Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
03/30/2005 | 0103 | 04/19/2005 | 1720 | Suspect |
Subject: | SGP/SIRS/E9 - Downwelling Shortwave values low |
DataStreams: | sgpsirs20sE9.a0, sgpsirsE9.b1, sgpsirsE9.00 |
Description: | Downwelling Shortwave Hemispheric (DSH) irradiance values from the pyranometer instrument were frequently below the MIN value of -10 W/m^2 at night. DSH values also frequently disagreed with derived readings (at times well over 50 W/m^2 difference) during the daylight hours, especially in the morning. Field techs performed maintenance but could not find obvious instrument or connection problems. The low DSH values during nighttime were on the threshold of acceptable. Largest offsets acceptable with these pyranometers is typically -10 W/m2. The large derived vs. actual DSH differences during the daylight hours are the subject of ongoing ARM investigation. No instrument problems could be identified. |
Suggestions: | Use data with caution. Refer to DQ flags for guidance using the downwelling shortwave hemispheric irradiance data during this time range. |
Measurements: | sgpsirsE9.b1: more
sgpsirs20sE9.a0: more sgpsirsE9.00: more |