SGP/SIRS/E16 - PSP Dome Contamination
Downwelling Shortwave (DS) values near 22:00 GMT during clear skys are lower than expected due to contamination of pyranometer dome. A dime-sized spot of dirt was found on the southwest portion of the pyranometer dome. DS values for cloudy conditions during this period are also suspect, but the amount of irradiance reduction are not significant.
DS data for cloudy conditions should be acceptable (i.e., within estimated measurement uncertainties).