SGP/SIRS/E33 - Instrument noise problem

The UIR instrument (up_long_hemisp) had significant noise starting from the commission 
date.  On 8/14/2012 15:59 the UIR was replaced which corrected the noise problem.

• inst_up_short_hemisp
• inst_up_long_case_resist
• inst_up_long_hemisp_tp
• inst_up_long_dome_resist

• Upwelling Longwave Hemispheric Net Infrared(up_long_netir)
• inst_up_long_case_temp
• Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
• inst_up_long_dome_temp
• up_long_hemisp_std
• Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

SGP/SIRS/E33 - Reprocessed: Incorrect LW calibration

During the time range specified the UIR and DIR serial numbers were correct but incorrect 
calibration coefficients were applied in the datalogger.  

up_long_hemisp (SN# 30058F3) 
  wrong k1 cal :0.2679 W/(m^2*uV)
  correct k1 cal: 0.2740 W/(m^2*uV)

down_long_hemisp (SN# 30085F3) 
  wrong k1 cal :0.2376 W/(m^2*uV)
  correct k1 cal: 0.2451 W/(m^2*uV)

Data reprocessing completed 20121217.

• Irradiance, longwave, downwelling, hemispheric, thermopile (Shaded Pyrgeometer1)(inst_down_long_hemisp_shaded_tp)
• inst_down_long_shaded_case_resist
• inst_up_long_dome_resist
• inst_down_long_shaded_dome_resist
• inst_up_long_case_resist
• inst_up_long_hemisp_tp

• inst_down_long_shaded_dome_temp
• Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
• Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
• inst_up_long_dome_temp
• Downwelling Longwave Hemispheric Irradiance, Shaded Ventilated Pyrgeometer(down_long_hemisp_shaded)
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• Upwelling Longwave Hemispheric Net Infrared(up_long_netir)
• down_long_hemisp_shaded_std
• Downwelling Longwave Hemispheric Irrad., Shaded Ventilated Pyrgeometer, Minima(down_long_hemisp_shaded_min)
• inst_up_long_case_temp
• Downwelling Longwave Hemispheric Irrad., Shaded Ventilated Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
• inst_down_long_shaded_case_temp
• up_long_hemisp_std
• Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)

SGP/SIRS/E33 - Reprocessed: Partial shading

Shading of the NIP radiometer occurred after sunrise each day of the reported date period, 
for a few minutes between 1145 and 1215 UTC. Issue was present in the shortwave direct 
normal variable as well as the associated min, max, and std variables. The shading was 
caused by the presence of a narrow antenna that was later relocated. 

The data have been reprocessed to set specific affected periods to the missing_value 
(-9999).  Specific times affected were:
    20120509: 1200-1201
    20120510: 1201-1202
    20120513: 1206-1207
    20120514: 1207-1208

• inst_direct_normal

• short_direct_normal_std
• Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
• Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)