Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
06/01/1994 | 0000 | 09/01/1994 | 2359 | Suspect |
Subject: | Bad virtual temps for air virtual temp above 30 dec C |
DataStreams: | Dsgp50rwptempC1.a1, Dsgp50rwptempC1.a0, Dsgp915rwptempC1.a1, Dsgp50rwptempC1.a2, Dsgp915rwptempC1.a2, Dsgp915rwptempC1.a0 |
Description: | DQR No: Platform: Subject: Bad Virtual temps for air virtual temperature above 30 deg C. Date Submitted:23 Nov 1994 Submitted By: Richard L. Coulter _x_ Instrument Mentor ___ EST Member _x_ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement:50 and 915 RASS temperatures What level data: (raw,a0,a1,b1,c1 etc):a0,a1,a2 What location was the data collected at: CF Period of time in question Begin Date 6/1 /94 Time : (GMT) End Date 9/1 /94 Time : (GMT) Data should be labeled: _x__ questionable ___ All data fields affected _x_ incorrect _x_ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: When operating the RASS, a temperature range is selected for system operation. When the real-time data are analysed by the system, spectra are collected and acoustic frequencies used that fit that temperature range. For summertime operation, the selected temperature range was -11 to +30 C. Maximum temperature s in the lower 500 m sometimes exceeded 30 deg. C. When this happened, the report ed temperatures were usually near 30 - 31 deg rather than the correct (higher) valu e. One might have expected the system to report no good data through its internal QC; however the digital FFT spreads energy from the central peak through neighboring frequency bins; this leads to energy in the maximum FFT bin allowed and results in erroneous temperatures. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) During summertime operation the maximum temperature should be 35 - 40 deg C. In general, site operators and the instrument mentor need to be aware of the range of temperatures to be expected and modify the system parameter files when necessary. Data Processing Notes Date |
Suggestions: | |
Measurements: | Dsgp915rwptempC1.a0: more
Dsgp915rwptempC1.a1: more Dsgp915rwptempC1.a2: more Dsgp50rwptempC1.a0: more Dsgp50rwptempC1.a2: more Dsgp50rwptempC1.a1: more |