Description: | Data quality this month is OK. The noteable problems follow. Nighttime offsets in the
Downwelling pyranometer (DS) average about -4 W/m^2 for the month. There are moderate
inconsistencies between the Global (DS), Direct (NIP) and Diffuse (DD) components for
the 1st, 2nd, 4th, 5th, 6th, 7th, 10th, 11th, 12th, 13th, 14th, 18th and 19th in the
afternoon
and the 1st, 2nd, 4th, 5th, 7th, 13th, 25th and 29th in the early morning. In every case
the
DD and NIP are too high and the DS is too low. This could be caused by the use of a
constant pyranometer responsivity for all solar zenith angles, or the switchover from
probable factor in the error. It should also be noted that the calibration factors for the
PSP's have a
tolerance of plus or minus 5% and the NIP has a tolerance of plus or minus 3%. The DS
drops
below daytime empirical limits on the 3rd from 7:50 PM to 9:40 PM
GMT. This was most likely caused by the heavily overcast skies at the time. Visual and
automated QC of the longwave components resulted in no noteable problems. |
Measurements: | sgpsirsC1.a1: - alt
- Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Maxima(up_short_hemisp_max)
- Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
- Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Minima(up_short_hemisp_min)
- Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
- Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
- short_direct_normal_std
- base_time
- Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
- Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
- lon
- down_long_hemisp_max
- lat
- vBatt
- Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
- down_short_hemisp_std
- down_short_diffuse_hemisp_std
- Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
- Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
- time_offset
- down_long_hemisp_std
- Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
- down_long_hemisp_min
- up_short_hemisp_std
- up_long_hemisp_std
- Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
- Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)
- Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
- Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
sgpsirsC1.a0: - down_long_case_resist
- lon
- Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
- base_time
- Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
- Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
- Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
- Observed direct-beam normal solar irradiance(nip)
- down_long_dome_resist
- short_diffuse
- up_long_case_resist
- alt
- time_offset
- lat
- up_long_dome_resist
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