Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
06/25/2008 | 1736 | 07/10/2008 | 1530 | Does not affect quality |
Subject: | SGP/SIRS/E5 - Incorrect Calibration Coefficient |
DataStreams: | sgpsirsE5.b1, sgpsirsE5.00, sgpsirs20sE5.a0 |
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. |
Suggestions: | No changes or reprocessing is recommended. Users are directed to the SIRS instrument handbook for information on reproccessing this data using the original raw data if desired. |
Measurements: | sgpsirsE5.b1: more
sgpsirs20sE5.a0: more sgpsirsE5.00: more |