Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
11/04/1997 | 2030 | 11/05/1997 | 2230 | Suspect |
Subject: | SGP/TWR/C1 - West RH Probe Replacement |
DataStreams: | sgp1440twr25mC1.a0, sgp30twr25mC1.a1, sgp1twr60mC1.a0, sgp1440twr60mC1.a0, sgp30twr60mC1.a1, sgp1twr25mC1.a0 |
Description: | On 4-5 November 1997, the Qualimetrics RH probes were removed from the west elevator 25 and 60 meter levels and replaced with Vaisala probes. The Vaisala probes had to be inserted upside down in the Qualimetrics aspirators to make them fit. Data during the period above is incorrect. The west temperature probes appeared to need recalibration, so that was done on 5 November. Little improvement in the comparison of west and southeast carriage temperatures can be detected in the data after 5 November. RH comparisons show that the west and southeast side Vaisala probes agree within 1% normally, with only a very occasional 3% to 4% difference (when RH is greater than 90%). West side temperatures are normally greater in the daytime especially, an indication that the aspiration rate in the west side aspirators is marginal, as I reported when they were installed 5 years ago. The west side metal aspirators also have more thermal mass than the plastic southeast aspirators; the combination of this with the lower aspiration rate causes the west side temperatures to not drop as rapidly as those measured on the southeast side when the temperature is decreasing. The west side temperatures are often 0.2 to 0.6 degrees higher than the southeast side during the midday. Obviously, when the temperature differences are large, the RH tends to be slightly smaller on the west side. The vapor pressure differences between the west and southeast sides are very small, 0.03 kPa or less, usually much less, a result that should make the WVIOP community happy. |
Suggestions: | |
Measurements: | sgp1twr25mC1.a0: more
sgp30twr25mC1.a1: more sgp1twr60mC1.a0: more sgp1440twr60mC1.a0: more sgp1440twr25mC1.a0: more sgp30twr60mC1.a1: more |