| Subject: | SGP/SIRS/E8 - Ventilator Fan Failure |
| DataStreams: | sgpsirs20sE8.a0, sgpsirsE8.00, sgpsirsE8.b1
|
| Description: | At the start time specified the PSP (down_short_hemisp) ventilator fan failed. PM replaced
the fan 7/8/2008 1750. Ventilator failure does adversely affect radiometer measurements
but the extent has not been quantified. Mentor suggests using component sum method
detailed in SIRS instrument handbook where down_short_hemisp = down_short_diffuse +
short_direct_normal * cos (zenith angle) for each time record. |
| Measurements: | sgpsirsE8.00: - null(Raw data stream - documentation not supported)
sgpsirs20sE8.a0: - Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
Voltage(inst_global)
sgpsirsE8.b1: - Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
- Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
- Down-welling unshaded pyranometer voltage(down_short_hemisp)
- Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
Deviation(down_short_hemisp_std)
|
| Subject: | SGP/SIRS/E5 - Incorrect Calibration Coefficient |
| DataStreams: | sgpsirs20sE5.a0, sgpsirsE5.00, sgpsirsE5.b1
|
| Description: | When instruments were changed out on 6/25 the UIR (up_long_hemisp measurement) S/N and cal
coefficient reverted to a previous UIR instrument that was damaged and removed on
12/28/2007. The UIR S/N should be 31637F3 with corresponding cal K=.2526 instead of applied
value of K=.2571.
However, for the PIR longwave instrument in this inverted position (UIR) the K1 term
contributes approximately 0-7% of the total upwelling longwave signal throughout the day, or
about 0-30 W/m2. The cal coefficient is too high by approximately 2%. Thus, the UIR data,
as is, ranges from 0 to .6 W/m2 too low since this term is always negative. The
uncertainty of this instrument is approximately +-10 W/m2 with respect to the WSIG. Reprocessing
is not recommended. |
| Measurements: | sgpsirsE5.b1: - Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Maxima(up_long_hemisp_max)
- Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Standard
Deviation(up_long_hemisp_std) - Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
- Upwelling Longwave Hemispheric Net Infrared(up_long_netir)
- Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Minima(up_long_hemisp_min)
sgpsirs20sE5.a0: - Instantaneous Upwelling Pyrgeometer Thermopile(inst_up_long_hemisp_tp)
- Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer(inst_up_long_dome_resist)
- Instantaneous Upwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer(inst_up_long_case_resist)
sgpsirsE5.00: - null(Raw data stream - documentation not supported)
|