Data Quality Reports for Session: 102493 User: ddye Completed: 11/05/2006

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D040217.2SGP/CO2/C1 - Reprocessing User Notessgp30co2flx4mC1.b1, sgp30co2flx25mC1.b1, sgp30co2flx60mC1.b1, sgp30co2flx4mmetC1.b1
D040217.3SGP/CO2/C1 - Reprocessing User Notessgp30co2flx4mmetC1.b1
D050316.1SGP/CO2/C1 - Reprocessed: User Notessgp30co2flx4mmetC1.b1
D051116.3SGP/CO2/C1 - Soil Temperature measurementssgp30co2flx4mmetC1.b1


DQRID : D040217.2
Start DateStart TimeEnd DateEnd Time
12/18/2002000002/17/20040000
Subject:
SGP/CO2/C1 - Reprocessing User Notes
DataStreams:sgp30co2flx4mC1.b1, sgp30co2flx25mC1.b1, sgp30co2flx60mC1.b1, 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:sgp30co2flx60mC1.b1:
  • height of tower base from sea level(site_elevation)
  • corrected sensible heat flux(h)
  • latitude of instument location(site_latitude)
  • mean value of IRGA pressure(mean_p)
  • variance of variable c(var_c)
  • Date and time in alternate form(yyyydddhhmmss)
  • mean sonic temperature (t), i.e. virtual temperature(mean_t)
  • mean horizontal wind speed(mean_rot_u)
  • Time offset of tweaks from base_time(time_offset)
  • variance of variable q(var_q)
  • rotated variance v(var_rot_v)
  • fractional day of the year(doy)
  • Vertical angle of wind(phi)
  • rotated variance w(var_rot_w)
  • Monin-Obukhov length scale(Lmoni)
  • rotated variance 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)
  • Time offset from base_time(base_time)
  • rotation to zero w(theta)
  • longitude of instument location(site_longitude)
  • mean co2 concentration (c)(mean_c)
  • height of instument from tower base(zm)
  • variance of variable t(var_t)
  • WPL corrected CO2 flux(fc_corr)
  • mean water vapor concentration (q)(mean_q)
  • WPL corrected latent heat flux(le)
sgp30co2flx4mC1.b1:
  • mean value of IRGA pressure(mean_p)
  • variance of variable c(var_c)
  • variance of variable t(var_t)
  • WPL corrected latent heat flux(le)
  • mean horizontal wind speed(mean_rot_u)
  • Vertical angle of wind(phi)
  • Monin-Obukhov length scale(Lmoni)
  • variance of variable q(var_q)
  • height of instument from tower base(zm)
  • longitude of instument location(site_longitude)
  • additive WPL LE correction to c flux(fc_wpl_le)
  • mean sonic temperature (t), i.e. virtual temperature(mean_t)
  • mean water vapor concentration (q)(mean_q)
  • corrected sensible heat flux(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)
  • rotated variance w(var_rot_w)
  • Time offset from base_time(base_time)
  • rotated variance u(var_rot_u)
  • rotated variance v(var_rot_v)
  • rotation to zero w(theta)
  • WPL corrected CO2 flux(fc_corr)
  • latitude of instument location(site_latitude)
  • Time offset of tweaks from base_time(time_offset)
  • friction velocity(ustar)
  • height of tower base from sea level(site_elevation)
  • fractional day of the year(doy)
sgp30co2flx25mC1.b1:
  • Time offset from base_time(base_time)
  • Monin-Obukhov length scale(Lmoni)
  • WPL corrected latent heat flux(le)
  • variance of variable t(var_t)
  • rotated variance u(var_rot_u)
  • Date and time in alternate form(yyyydddhhmmss)
  • rotated variance v(var_rot_v)
  • Vertical angle of wind(phi)
  • Unit Vector Wind Direction(wdir)
  • longitude of instument location(site_longitude)
  • latitude of instument location(site_latitude)
  • WPL corrected CO2 flux(fc_corr)
  • height of instument from tower base(zm)
  • variance of variable q(var_q)
  • friction velocity(ustar)
  • variance of variable c(var_c)
  • additive WPL LE correction to c flux(fc_wpl_le)
  • mean value of IRGA pressure(mean_p)
  • rotated variance w(var_rot_w)
  • mean sonic temperature (t), i.e. virtual temperature(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 tower base from sea level(site_elevation)
  • corrected sensible heat flux(h)
  • additive WPL H correction to c flux(fc_wpl_h)
  • mean water vapor concentration (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)
  • corrected sensible heat flux(h)
  • additive WPL H correction to c flux(fc_wpl_h)
  • rotated variance v(var_rot_v)
  • precipitation accumulated between outputs, 3-hr accumulation(precip)
  • additive WPL LE correction to c flux(fc_wpl_le)
  • rotated variance 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)
  • mean water vapor concentration (q)(mean_q)
  • variance of variable 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 instument location(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)
  • mean sonic temperature (t), i.e. virtual temperature(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)
  • rotated variance w(var_rot_w)
  • WPL corrected latent heat flux(le)
  • mean value of IRGA pressure(mean_p)
  • downwelling shortwave hemispheric irradiance t_rad corrected(r_down_short_hemisp)
  • friction velocity(ustar)
  • Time offset from base_time(base_time)
  • height of upper RH/T sensor(z_upper)
  • height of tower base from sea level(site_elevation)
  • variance of variable q(var_q)
  • standard error of mean_g_soil(stderr_mean_g_soil)
  • radiometer body temperature (for longwave correction)(t_rad)
  • longitude of instument location(site_longitude)
  • variance of variable 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/CO2/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 : D050316.1
Start DateStart TimeEnd DateEnd Time
12/18/2002000003/15/20052359
Subject:
SGP/CO2/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 : D051116.3
Start DateStart TimeEnd DateEnd Time
12/18/2002000011/16/20050000
Subject:
SGP/CO2/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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