NSA/SKYRAD/C2 - wrong calibration coefficent for PIRd in ATQ

Due to confusion over ARM calibration policy, a revised calibration was installed
and was in place for the duration of the time period indicated.  When the error
was noted, the original calibration was re-installed.

Users may notice discontinuities in PIRd data at the time boundaries of this
DQR.

• Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)

• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
  Deviation(down_long_hemisp_shaded_std)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)

• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
  Deviation(down_long_hemisp_shaded_std)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

NSA/SKYRAD/C1 - PIR data suspect

PIR shaded and PIR unshaded show unusual differences during this time period, frosting or 
icing is the most probable explanation but we don't know for sure.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded standard deviation(pir1_sd)

NSA/SKYRAD/C1 - Shaded PIR data unreasonable

Scientificly unreasonable data values, the problem disappeared after the datalogger was 
exchanged with the spare. The data logger was exchanged on 11/7 at 20:10 GMT.

• PIR shaded maximum(pirs_max)
• PIR shaded standard deviation(pirs_sd)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)

• PIR shaded mean(pirs_mean)
• PIR shaded minimum(pirs_min)
• PIR shaded maximum(pirs_max)
• PIR shaded standard deviation(pirs_sd)

NSA/SKYRAD/C1 - PIR data suspect

PIR shaded and PIR unshaded show unusual differences during this time period, frosting or 
icing is one possible explanation but we don't know.

• PIR shaded standard deviation(pirs_sd)
• PIR1 unshaded maximum(pir1_max)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)
• PIR1 unshaded standard deviation(pir1_sd)
• PIR shaded maximum(pirs_max)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded maximum(pir1_max)
• PIR shaded mean(pirs_mean)
• PIR shaded maximum(pirs_max)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded mean(pir1_mean)
• PIR shaded minimum(pirs_min)
• PIR1 unshaded standard deviation(pir1_sd)
• PIR shaded standard deviation(pirs_sd)

NSA/SKYRAD/C1 - Unshaded PIR maintenance

Unreasonable data from 3/15 23:45 until 3/16 0:45 due to exchange of PIR instrument to the 
PIR spare (32054F3). This was done so the PIR could go to NOAA/CMDL in Boulder for 
calibration as part of the IPARSC II IOP and be included in this work.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded standard deviation(pir1_sd)

NSA/SKYRAD/C1 - Miscalibrated Unshaded PIR data

Calibration coefficient for PIR spare (32054F3) was updated on 3/25 2:35 GMT. The old PIR 
cal coefficient was used during this period. The PIR spare (32054F3) was calibrated by 
NOAA/CMDL in Boulder prior to the IOP and replacement on 3/16 when the original station PIR 
was shipped to Boulder for a post IOP calibration.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded standard deviation(pir1_sd)

NSA/SKYRAD/C1 - Noise in Unshaded PIR data

Noise increased and an offset from shaded PIR became apparent during this period.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded standard deviation(pir1_sd)

NSA/SKYRAD/C1 - NIP shaded by skyrad stand around local midnight

Around local midnight 9:30-10:30 GMT during summer clear sky the normal incidence 
pyranometer is shaded by the instrument stand.This causes the reading to be 0 W/m2. If cosine 
correction is applied for irradiance calulations this effect is negligible due to the low 
solar angle.

• NIP maximum(nip_max)
• NIP standard deviation(nip_sd)
• NIP minimum(nip_min)
• NIP mean(nip_mean)

• NIP maximum(nip_max)
• NIP standard deviation(nip_sd)
• NIP minimum(nip_min)
• NIP mean(nip_mean)

NSA/SKYRAD/C1 - PSP shaded by MFRSR after local midnight

Just past local midnight (11:00-11:40 GMT during summer clear sky) the global 
hemispherical pyranometer is shaded by the MFRSR instrument for about 40 minutes. This causes the 
reading to be 0 W/m2. This effect would be negligible in a daily average due to the low 
solar angle.

• PSP1 unshaded mean(psp1_mean)
• PSP1 unshaded minimum(psp1_min)
• PSP1 unshaded maximum(psp1_max)
• PSP1 unshaded standard deviation(psp1_sd)

• PSP1 unshaded maximum(psp1_max)
• PSP1 unshaded standard deviation(psp1_sd)
• PSP1 unshaded mean(psp1_mean)
• PSP1 unshaded minimum(psp1_min)

NSA/SKYRAD/C1 - IRT measurements during precipitation events

The IRT measurement of sky/cloud temperature was in question during precipitation events 
because rain or snow could accumulate in the upward-pointed lens barrel. This was 
corrected by reorienting the IRT to measure the sky temperature as reflected by a gold mirror.

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

NSA/SKYRAD/C1 - NSA B&W nighttime offset in Barrow too large

This problem only became apparent as NSA C1 nights became long enough for full darkness. 
The shaded global diffuse instrument (Eppley 8-48) showed a negative nighttime offset 
larger than the expected 0 to -4 W/m2. Typically -5 to -8 W/m2. This size of offset is not 
uncommon with Eppley PSPs but not observed with Eppley 8-48s.  The problem was corrected 
with replacement of mounting screws which were creating a ground loop.

• PSP shaded minimum(psps_min)
• PSP shaded maximum(psps_max)
• PSP shaded mean(psps_mean)
• PSP shaded standard deviation(psps_sd)
• 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 Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Maxima(down_short_diffuse_hemisp_max)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Standard Deviation(down_short_diffuse_hemisp_std)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Minima(down_short_diffuse_hemisp_min)
• PSP shaded maximum(psps_max)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Maxima(down_short_diffuse_hemisp_max)
• PSP shaded minimum(psps_min)
• PSP shaded mean(psps_mean)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• PSP shaded standard deviation(psps_sd)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Standard Deviation(down_short_diffuse_hemisp_std)