NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry

The output precision of the following variables was increased 20060929:

   alt	changed from 1m to 0.1m
   dp	changed from 0.1degC to 0.01degC
   pres changed from 0.1 hPa to 0.01 hPa
   RH	changed from 1%RH to 0.01%RH
   tdry changed from .1degC to 0.01degC

Note that the increase in precision does not necessarily imply an increase
in accuracy.  Users are cautioned to continue to use their best scientific
judgement when using these or any other data.

• Relative humidity inside the instrument enclosure(rh)
• Dry bulb temperature(tdry)
• Dummy altitude for Zeb(alt)
• Retrieved pressure profile(pres)
• Surface dew point temperature(dp)

NSA/SKYRAD/C1 - IRT mirror heater failure

The heater of the IRT gold mirror failed due to a broken wire (that probably occurred on 
12/13 during maintenance of the solar tracker) allowing snow and frost to accumulate on 
the mirror until it was cleared during daily preventative maintenance. The problem was 
corrected when the heater wires were replaced.

• Sky Infra Red Temperature Minima(sky_ir_temp_min)
• Sky Infra Red Temperature Maxima(sky_ir_temp_max)
• Standard Deviation of Sky Infra Red Temperature(sky_ir_temp_std)
• Sky Infra-Red Temperature(sky_ir_temp)

• Instantaneous Sky/Cloud Infrared(inst_sky_ir_signal)

NSA/SKYRAD/C1 - Direct and Diffuse incorrect

The short_direct_normal (NIP) instrument and cable were damaged by tracker rewind 
malfunction. Tracker and NIP replaced on 4/22 2200GMT but tracker not operational until 4/23 
1815GMT.  Thus, down_short_diffuse_hemisp (8-48) was not shaded 4/22 to 4/23.

Do not use 8-48 data from 4/22 to 4/23. NIP data is not recoverable during entire time but 
can be estimated using component sum for each 1 minute data: Direct = (global - 
diffuse)/cos(zenith angle)

• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Minima(down_short_diffuse_hemisp_min)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• Shortwave Direct Normal Irradiance, Pyrgeometer, Minima(short_direct_normal_min)
• Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
• Shortwave Direct Normal Irradiance, Pyrgeometer, Maxima(short_direct_normal_max)
• Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Maxima(down_short_diffuse_hemisp_max)
• Shortwave Direct Normal Irradiance, Pyrgeometer(short_direct_normal)

• Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
  Voltage(inst_direct_normal)
• Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
  Thermopile Voltage(inst_diffuse)

NSA/SKYRAD/C1 - Tracker inoperative

Tracker stopped working at this site during the time range specified. Reason for failure 
is unknown.  Tracker power cycled and restarted by maintenance 06/30 2008 1740 GMT.

The short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) data are bad during 
this time.  Data are not recoverable.

• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Minima(down_short_diffuse_hemisp_min)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Maxima(down_short_diffuse_hemisp_max)

• Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
  Voltage(inst_direct_normal)
• Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
  Thermopile Voltage(inst_diffuse)

NSA/TPS/C1 - Reprocess: Incorrect temporal resolution

The data were incorrectly collected and processed at 1 second temporal resolution rather 
than 1 minute resolution.  Data will be reprocessed to average to 1 minute.  Data quality 
are not compromised by this resolution error.

• Total daily accumulated liquid precipitation(precip_total)
• Precipitation rate(precip_rate)
• Mean Wind Speed(wspd)
• Air temperature(air_temp)
• Instrument enclosure temperature(enclosure_temp)

NSA/GNDRAD/C1 - Upwelling PIR ventilator fan failure

The PIR exhibited a positive bias of approximately 6 W/m2 compared to the upwelling IRT 
due to ventilator fan failure.  Thus, the up_long_hemisp, data stream is high by about 6 
W/m2.    
   
Bias is not consistent and depends on atmospheric conditions. Either disregard the 
up_long_hemisp data or use the IRT for an estimate of the up_long_hemisp values during this time 
period.

• Instantaneous Upwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer(inst_up_long_hemisp_case_resist)
• Instantaneous Upwelling Pyrgeometer Thermopile(inst_up_long_hemisp_tp)
• Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer(inst_up_long_hemisp_dome_resist)

• Instantaneous Upwelling Pyrgeometer Dome Thermistor Temperature(inst_up_long_hemisp_dome_temp)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Standard
  Deviation(up_long_hemisp_std)
• Instantaneous Upwelling Pyrgeometer Thermopile(inst_up_long_hemisp_tp)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Maxima(up_long_hemisp_max)
• Instantaneous Upwelling Pyrgeometer Case Thermistor Temperature(inst_up_long_hemisp_case_temp)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Minima(up_long_hemisp_min)

NSA/MET/C1 - Temp/RH/wind data questionable

New wind sensors and new T/RH probes were being installed during this time period.  The 
tower booms were lowered and much of the data collected were not at listed heights nor were 
the data accurate due to configurations during install.

• qc_wspd_arith_mean
• qc_rh_mean
• rh_mean
• wspd_arith_mean
• qc_vapor_pressure_mean
• vapor_pressure_mean
• dew_point_std
• wspd_vec_mean
• qc_wspd_vec_mean
• qc_wdir_vec_mean
• wdir_vec_mean
• rh_std
• Mean Air Temperature or Hardware Error(temp_mean)
• trh_err_code
• qc_temp_mean
• vapor_pressure_std
• wdir_vec_std
• temp_std
• qc_dew_point_mean
• dew_point_mean

• rh_mean
• qc_wdir_vec_mean
• Mean Air Temperature or Hardware Error(temp_mean)
• dew_point_std
• trh_err_code
• vapor_pressure_std
• qc_vapor_pressure_mean
• wdir_vec_std
• qc_rh_mean
• temp_std
• vapor_pressure_mean
• qc_wspd_vec_mean
• rh_std
• qc_temp_mean
• qc_wspd_arith_mean
• wspd_vec_mean
• wspd_arith_mean
• wdir_vec_mean
• qc_dew_point_mean
• dew_point_mean

NSA/MET/C1 - PWS data missing due to snow impaction

Blizzard conditions caused the optics to become impacted with snow and ice rendering the 
Present Weather Detector inoperative.

• pws_pw_code_1hr
• qc_pws_err_code
• qc_pws_pw_code_1hr
• pws_precip_rate_mean_1min
• pws_vis_mean_1min
• pws_pw_code_15min
• pws_err_code
• pws_pw_code_inst
• qc_pws_pw_code_inst
• pws_cumul_rain
• qc_pws_cumul_rain
• qc_pws_vis_mean_10min
• qc_pws_cumul_snow
• qc_pws_vis_mean_1min
• pws_cumul_snow
• pws_vis_mean_10min
• qc_pws_precip_rate_mean_1min
• qc_pws_pw_code_15min

NSA/MET/C1 - Wind data intermittent

There was a loose wire on the serial data multiplexer causing the wind data to become 
missing during high wind situations.  The high winds caused the enclosure to vibrate making 
the connection intermittent.

• qc_wspd_arith_mean
• wspd_arith_mean
• wdir_vec_std
• wspd_vec_mean
• qc_wspd_vec_mean
• wdir_vec_mean
• qc_wdir_vec_mean

• qc_wdir_vec_mean
• qc_wspd_arith_mean
• wspd_vec_mean
• wspd_arith_mean
• wdir_vec_mean
• wdir_vec_std
• qc_wspd_vec_mean

NSA/MET/C1 - CMH data missing

The data from the CMH was missing during these times due to a failing logic board.  The 
board was replaced.

• qc_cmh_dew_point
• qc_cmh_temp
• qc_cmh_sat_vapor_pressure
• qc_cmh_rh
• cmh_vapor_pressure
• cmh_sat_vapor_pressure
• cmh_temp
• cmh_rh
• qc_cmh_vapor_pressure
• cmh_dew_point