Data Quality Reports for Session: 117283 User: arunchandr Completed: 02/02/2009


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D040217.2SGP/CO2FLX/C1 - Reprocessing User Notessgp30co2flx25mC1.b1, sgp30co2flx4mC1.b1, sgp30co2flx4mmetC1.b1, sgp30co2flx60mC1.b1
D040217.3SGP/CO2FLX/C1 - Reprocessing User Notessgp30co2flx4mmetC1.b1
D040505.5SGP/CO2FLX/C1 - Longwave Radiation Incorrectsgp30co2flx4mmetC1.b1
D041026.1SGP/CO2FLX/C1 - Reprocess: Unitssgp30co2flx25mC1.b1, sgp30co2flx4mC1.b1, sgp30co2flx60mC1.b1
D041103.1SGP/CO2FLX/C1 - Mean CO2 density incorrect, CO2 flux suspectsgp30co2flx60mC1.b1
D050316.1SGP/CO2FLX/C1 - Reprocessed: User Notessgp30co2flx4mmetC1.b1
D051031.3SGP/ECOR/E14 - CO2/H2O Incorrectsgp30ecorE14.b1
D051116.2SGP/CO2FLX/C1 - downwelling longwave hemispheric irradiance incorrectsgp30co2flx4mmetC1.b1
D051116.3SGP/CO2FLX/C1 - Soil Temperature measurementssgp30co2flx4mmetC1.b1
D051216.2SGP/ECOR/E14 - Flux Measurements Incorrectsgp30ecorE14.b1
D060107.1SGP/CO2FLX/C1 - Reprocess: calibration errorsgp30co2flx4mC1.b1
D060510.1SGP/CO2FLX/C1 - Met stand was movedsgp30co2flx4mmetC1.b1
D070223.1SGP/ECOR/E14 - Fluxes and Most Measurements Incorrectsgp30ecorE14.b1
D070416.4SGP/CO2FLX/C1 - downwelling longwave hemispheric irradiance incorrectsgp30co2flx4mmetC1.b1
D070514.2SGP/ECOR/E14 - IRGA Temperature Incorrect or Missingsgp30ecorE14.b1
D070803.2SGP/CO2FLX/C1 - Disturbance around sitesgp30co2flx25mC1.b1, sgp30co2flx4mC1.b1, sgp30co2flx4mmetC1.b1, sgp30co2flx60mC1.b1
D070918.3SGP/CO2FLX/C1 - Farm operationsgp30co2flx4mmetC1.b1
D071011.2SGP/CO2FLX/C1 - Reprocess: 4m instruments heightsgp30co2flx4mC1.b1
D080604.2SGP/ECOR/E14 - Sensor failuresgp30ecorE14.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 : D040217.3
Start DateStart TimeEnd DateEnd Time
12/18/2002000012/18/20030000
Subject:
SGP/CO2FLX/C1 - Reprocessing User Notes
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:sgp30co2flx4mmetC1.b1:
  • downwelling shortwave hemispheric irradiance t_rad corrected(r_down_short_hemisp)
  • upwelling longwave hemispheric irradiance t_rad corrected(r_up_long_hemisp)
  • upwelling shortwave hemispheric irradiance t_rad corrected(r_up_short_hemisp)
  • downwelling longwave hemispheric irradiance t_rad corrected(r_down_long_hemisp)


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DQRID : D040505.5
Start DateStart TimeEnd DateEnd Time
12/18/2003000004/28/20041900
Subject:
SGP/CO2FLX/C1 - Longwave Radiation Incorrect
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:sgp30co2flx4mmetC1.b1:
  • radiometer body temperature (for longwave correction)(t_rad)
  • upwelling longwave hemispheric irradiance t_rad corrected(r_up_long_hemisp)
  • downwelling longwave hemispheric irradiance t_rad corrected(r_down_long_hemisp)


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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 : 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 : D050316.1
Start DateStart TimeEnd DateEnd Time
12/18/2002000003/15/20052359
Subject:
SGP/CO2FLX/C1 - Reprocessed: User Notes
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:sgp30co2flx4mmetC1.b1:
  • photosynthetic photon flux density (PAR)(ppfd_up)
  • total downwelling shortwave radiation (LI-200 sensor)(r_tot)


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DQRID : D051031.3
Start DateStart TimeEnd DateEnd Time
08/25/2005000008/29/20050230
Subject:
SGP/ECOR/E14 - CO2/H2O Incorrect
DataStreams:sgp30ecorE14.b1
Description:
The LI-7500 CO2/H2O sensor stopped working after a rainstorm.  CO2 and H2O data are 
incorrect during the stated period.
Measurements:sgp30ecorE14.b1:
  • skewness of variable q(skew_q)
  • rotated covariance uq(cvar_rot_uq)
  • mean value of out of range values and spikes of c -9999 if no spikes(mean_spk_c)
  • covariance of qc(cvar_qc)
  • number of c samples removed due to spikes(n_spk_c)
  • rotated covariance wq(cvar_rot_wq)
  • covariance uq(cvar_uq)
  • rotated covariance uc(cvar_rot_uc)
  • number of valid q samples(n_good_q)
  • number of samples with \IRGA hardware problem\ flag(n_bad_irga)
  • 0=real or 1=dummy value of lv(real_lv)
  • average temperature (IGRA internal sensor)(temp_irga)
  • rotated covariance vc(cvar_rot_vc)
  • number of bad or out of range c samples(n_bad_c)
  • mean value of out of range values and spikes of q -9999 if no spikes(mean_spk_q)
  • variance of q(var_q)
  • number of samples with IRGA optical path blocked flag(n_bad_irga_light)
  • variance of c(var_c)
  • rotated covariance wc(cvar_rot_wc)
  • covariance uc(cvar_uc)
  • covariance of tq(cvar_tq)
  • number of q samples removed due to spikes(n_spk_q)
  • Water vapor density (q)(mean_q)
  • kurtosis of variable c(kurt_c)
  • covariance of tc(cvar_tc)
  • covariance vc(cvar_vc)
  • covariance wq(cvar_wq)
  • number of valid c samples(n_good_c)
  • skewness of variable c(skew_c)
  • latent heat flux(lv_e)
  • mean co2 concentration (c)(mean_c)
  • CO2 flux(fc)
  • rotated covariance vq(cvar_rot_vq)
  • covariance wc(cvar_wc)
  • number of bad or out of range q samples(n_bad_q)
  • kurtosis of variable q(kurt_q)
  • covariance vq(cvar_vq)


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DQRID : D051116.2
Start DateStart TimeEnd DateEnd Time
04/28/2004190011/16/20050000
Subject:
SGP/CO2FLX/C1 - downwelling longwave hemispheric irradiance incorrect
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:sgp30co2flx4mmetC1.b1:
  • downwelling longwave hemispheric irradiance t_rad corrected(r_down_long_hemisp)


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DQRID : D051116.3
Start DateStart TimeEnd DateEnd Time
12/18/2002000011/16/20050000
Subject:
SGP/CO2FLX/C1 - Soil Temperature measurements
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:sgp30co2flx4mmetC1.b1:
  • average of two lower soil temperature sensors(mean_t_soil_lower)
  • average of two middle soil temperature sensors(mean_t_soil_middle)
  • average of two upper soil temperature sensors(mean_t_soil_upper)


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DQRID : D051216.2
Start DateStart TimeEnd DateEnd Time
11/04/2005133011/17/20051630
12/01/2005193012/13/20051630
01/24/2006150002/13/20061930
05/05/2006210006/13/20061400
07/07/2006193007/14/20061500
Subject:
SGP/ECOR/E14 - Flux Measurements Incorrect
DataStreams:sgp30ecorE14.b1
Description:
The ECOR datastream was corrupted; this happens when the ECOR program produces a 
datastream of the wrong length (i.e., leaves one or more measurements out).

Fluxes and some other measurements are incorrect.

Reprocessing will not correct this problem; the raw data are corrupted.
Measurements:sgp30ecorE14.b1:
  • mean co2 concentration (c)(mean_c)
  • CO2 flux(fc)
  • Water vapor density (q)(mean_q)
  • average temperature (IGRA internal sensor)(temp_irga)
  • average atmospheric pressure (IGRA internal sensor)(atm_pres)
  • h(h)
  • latent heat flux(lv_e)


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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 : D060510.1
Start DateStart TimeEnd DateEnd Time
04/11/2006153004/19/20061500
Subject:
SGP/CO2FLX/C1 - Met stand was moved
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:sgp30co2flx4mmetC1.b1:
  • average of two lower soil temperature sensors(mean_t_soil_lower)
  • average of four upper soil moisture sensors(mean_m_soil_upper)
  • Unit Vector Wind Direction(wdir)
  • average of four lower soil moisture sensors(mean_m_soil_lower)
  • average of two middle soil temperature sensors(mean_t_soil_middle)
  • average of up to four soil heat flux sensors(mean_g_soil)
  • average of two upper soil temperature sensors(mean_t_soil_upper)


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DQRID : D070223.1
Start DateStart TimeEnd DateEnd Time
01/14/2007050002/02/20071600
Subject:
SGP/ECOR/E14 - Fluxes and Most Measurements Incorrect
DataStreams:sgp30ecorE14.b1
Description:
The ECOR system was having major problems during this period and most measurements were 
incorrect most of the time.
Measurements:sgp30ecorE14.b1:
  • 0=real or 1=dummy value of rho(real_rho)
  • vw covariance(cvar_vw)
  • lat(lat)
  • skewness of variable v(skew_v)
  • number of bad or out of range u samples(n_bad_u)
  • 0=real or 1=dummy value of lv(real_lv)
  • average temperature (IGRA internal sensor)(temp_irga)
  • rotated covariance vc(cvar_rot_vc)
  • mean value of out of range values and spikes of q -9999 if no spikes(mean_spk_q)
  • h(h)
  • number of w samples removed due to spikes(n_spk_w)
  • Down-boom wind velocity (u)(mean_u)
  • mixing ratio(mr)
  • wT covariance(cvar_wt)
  • 0=real or 1=dummy value of mr(real_mr)
  • covariance wq(cvar_wq)
  • Vertical angle of wind(phi)
  • variance of u(var_rot_u)
  • latent heat flux(lv_e)
  • number of bad or out of range q samples(n_bad_q)
  • number of v samples removed due to spikes(n_spk_v)
  • condensation pressure(cp)
  • standard deviation of wind direction(std_wind_dir)
  • covariance vq(cvar_vq)
  • number of valid w samples(n_good_w)
  • number of t samples removed due to spikes(n_spk_t)
  • skewness of variable q(skew_q)
  • Friction velocity(ustar)
  • covariance uv(cvar_uv)
  • covariance of qc(cvar_qc)
  • rotated covariance wq(cvar_rot_wq)
  • base time(base_time)
  • covariance uq(cvar_uq)
  • number of valid v samples(n_good_v)
  • standard deviation of wind elevation angle(std_elev)
  • rotated covariance uc(cvar_rot_uc)
  • number of bad or out of range c samples(n_bad_c)
  • mean value of out of range values and spikes of t -9999 if no spikes(mean_spk_t)
  • variance of c(var_c)
  • uw covariance(cvar_uw)
  • rotated covariance wt(cvar_rot_wt)
  • rotated covariance wc(cvar_rot_wc)
  • covariance uc(cvar_uc)
  • rotated covariance uv(cvar_rot_uv)
  • number of bad or out of range w samples(n_bad_w)
  • average atmospheric pressure (IGRA internal sensor)(atm_pres)
  • number of valid c samples(n_good_c)
  • number of bad or out of range v samples(n_bad_v)
  • CO2 flux(fc)
  • number of valid u samples(n_good_u)
  • covariance wc(cvar_wc)
  • variance of w(var_rot_w)
  • Retrieved water vapor density profile(rho)
  • Virtual temperature (T)(mean_t)
  • rotated covariance uw(cvar_rot_uw)
  • covariance ut(cvar_ut)
  • Vertical wind velocity (w)(mean_w)
  • variance of v(var_rot_v)
  • vector averaged wind direction(wind_dir)
  • rotated covariance uq(cvar_rot_uq)
  • number of c samples removed due to spikes(n_spk_c)
  • Cross-boom wind velocity (v)(mean_v)
  • number of samples with \IRGA hardware problem\ flag(n_bad_irga)
  • rotated mean w(mean_rot_w)
  • kurtosis of variable t(kurt_t)
  • kurtosis of variable u(kurt_u)
  • number of samples with IRGA optical path blocked flag(n_bad_irga_light)
  • kurtosis of variable v(kurt_v)
  • rotated covariance vw(cvar_rot_vw)
  • covariance of tc(cvar_tc)
  • covariance vc(cvar_vc)
  • skewness of variable w(skew_w)
  • 0=real or 1=dummy value of cp(real_cp)
  • mean co2 concentration (c)(mean_c)
  • rotated covariance vq(cvar_rot_vq)
  • kurtosis of variable w(kurt_w)
  • time(time)
  • number of bad or out of range t samples(n_bad_t)
  • momentum flux (dynamic)(k)
  • mean value of \spike\ w samples(mean_spk_w)
  • number of valid t samples(n_good_t)
  • rotated mean v(mean_rot_v)
  • number of u samples removed due to spikes(n_spk_u)
  • mean value of out of range values and spikes of c -9999 if no spikes(mean_spk_c)
  • number of valid q samples(n_good_q)
  • vector averaged wind speed(wind_spd)
  • average voltage of IRGA cooler(mean_cooler)
  • Dummy altitude for Zeb(alt)
  • variance of q(var_q)
  • Time offset of tweaks from base_time(time_offset)
  • skewness of variable t(skew_t)
  • variance of variable w(var_w)
  • skewness of variable u(skew_u)
  • mean horizontal wind speed(mean_rot_u)
  • covariance of tq(cvar_tq)
  • number of q samples removed due to spikes(n_spk_q)
  • Water vapor density (q)(mean_q)
  • kurtosis of variable c(kurt_c)
  • variance of variable v(var_v)
  • mean value of \spike\ u samples(mean_spk_u)
  • lon(lon)
  • rotated covariance ut(cvar_rot_ut)
  • variance of t(var_t)
  • skewness of variable c(skew_c)
  • latent heat of vaporization(lv)
  • variance of variable u(var_u)
  • number of samples with bad sonic status flag(n_bad_son_ic)
  • rotated covariance vt(cvar_rot_vt)
  • vertical (elevation) wind angle(elev)
  • kurtosis of variable q(kurt_q)
  • covariance vt(cvar_vt)
  • mean value of \spike\ v samples(mean_spk_v)


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DQRID : D070416.4
Start DateStart TimeEnd DateEnd Time
04/28/2004000004/02/20071930
Subject:
SGP/CO2FLX/C1 - downwelling longwave hemispheric irradiance incorrect
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:sgp30co2flx4mmetC1.b1:
  • downwelling longwave hemispheric irradiance t_rad corrected(r_down_long_hemisp)


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DQRID : D070514.2
Start DateStart TimeEnd DateEnd Time
05/09/2007130005/19/20071700
Subject:
SGP/ECOR/E14 - IRGA Temperature Incorrect or Missing
DataStreams:sgp30ecorE14.b1
Description:
The temp_irga was too large 05/09/07 1300 GMT - 05/10/07 2000 GMT.

The temp_irga was flat lined at 49.96 C 05/10/07 2030 GMT - 05/17/07 2000 GMT.  

The temp_irga was missing 05/17/07 2030 GMT - 05/19/07 1700 GMT.
Measurements:sgp30ecorE14.b1:
  • average temperature (IGRA internal sensor)(temp_irga)


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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:sgp30co2flx60mC1.b1:
  • mean co2 concentration (c)(mean_c)
  • WPL corrected CO2 flux(fc_corr)

sgp30co2flx4mC1.b1:
  • WPL corrected CO2 flux(fc_corr)
  • mean co2 concentration (c)(mean_c)

sgp30co2flx25mC1.b1:
  • mean co2 concentration (c)(mean_c)
  • WPL corrected CO2 flux(fc_corr)

sgp30co2flx4mmetC1.b1:
  • WPL corrected CO2 flux(fc_corr)
  • mean co2 concentration (c)(mean_c)


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DQRID : D070918.3
Start DateStart TimeEnd DateEnd Time
08/22/2007183009/07/20071800
Subject:
SGP/CO2FLX/C1 - Farm operation
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:sgp30co2flx4mmetC1.b1:
  • average of two lower soil temperature sensors(mean_t_soil_lower)
  • standard error of mean_t_soil_upper note maximum of two values used in
    calculation(stderr_mean_t_soil_upper)
  • photosynthetic photon flux density (PAR)(ppfd_up)
  • 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)
  • upwelling shortwave hemispheric irradiance t_rad corrected(r_up_short_hemisp)
  • standard error of mean_m_soil_upper(stderr_mean_m_soil_upper)
  • average of four upper soil moisture sensors(mean_m_soil_upper)
  • standard error of mean_t_soil_lower note maximum of two values used in
    calculation(stderr_mean_t_soil_lower)
  • average of up to four soil heat flux sensors(mean_g_soil)
  • upwelling longwave hemispheric irradiance t_rad corrected(r_up_long_hemisp)
  • average of two upper soil temperature sensors(mean_t_soil_upper)
  • standard error of mean_m_soil_lower(stderr_mean_m_soil_lower)
  • standard error of mean_g_soil(stderr_mean_g_soil)


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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 : D080604.2
Start DateStart TimeEnd DateEnd Time
04/02/2008133006/05/20081930
Subject:
SGP/ECOR/E14 - Sensor failure
DataStreams:sgp30ecorE14.b1
Description:
The water vapor output of the LI-7500 was too low, indicating that water vapor leaked into 
the sensor and that the chemicals are spent or there was an electronic failure.

Latent heat flux was not normally affected by this problem.
Measurements:sgp30ecorE14.b1:
  • Water vapor density (q)(mean_q)


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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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