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.

• Raw data stream - documentation not supported

• real_mr
• n_bad_irga_light
• covaraince vc(cvar_vc)
• mean_spk_c
• kurt_q
• Latent heat flux(lv_e)
• skew_q
• rotated covariance vc(cvar_rot_vc)
• covariance uq(cvar_uq)
• variance of variable c(var_c)
• n_spk_c
• real_cp
• rotated covariance vq(cvar_rot_vq)
• Mean CO2 density(mean_c)
• mean_spk_q
• CO2 flux(fc)
• atm_pres
• lv
• covariance qc(cvar_qc)
• covaraince wq(cvar_wq)
• kurt_c
• variance of variable q(var_q)
• covariance wc(cvar_wc)
• covariance uc(cvar_uc)
• rotated covariance uq(cvar_rot_uq)
• n_good_q
• Pressure, condensation, at altitude, RUC model output(cp)
• n_good_c
• real_lv
• n_spk_q
• n_bad_irga
• temp_irga
• real_rho
• n_bad_q
• mr
• n_bad_c
• rotated covariance wc(cvar_rot_wc)
• rotated covariance uc(cvar_rot_uc)
• covariance tq(cvar_tq)
• rotated covariance wq(cvar_rot_wq)
• rho
• covariance tc(cvar_tc)
• covariance vq(cvar_vq)
• mean_cooler
• skew_c
• Mean H2O density(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.

• real_mr
• n_bad_irga_light
• covaraince vc(cvar_vc)
• mean_spk_c
• kurt_q
• Latent heat flux(lv_e)
• skew_q
• rotated covariance vc(cvar_rot_vc)
• covariance uq(cvar_uq)
• variance of variable c(var_c)
• n_spk_c
• real_cp
• rotated covariance vq(cvar_rot_vq)
• Mean CO2 density(mean_c)
• mean_spk_q
• CO2 flux(fc)
• atm_pres
• lv
• covariance qc(cvar_qc)
• covaraince wq(cvar_wq)
• kurt_c
• variance of variable q(var_q)
• covariance wc(cvar_wc)
• covariance uc(cvar_uc)
• rotated covariance uq(cvar_rot_uq)
• n_good_q
• Pressure, condensation, at altitude, RUC model output(cp)
• n_good_c
• real_lv
• n_spk_q
• n_bad_irga
• temp_irga
• real_rho
• n_bad_q
• mr
• n_bad_c
• rotated covariance wc(cvar_rot_wc)
• rotated covariance uc(cvar_rot_uc)
• covariance tq(cvar_tq)
• rotated covariance wq(cvar_rot_wq)
• rho
• covariance tc(cvar_tc)
• covariance vq(cvar_vq)
• mean_cooler
• skew_c
• Mean H2O density(mean_q)

SGP/ECOR/E16 - Missing data

Data are missing and unrecoverable.

• real_mr
• mean_rot_v
• Mean horizontal wind speed(mean_rot_u)
• mean_rot_w
• standard deviation of wind elevation angle(std_elev)
• friction velocity(ustar)
• kurt_u
• kurt_t
• kurt_w
• kurt_v
• alt
• Latent heat flux(lv_e)
• kurt_q
• lv
• kurt_c
• rotated covariance wt(cvar_rot_wt)
• real_lv
• lat
• mr
• Mean sonic temperature (t), i.e. virtual temperature(mean_t)
• rotated covariance wc(cvar_rot_wc)
• mean_u
• mean_v
• mean_w
• rotated covariance wq(cvar_rot_wq)
• covariance tc(cvar_tc)
• rho
• Mean H2O density(mean_q)
• phi
• rotated covariance vw(cvar_rot_vw)
• rotated covariance vt(cvar_rot_vt)
• skew_v
• skew_w
• skew_u
• skew_t
• skew_q
• rotated covariance vc(cvar_rot_vc)
• n_spk_c
• real_cp
• rotated covariance vq(cvar_rot_vq)
• CO2 flux(fc)
• covariance qc(cvar_qc)
• rotated covariance uw(cvar_rot_uw)
• Wind speed(wind_spd)
• rotated covariance uv(cvar_rot_uv)
• time
• rotated variance u(var_rot_u)
• rotated variance v(var_rot_v)
• rotated covariance ut(cvar_rot_ut)
• wind_dir
• n_good_q
• rotated covariance uq(cvar_rot_uq)
• n_spk_q
• n_good_c
• n_spk_t
• n_spk_v
• rotated variance w(var_rot_w)
• n_spk_u
• n_spk_w
• Corrected sensible heat flux(h)
• rotated covariance uc(cvar_rot_uc)
• Momentum flux (dynamic)(k)
• n_good_u
• n_good_t
• n_good_w
• n_good_v
• elev
• mean_spk_c
• covariance wt(cvar_wt)
• mean_spk_t
• mean_spk_u
• mean_spk_v
• mean_spk_w
• mean_spk_q
• covaraince wq(cvar_wq)
• covariance wc(cvar_wc)
• n_bad_t
• n_bad_u
• n_bad_v
• time_offset
• n_bad_w
• base_time
• n_bad_son_ic
• real_rho
• n_bad_q
• n_bad_c
• covariance vt(cvar_vt)
• covariance vw(cvar_vw)
• lon
• covariance vq(cvar_vq)
• skew_c
• n_bad_irga_light
• covaraince vc(cvar_vc)
• covariance uv(cvar_uv)
• covariance uw(cvar_uw)
• covariance uq(cvar_uq)
• covariance ut(cvar_ut)
• variance of variable c(var_c)
• Mean CO2 density(mean_c)
• atm_pres
• variance of variable q(var_q)
• covariance uc(cvar_uc)
• variance of variable t(var_t)
• variance of variable u(var_u)
• Pressure, condensation, at altitude, RUC model output(cp)
• variance of variable v(var_v)
• n_bad_irga
• temp_irga
• standard deviation of wind direction(std_wind_dir)
• covariance tq(cvar_tq)
• variance of variable w(var_w)
• 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

• real_mr
• covaraince vc(cvar_vc)
• mean_spk_c
• Latent heat flux(lv_e)
• skew_q
• rotated covariance vc(cvar_rot_vc)
• covariance uq(cvar_uq)
• variance of variable c(var_c)
• n_spk_c
• real_cp
• rotated covariance vq(cvar_rot_vq)
• Mean CO2 density(mean_c)
• mean_spk_q
• CO2 flux(fc)
• covariance qc(cvar_qc)
• lv
• covaraince wq(cvar_wq)
• variance of variable q(var_q)
• covariance wc(cvar_wc)
• covariance uc(cvar_uc)
• n_good_q
• Pressure, condensation, at altitude, RUC model output(cp)
• n_good_c
• real_lv
• n_spk_q
• real_rho
• n_bad_q
• mr
• n_bad_c
• rotated covariance wc(cvar_rot_wc)
• rotated covariance uc(cvar_rot_uc)
• covariance tq(cvar_tq)
• rotated covariance wq(cvar_rot_wq)
• rho
• covariance tc(cvar_tc)
• covariance vq(cvar_vq)
• skew_c
• Mean H2O density(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)
• Corrected sensible heat flux(h)
• temp_irga
• Mean CO2 density(mean_c)
• CO2 flux(fc)
• Mean H2O density(mean_q)
• 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)
• Corrected sensible heat flux(h)
• Pressure, condensation, at altitude, RUC model output(cp)
• temp_irga
• rho
• atm_pres
• lv

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

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

• covaraince vc(cvar_vc)
• mean_spk_c
• kurt_q
• Latent heat flux(lv_e)
• skew_q
• rotated covariance vc(cvar_rot_vc)
• covariance uq(cvar_uq)
• variance of variable c(var_c)
• n_spk_c
• real_cp
• rotated covariance vq(cvar_rot_vq)
• Mean CO2 density(mean_c)
• mean_spk_q
• CO2 flux(fc)
• covariance qc(cvar_qc)
• covaraince wq(cvar_wq)
• kurt_c
• variance of variable q(var_q)
• covariance wc(cvar_wc)
• covariance uc(cvar_uc)
• rotated covariance uq(cvar_rot_uq)
• n_good_q
• Pressure, condensation, at altitude, RUC model output(cp)
• n_good_c
• n_spk_q
• real_rho
• n_bad_q
• n_bad_c
• rotated covariance wc(cvar_rot_wc)
• rotated covariance uc(cvar_rot_uc)
• covariance tq(cvar_tq)
• rotated covariance wq(cvar_rot_wq)
• rho
• covariance tc(cvar_tc)
• covariance vq(cvar_vq)
• skew_c
• Mean H2O density(mean_q)