SGP/BRS/C1 - Missing data due to Ice storm and clock problems

Data are missing due to power failures caused by an ice storm
and resulting system/instrument clock problems.

• Clear-sky Fit Estimated Downwelling Direct Shortwave Irradiance (cdir)(dirfluxdn_clearskyfit)
• difratiodn_measured
• time_offset
• time_offset_LST
• Clear-sky Fit Estimated Downwelling Global Shortwave Irradiance (cgsw)(gswfluxdn_clearskyfit)
• difratiodn_clearskyfit
• site
• guvbdn_clearskyfit
• Clear-sky Fit Estimated Sfc. Albedo from Shortwave Irrad. Measurements (calb)(albedosw_clearskyfit)
• sun_earth_distance
• base_time
• North latitude(lat)
• difratiodn_measured_stdev
• difswfluxdn_cloudeffect
• Irradiance, shortwave, downwelling, diffuse, measured(difswfluxdn_measured)
• nsamples_gswfluxdn_clearskyfit
• solar_cos_z
• gswfluxdn_cloudeffect
• base_time_LST
• difcloudeffect_normalized
• sswfluxdn_clearskyfit
• nsamples_cloudfraction
• Measured Downwelling Direct Shortwave Irradiance (dir)(dirfluxdn_measured)
• sswfluxdn_measured
• Measured Downwelling Global Shortwave Irradiance (gsw)(gswfluxdn_measured)
• sswfluxdn_cloudeffect
• Measured Surface Albedo from Shortwave Irradiance Measurements (alb)(albedosw_measured)
• Altitude above mean sea level(alt)
• guvbdn_measured
• nsamples_clearsky_detection
• East longitude(lon)
• nsamples_sswfluxdn_measured
• Fractional Sky Cover(cloudfraction)
• Clear-sky Fit Estimated Downwelling Diffuse Field Shortwave Irradiance (cdif)(difswfluxdn_clearskyfit)

SGP/BRS/C1 - SWFANAL Data description error

The long name attribute for the cloud effect fields incorrectly
defines the cloud effect to be the difference between the 
clearskyfit and measured values:
   
"Difference: ***fluxdn_clearskyfit - ***fluxdn_measured (***fcg)" ;
   
The cloud effects are correctly calculated by subtracting the
irradiance calculated in the clear sky fit from the measured 
irradiance.
   
"Difference: ***fluxdn_measured - ***fluxdn_clearskyfit (***fcg)" ;
   
NOTE: this is just a documentation error.  The data are correctly
calculated.

• sswfluxdn_cloudeffect
• difswfluxdn_cloudeffect
• gswfluxdn_cloudeffect

SGP/IRT/C1 - UPS failing

The IRT data were intermittently bad during this period due to a failing UPS. The problem 
was corrected by replacing the UPS.

• Surface Infra-Red Temperature, Maxima(sfc_ir_temp_max)
• internal_voltage
• Effective Surface (Skin) Temperature(sfc_ir_temp)
• sfc_ir_temp_std
• Surface Infra-Red Temperature, Minima(sfc_ir_temp_min)

SGP/IRT/C1 - Noisy 10m IRT data

The 10M IRT surface temperatures were very noisy because the connection to the data logger 
had become loose.

• Surface Infra-Red Temperature, Maxima(sfc_ir_temp_max)
• internal_voltage
• Effective Surface (Skin) Temperature(sfc_ir_temp)
• sfc_ir_temp_std
• Surface Infra-Red Temperature, Minima(sfc_ir_temp_min)
• logger_temp

SGP/IRT/C1 - Measurement range

The ground surface temperature exceeded the maximum measurement of 50C on some days. The 
maximum was increased to 60C for IRT10m on 10/1/2012 at 15:25 and for IRT25m on 10/9/2012 
at 21:45.

• Surface Infra-Red Temperature, Maxima(sfc_ir_temp_max)
• Effective Surface (Skin) Temperature(sfc_ir_temp)

SGP/IRT/C1 - 10m IRT ground surface temperature

The 10m IRT was measuring lower ground surface temperature than the 25m IRT. The lens was 
cleaned on 12/19/2012 and replaced on 2/8/2013 but the difference in temperature appears 
to be due to the seasonal difference in surface cover - tall grass vesus bare soil.

• Surface Infra-Red Temperature, Maxima(sfc_ir_temp_max)
• Effective Surface (Skin) Temperature(sfc_ir_temp)
• sfc_ir_temp_std
• Surface Infra-Red Temperature, Minima(sfc_ir_temp_min)

SGP/IRT/C1 - Noisy data

The power supplied to the data logger was very "noisy" causing the surface temperature 
measurements to also be "noisy".

• Surface Infra-Red Temperature, Maxima(sfc_ir_temp_max)
• internal_voltage
• Effective Surface (Skin) Temperature(sfc_ir_temp)
• sfc_ir_temp_std
• Surface Infra-Red Temperature, Minima(sfc_ir_temp_min)

SGP/IRT/C1 - Datalogger power

The datalogger lost power and was replaced.

• Altitude above mean sea level(alt)
• East longitude(lon)
• Surface Infra-Red Temperature, Maxima(sfc_ir_temp_max)
• internal_voltage
• North latitude(lat)
• time_offset
• Effective Surface (Skin) Temperature(sfc_ir_temp)
• sfc_ir_temp_std
• Surface Infra-Red Temperature, Minima(sfc_ir_temp_min)
• logger_temp
• base_time
• time

SGP Site Power Outage Due to Winter Storm

On Saturday and Sunday, December 26 and 27th a powerful winter storm (Goliath) brought 
sleet and freezing rain to much of Oklahoma with wind gusts of 45 MPH at times. The result 
was very very slick roads and mass power outages.
 
The SGP central facility lost power at 8:55 PM CDT on Sunday, December 27th.  
The power was restored on 7:56 PM CDT on Wednesday, December 30th
 
Site Emergency procedures were activated and Technicians drained water out of instrument 
reservoirs and other measures as needed, early Monday morning.
 
On Wednesdays as roads and power started was restored to much of the areas east of I-35 , 
Site Technicians performed maintenance on several Extended Facilities.

During this period, data are potentially missing, incorrect, or suspect.  Carefully 
inspect the data before use.

• Altitude above mean sea level(alt)
• internal_voltage
• Surface Infra-Red Temperature, Maxima(sfc_ir_temp_max)
• East longitude(lon)
• North latitude(lat)
• time_offset
• Surface Infra-Red Temperature, Minima(sfc_ir_temp_min)
• Effective Surface (Skin) Temperature(sfc_ir_temp)
• sfc_ir_temp_std
• base_time
• time
• logger_temp