_latitude (latitude of instument location)
  • t_rad (radiometer body temperature (for longwave correction))
  • fc_wpl_le (additive WPL LE correction to c flux)
  • ustar (friction velocity)
  • t_air_lower (mean air temperature, lower level)
  • var_rot_v (variance of v)
  • h (Sensible heat flux)
  • r_tot (total downwelling shortwave radiation (LI-200 sensor))
  • stderr_mean_m_soil_lower (standard error of mean_m_soil_lower)
  • stderr_mean_t_soil_middle (standard error of mean_t_soil_middle note maximum of two values used in calculation)
  • t_air_upper (mean air temperature, upper level)
  • r_up_long_hemisp (upwelling longwave hemispheric irradiance t_rad corrected)
  • ppfd (photosynthetic photon flux density (PAR))
  • bar_pres (barometric pressure)
  • fc_wpl_h (additive WPL H correction to c flux)
  • h (h)
  • z_m_soil_lower (depth of lower m soil probesp)
  • time_offset (Time offset from base_time)
  • var_rot_u (variance of u)
  • wdir (horizontal wind direction)
  • mean_t_soil_middle (average of two middle soil temperature sensors)
  • mean_t_soil_lower (average of two lower soil temperature sensors)
  • var_rot_v (Rotated variance v)
  • mean_t_soil_upper (average of two upper soil temperature sensors)
  • mean_g_soil (average of up to four soil heat flux sensors)
  • mean_rot_u (mean horizontal wind speed)
  • z_m_soil_upper (depth of upper m soil probesm)
  • doy (fractional day of the year)
  • mean_t (mean sonic temperature (t), i.e. virtual temperature)
  • r_up_short_hemisp (upwelling shortwave hemispheric irradiance t_rad corrected)
  • rh_upper (mean relative humidity, upper level)
  • mean_c (mean CO2 density)
  • Lmoni (Monin-Obukhov length scale)
  • z_t_soil_upper (depth of upper t soil probesm)
  • yyyydddhhmmss (start of integration interval)
  • phi (rotation to zero v)
  • phi (Rotation to v wind component = zero)
  • mean_q (Mean water vapor density)
  • mean_q (mean H2O density)
  • var_rot_w (variance of w)
  • mean_c (Mean CO2 density)
  • var_t (Variance of variable mean_t)
  • var_c (Variance of variable mean_c)
  • mean_rot_u (Rotated mean u)
  • zm (height of instument from tower base)
  • site_elevation (height of tower base from sea level)
  • z_t_soil_middle (depth of middle t soil probesm)
  • site_longitude (longitude of instument location)
  • var_c (variance of c)
  • z_upper (height of upper RH/T sensor)
  • fc_corr (WPL corrected CO2 flux)
  • base_time (Base time in Epoch)
 
DQR ID: D060510.1    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2006-04-11 15:30:00 2006-04-19 15:00:00 Note
Subject: SGP/CO2FLX/C1 - Met stand was moved
Affected Datastreams: sgp30co2flx4mmetC1.b1
Description Ameriflux program (Hank Loescher from Oregon state university) visits the site to intercompare his instruments with our 4m flux system. The met stand was moved by 30 feet and consequently: 1. Soil moisture sensors were disconnected, 2. Soil temperature sensors were disconnected, 3. Soil heat plates were disconnected, 4. The true direction of the anemometer boom was 230 degrees instead of the regular 270 degrees.
Measurements
  • mean_m_soil_lower (average of four lower soil moisture sensors)
  • wdir (horizontal wind direction)
  • mean_t_soil_middle (average of two middle soil temperature sensors)
  • mean_t_soil_lower (average of two lower soil temperature sensors)
  • mean_t_soil_upper (average of two upper soil temperature sensors)
  • mean_m_soil_upper (average of four upper soil moisture sensors)
  • mean_g_soil (average of up to four soil heat flux sensors)
 
DQR ID: D070803.2    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2007-07-24 13:00:00 2007-07-26 23:59:00 Incorrect
Subject: SGP/CO2FLX/C1 - Disturbance around site
Affected Datastreams: sgp30co2flx60mC1.b1
Description A bulldozer used to excavate the SGP Tower anchors was right around (within 10 feet) our systems.
Measurements
  • mean_c (mean CO2 density)
  • mean_c (Mean CO2 density)
  • fc_corr (WPL corrected CO2 flux)
 
DQR ID: D070918.3    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2007-08-22 18:30:00 2007-09-07 18:00:00 Incorrect
Subject: SGP/CO2FLX/C1 - Farm operation
Affected Datastreams: sgp30co2flx4mmetC1.b1
Description Soil temperature, soil moisture, soil heat flux and upwelling surface radiation (long, short, and PAR) measurements were not valid from 20070822 to 20070907 due to farm operations.
Measurements
  • stderr_mean_m_soil_upper (standard error of mean_m_soil_upper)
  • mean_m_soil_upper (average of four upper soil moisture sensors)
  • stderr_mean_t_soil_middle (standard error of mean_t_soil_middle note maximum of two values used in calculation)
  • mean_m_soil_lower (average of four lower soil moisture sensors)
  • r_up_short_hemisp (upwelling shortwave hemispheric irradiance t_rad corrected)
  • stderr_mean_m_soil_lower (standard error of mean_m_soil_lower)
  • r_up_long_hemisp (upwelling longwave hemispheric irradiance t_rad corrected)
  • stderr_mean_t_soil_lower (standard error of mean_t_soil_lower note maximum of two values used in calculation)
  • stderr_mean_t_soil_upper (standard error of mean_t_soil_upper note maximum of two values used in calculation)
  • mean_t_soil_middle (average of two middle soil temperature sensors)
  • mean_t_soil_lower (average of two lower soil temperature sensors)
  • mean_t_soil_upper (average of two upper soil temperature sensors)
  • stderr_mean_g_soil (standard error of mean_g_soil)
  • mean_g_soil (average of up to four soil heat flux sensors)
  • ppfd_up (photosynthetic photon flux density (PAR))
 
DQR ID: D051116.2    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2004-04-28 19:00:00 2005-11-16 00:00:00 Incorrect
Subject: SGP/CO2FLX/C1 - downwelling longwave hemispheric irradiance incorrect
Affected Datastreams: sgp30co2flx4mmetC1.b1
Description A problem was identified with the downwelling longwave hemispheric irradiance (variable "r_down_long_hemisp") calibration of our Kipp & Zonen CNR1 radiometer. The offset of the instrument is believed to be incorrect over the specified time frame, and a correction of the problem is underway.
Measurements
  • r_down_long_hemisp (downwelling longwave hemispheric irradiance t_rad corrected)
 
DQR ID: D070416.4    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2004-04-28 00:00:00 2007-04-02 19:30:00 Incorrect
Subject: SGP/CO2FLX/C1 - downwelling longwave hemispheric irradiance incorrect
Affected Datastreams: sgp30co2flx4mmetC1.b1
Description Downwelling longwave radiation measurements (variable "r_down_long_hemisp") are bad due to a wiring issue. Users should not use the downwelling longwave hemispheric irradiance during this period. The downwelling shortwave and longwave radiation at CF is also available from the Broadband Radiometer Station (BRS).
Measurements
  • r_down_long_hemisp (downwelling longwave hemispheric irradiance t_rad corrected)
 
DQR ID: D040217.3    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2002-12-18 00:00:00 2003-12-18 00:00:00 Note
Subject: SGP/CO2FLX/C1 - Reprocessing User Notes
Affected Datastreams: sgp30co2flx4mmetC1.b1
Description A subset of the radiation measurements had an incorrect gain applied to raw data in period from 20021218-20031218. To correct for this, a multiplicative correction factor of 1.11 were applied to raw data used for the following variables: r_down_short_hemisp r_down_long_hemisp r_up_short_hemisp r_up_long_hemisp Note that the long wave variables are computed by adding the black body thermal radiation from the radiometer body to each of the long wave signals. Hence, the multiplicative correction is applied to the raw long wave fluxes before adding in the flux from the radiometer body.
Measurements
  • r_down_long_hemisp (downwelling longwave hemispheric irradiance t_rad corrected)
  • r_down_short_hemisp (downwelling shortwave hemispheric irradiance t_rad corrected)
  • r_up_long_hemisp (upwelling longwave hemispheric irradiance t_rad corrected)
  • r_up_short_hemisp (upwelling shortwave hemispheric irradiance t_rad corrected)
 
DQR ID: D051116.3    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2002-12-18 00:00:00 2005-11-16 00:00:00 Note
Subject: SGP/CO2FLX/C1 - Soil Temperature measurements
Affected Datastreams: sgp30co2flx4mmetC1.b1
Description Current data quality check (qc) procedure does not catch spikes in soil temperature measurements. A new qc procedure is being tested and will improve the current procedure.
Measurements
  • mean_t_soil_middle (average of two middle soil temperature sensors)
  • mean_t_soil_lower (average of two lower soil temperature sensors)
  • mean_t_soil_upper (average of two upper soil temperature sensors)