SGP/ECOR/E16 - Data suspect due to inability to run QC

Some QC checks were unsuccessful due to a communication failure that resulted in 
contaminated QC field data.

All the data that are based on water vapor density and CO2 concentration are "suspect" 
because many of the standard QC checks were not employed.

• null(Raw data stream - documentation not supported)

• 0=real or 1=dummy value of mr(real_mr)
• number of samples with IRGA optical path blocked flag(n_bad_irga_light)
• covariance vc(cvar_vc)
• mean value of out of range values and spikes of c -9999 if no spikes(mean_spk_c)
• kurtosis of variable q(kurt_q)
• latent heat flux(lv_e)
• skewness of variable q(skew_q)
• rotated covariance vc(cvar_rot_vc)
• covariance uq(cvar_uq)
• variance of c(var_c)
• number of c samples removed due to spikes(n_spk_c)
• 0=real or 1=dummy value of cp(real_cp)
• rotated covariance vq(cvar_rot_vq)
• mean co2 concentration (c)(mean_c)
• mean value of out of range values and spikes of q -9999 if no spikes(mean_spk_q)
• CO2 flux(fc)
• average atmospheric pressure (IGRA internal sensor)(atm_pres)
• latent heat of vaporization(lv)
• covariance of qc(cvar_qc)
• covariance wq(cvar_wq)
• kurtosis of variable c(kurt_c)
• variance of q(var_q)
• covariance wc(cvar_wc)
• covariance uc(cvar_uc)
• rotated covariance uq(cvar_rot_uq)
• number of valid q samples(n_good_q)
• condensation pressure(cp)
• number of valid c samples(n_good_c)
• 0=real or 1=dummy value of lv(real_lv)
• number of q samples removed due to spikes(n_spk_q)
• number of samples with \IRGA hardware problem\ flag(n_bad_irga)
• average temperature (IGRA internal sensor)(temp_irga)
• 0=real or 1=dummy value of rho(real_rho)
• number of bad or out of range q samples(n_bad_q)
• mixing ratio(mr)
• number of bad or out of range c samples(n_bad_c)
• rotated covariance wc(cvar_rot_wc)
• rotated covariance uc(cvar_rot_uc)
• covariance of tq(cvar_tq)
• rotated covariance wq(cvar_rot_wq)
• Retrieved water vapor density profile(rho)
• covariance of tc(cvar_tc)
• covariance vq(cvar_vq)
• average voltage of IRGA cooler(mean_cooler)
• skewness of variable c(skew_c)
• Water vapor density (q)(mean_q)

SGP/ECOR/E16 - Failed IRGA

The infrared gas analyzer (IRGA) failed on Nov. 2, 2004, 02:00; the system continued to 
operate without H2O and CO2 data until Nov. 9, 2004, 15:30; then it stopped due to another 
hardware failure. The system was returned to service on Nov. 12, 2004, 18:00.

The latent heat flux and CO2 flux data are irrevocably lost for the period from Nov. 2, 
2004, 02:00 to Nov. 12, 2004, 18:00.

• 0=real or 1=dummy value of mr(real_mr)
• number of samples with IRGA optical path blocked flag(n_bad_irga_light)
• covariance vc(cvar_vc)
• mean value of out of range values and spikes of c -9999 if no spikes(mean_spk_c)
• kurtosis of variable q(kurt_q)
• latent heat flux(lv_e)
• skewness of variable q(skew_q)
• rotated covariance vc(cvar_rot_vc)
• covariance uq(cvar_uq)
• variance of c(var_c)
• number of c samples removed due to spikes(n_spk_c)
• 0=real or 1=dummy value of cp(real_cp)
• rotated covariance vq(cvar_rot_vq)
• mean co2 concentration (c)(mean_c)
• mean value of out of range values and spikes of q -9999 if no spikes(mean_spk_q)
• CO2 flux(fc)
• average atmospheric pressure (IGRA internal sensor)(atm_pres)
• latent heat of vaporization(lv)
• covariance of qc(cvar_qc)
• covariance wq(cvar_wq)
• kurtosis of variable c(kurt_c)
• variance of q(var_q)
• covariance wc(cvar_wc)
• covariance uc(cvar_uc)
• rotated covariance uq(cvar_rot_uq)
• number of valid q samples(n_good_q)
• condensation pressure(cp)
• number of valid c samples(n_good_c)
• 0=real or 1=dummy value of lv(real_lv)
• number of q samples removed due to spikes(n_spk_q)
• number of samples with \IRGA hardware problem\ flag(n_bad_irga)
• average temperature (IGRA internal sensor)(temp_irga)
• 0=real or 1=dummy value of rho(real_rho)
• number of bad or out of range q samples(n_bad_q)
• mixing ratio(mr)
• number of bad or out of range c samples(n_bad_c)
• rotated covariance wc(cvar_rot_wc)
• rotated covariance uc(cvar_rot_uc)
• covariance of tq(cvar_tq)
• rotated covariance wq(cvar_rot_wq)
• Retrieved water vapor density profile(rho)
• covariance of tc(cvar_tc)
• covariance vq(cvar_vq)
• average voltage of IRGA cooler(mean_cooler)
• skewness of variable c(skew_c)
• Water vapor density (q)(mean_q)

SGP/ECOR/E16 - Missing data

Data are missing and unrecoverable.

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

SGP/ECOR/E16  - Reprocess: Incorrectly flagged (marked as "bad") H2O/CO2 data

Due to system clock instability on ECOR computers their system time is adjusted 
approximately once per hour; sometimes this adjustment leads to backward time jumps over midnight, 
into the previous day. In this case all the data based on CO2/H2O measurements might be 
erroneously marked as bad. Below is a list of times when that might have happen. 

SITE    YEAR    MONTH   DAY     HOUR    MINUTE
16      2004    02      23      00      00
16      2004    02      28      00      00
16      2004    03      01      00      00
16      2004    03      09      00      00
16      2004    03      15      00      00
16      2004    03      17      00      00
16      2004    03      22      00      00
16      2004    03      30      00      00
16      2004    04      02      00      00
16      2004    07      22      00      00
16      2004    08      06      00      00
16      2004    09      05      00      00
16      2004    09      20      00      00
16      2005    03      13      00      00

• 0=real or 1=dummy value of mr(real_mr)
• covariance vc(cvar_vc)
• mean value of out of range values and spikes of c -9999 if no spikes(mean_spk_c)
• latent heat flux(lv_e)
• skewness of variable q(skew_q)
• rotated covariance vc(cvar_rot_vc)
• covariance uq(cvar_uq)
• variance of c(var_c)
• number of c samples removed due to spikes(n_spk_c)
• 0=real or 1=dummy value of cp(real_cp)
• rotated covariance vq(cvar_rot_vq)
• mean co2 concentration (c)(mean_c)
• mean value of out of range values and spikes of q -9999 if no spikes(mean_spk_q)
• CO2 flux(fc)
• covariance of qc(cvar_qc)
• latent heat of vaporization(lv)
• covariance wq(cvar_wq)
• variance of q(var_q)
• covariance wc(cvar_wc)
• covariance uc(cvar_uc)
• number of valid q samples(n_good_q)
• condensation pressure(cp)
• number of valid c samples(n_good_c)
• 0=real or 1=dummy value of lv(real_lv)
• number of q samples removed due to spikes(n_spk_q)
• 0=real or 1=dummy value of rho(real_rho)
• number of bad or out of range q samples(n_bad_q)
• mixing ratio(mr)
• number of bad or out of range c samples(n_bad_c)
• rotated covariance wc(cvar_rot_wc)
• rotated covariance uc(cvar_rot_uc)
• covariance of tq(cvar_tq)
• rotated covariance wq(cvar_rot_wq)
• Retrieved water vapor density profile(rho)
• covariance of tc(cvar_tc)
• covariance vq(cvar_vq)
• skewness of variable c(skew_c)
• Water vapor density (q)(mean_q)

SGP/ECOR/E16 - Flux Measurements Incorrect

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.

• latent heat flux(lv_e)
• h(h)
• average temperature (IGRA internal sensor)(temp_irga)
• mean co2 concentration (c)(mean_c)
• CO2 flux(fc)
• Water vapor density (q)(mean_q)
• average atmospheric pressure (IGRA internal sensor)(atm_pres)

SGP/ECOR/E16 - LI-7500 Pressure and Temperature missing

The pressure and temperature measurements were not recorded; the LI-7500 serial datastream 
was not being captured by the ECOR system because of a serial port failure.

Some degradation of the latent and sensible heat fluxes may have occurred during high 
summer temperatures.  The error in the fluxes would be no more than 5 to 10% of the 
measurement, still well within the measurement error of the system.

• latent heat flux(lv_e)
• h(h)
• condensation pressure(cp)
• average temperature (IGRA internal sensor)(temp_irga)
• Retrieved water vapor density profile(rho)
• average atmospheric pressure (IGRA internal sensor)(atm_pres)
• latent heat of vaporization(lv)

SGP/ECOR/E16 - Latent Heat and CO2 Fluxes Incorrect

The LI-7500 CO2/H2O water vapor sensor was removed during this period.

• covariance vc(cvar_vc)
• mean value of out of range values and spikes of c -9999 if no spikes(mean_spk_c)
• kurtosis of variable q(kurt_q)
• latent heat flux(lv_e)
• skewness of variable q(skew_q)
• rotated covariance vc(cvar_rot_vc)
• covariance uq(cvar_uq)
• variance of c(var_c)
• number of c samples removed due to spikes(n_spk_c)
• 0=real or 1=dummy value of cp(real_cp)
• rotated covariance vq(cvar_rot_vq)
• mean co2 concentration (c)(mean_c)
• mean value of out of range values and spikes of q -9999 if no spikes(mean_spk_q)
• CO2 flux(fc)
• covariance of qc(cvar_qc)
• covariance wq(cvar_wq)
• kurtosis of variable c(kurt_c)
• variance of q(var_q)
• covariance wc(cvar_wc)
• covariance uc(cvar_uc)
• rotated covariance uq(cvar_rot_uq)
• number of valid q samples(n_good_q)
• condensation pressure(cp)
• number of valid c samples(n_good_c)
• number of q samples removed due to spikes(n_spk_q)
• 0=real or 1=dummy value of rho(real_rho)
• number of bad or out of range q samples(n_bad_q)
• number of bad or out of range c samples(n_bad_c)
• rotated covariance wc(cvar_rot_wc)
• rotated covariance uc(cvar_rot_uc)
• covariance of tq(cvar_tq)
• rotated covariance wq(cvar_rot_wq)
• Retrieved water vapor density profile(rho)
• covariance of tc(cvar_tc)
• covariance vq(cvar_vq)
• skewness of variable c(skew_c)
• Water vapor density (q)(mean_q)