| Subject: | SGP/SIRS/C1 - Sensor Cable Problem |
| DataStreams: | sgpsirsC1.b1, sgpsirs20sC1.a0
|
| Description: | Beginning October 3, 2007, the upwelling longwave irradiance (up_long_hemisp, aka "UIR")
started to spike to unreasonable values positively offset from the co-located E13 by over
100W/m2. On January 17 2008 the UIR values become consistently bad due to bad UIR dome
thermistor wiring. Problem appears as a resistive offset in the dome thermistor but due
to nature of failure (unknown cable problem) data correction would not yield any better
data than the co-located E13 UIR instrument that is known to be operating correctly.
Instrument cable replacement on 4/22 fixed the problem.
Thermopile data (netIR) from this instrument is good. However, Incoming irradiance data
is not correctable due to bad UIR dome thermistor wiring within the instrument cable. |
| Measurements: | sgpsirs20sC1.a0: - inst_up_long_dome_resist
- inst_up_long_case_resist
- inst_up_long_hemisp_tp
sgpsirsC1.b1: - Upwelling Longwave Hemispheric Net Infrared(up_long_netir)
- Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)
- Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
- Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
- up_long_hemisp_std
|