Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
07/01/1996 | 2030 | 07/28/1996 | 0015 | Suspect |
07/02/1996 | 1925 | 07/22/1996 | 0200 | Suspect |
07/01/1996 | 1835 | 07/24/1996 | 0015 | Suspect |
Subject: | Loss of thermal stabilization |
DataStreams: | sgp5mwravgB4.c1, sgp5mwravgB5.c1, sgp5mwravgB1.c1 |
Description: | DQR No: Platform: sgpmwrlos, sgp5mwravg, sgpqmemwrlos Subject: Loss of thermal stabilization Date Submitted: Submitted By: JIM LILJEGREN _X_ Instrument Mentor ___ EST Member ___ 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: What level data: a0,a1,c1 What location was the data collected at: SGP B1 (Hillsboro, KS) SGP B4 (Vici, OK) SGP B5 (Morris, OK) SGP B6 (Purcell, OK) SGP C1 (Lamont, OK) Period of time in question (see table below) Data should be labeled: ___ questionable ___ All data fields affected _X_ incorrect _X_ Only some data fields affected: ___ wrong calibration ___ others "23tbsky","31tbsky","vap","liq" Discussion of Problem: I pointed out in a previous DQR (D960405.1) that during August of 1994 and 1995 the microwave radiometers would lose thermal stabilization on very hot, sunny days when the temperature in the radiometer enclosure rose above the set point for thermal stabilization (~50 deg C). Although I had planned to travel to the SGP prior to August 1996 to adjust the set points upward to prevent this problem from occuring this year, the temperatures in July 1996 were hotter than in previous years and the loss of stabilization problem occurred before I could make the needed adjustment. The purpose of this note is the identify the time periods for which this problem occurred. More specific information about the problem, including how the problem is detected and its effect on the reported values of integrated water vapor and integrated cloud liquid water are provided in the earlier DQR. It is useful to repeat here that when the thermal stabilization is lost, the reported precipitable water vapor increases and the liquid water path decreases (and becomes SIGNIFICANTLY NEGATIVE (-0.1 mm) on clear sky days). The RMS noise level in the data also increases sharply. THESE ANOMALOUS VALUES HAVE BEEN INCLUDED IN THE 5-MINUTE AVERAGES. LOCATION BEGINNING DATE AND TIME ENDING DATE AND TIME C1 (Central Facility) 1 July 96 18:25 GMT 2 July 96 02:00 GMT 2 16:45 3 02:30 3 17:40 4 02:15 4 15:50 4 17:10 5 17:00 6 03:30 6 16:00 7 03:00 7 20:20 8 01:30 18 20:00 18 23:45 19 18:30 20 01:20 20 19:45 21 02:25 21 17:00 22 02:20 22 19:30 23 23:00 B1 (Hillsboro, KS) 1 July 96 20:30 2 July 96 01:15 2 17:00 3 02:00 17 20:30 18 00:15 18 19:25 19 02:00 19 19:00 20 02:30 20 18:35 21 00:30 21 20:20 22 01:40 28 20:55 28 00:15 B4 (Vici, OK) 2 July 96 19:25 2 July 96 23:15 3 19:35 3 21:15 4 20:40 5 00:30 5 19:15 6 02:00 6 19:00 6 22:40 7 20:45 8 00:30 21 19:45 22 02:00 B5 (Morris, OK) 1 July 96 18:35 2 July 96 00:45 2 17:20 3 01:15 3 17:25 4 02:00 5 20:20 6 01:45 6 16:45 7 02:30 7 18:10 8 01:00 19 20:00 20 00:20 20 19:30 21 00:55 21 18:15 22 01:30 22 19:30 23 01:15 23 22:00 24 00:15 B6 (Purcell, OK) 1 July 96 20:15 2 July 96 00:10 2 18:40 3 00:05 3 20:40 4 00:35 4 20:15 5 00:10 5 19:45 6 01:15 6 19:10 7 01:40 19 21:30 19 23:00 20 20:15 21 00:05 21 21:45 22 01:00 22 21:45 23 00:00 Other observations/measurements impacted by this problem: none Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag with this comment. |
Suggestions: | |
Measurements: | sgp5mwravgB5.c1: more
sgp5mwravgB4.c1: more sgp5mwravgB1.c1: more |