Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
08/20/1994 | 0230 | 08/31/1994 | 1542 | Incorrect |
Subject: | SGP/EBBR/E12 - Miscellaneous Problems Affecting Data |
DataStreams: | sgp5ebbrE12.b1, sgp30ebbrE12.b1, sgp15ebbrE12.b1 |
Description: | Three hardware problems occurred at E12, Pawhuska, OK in late August 1994. On August 12 the wind direction sensor malfunctioned. Therefore, all wind direction, sigma, and resultant wind speed values for the period above are incorrect. The wind direction sensor was replaced on August 31. Affected data are: 5 minute: wind_d, sigma_wd, res_ws 15 minute: mv_wind_d 30 minute: wind_d, sigma_wd, res_ws. Water accumulated in the AEM motor box and apparently caused a reduction in the voltage level of the home signal (battery condition was very good and so was not the cause); by late August 27 the hom30 level had fallen below the minimum qc check level. The AEM continued to exchange properly. The minimum qc level check is intended to help detect either a non-operating AEM or low battery condition. The Campbell CR10 software operates properly unless the hom30 signal is thirty-five or greater. So the low hom30 values do not result in any incorrect data!!!. I point this out because this situation demonstrates a condition flagged by the qc checks, even though no effect on the data has occurred. The AEM box was dried out and new dessicant placed in it on August 31. On August 28, 1994 the left AEM housing ventilation fan ceased to operate because of clogging of the ventilation system with debris. Fifteen minute data seems to indicate that the fan stopped operating just before 1245 GMT. This is at least the third such incidence of clogging this summer at different EBBRs. The clog was removed and ventilation restored on August 31. The lack of ventilation caused improper measurements of temperature and relative humidity in the left housing (these are quite obvious in the 15 minute data but difficult to detect in the 30 minute data) and therefore incorrect values of sensible and latent heat. Affected data are: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_l, mv_hum_l, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h. |
Suggestions: | |
Measurements: | sgp15ebbrE12.b1: more
sgp5ebbrE12.b1: more sgp30ebbrE12.b1: more |