Ground temperatures in ice-cemented ground at Linnaeus Terrace, Dry Valleys, AntarcticaEntry ID: ggd6
Abstract: Soil temperatures were measured with Campbell 107 soil thermistors. Thermistors were placed at 0, 17, 23 (just above the ice-cemented permafrost) and 40 cm depth. To emplace the sensors, first a soil pit was dug to the level of ice-cemented permafrost. Then a hammer drill was used to make a narrow, 15 cm deep hole into the ice-cemented ground. The thermistor was placed into the drill hole. This ... procedure caused minimal disturbance to the ice-cemented ground. Air temperature and humidity were measured with a Campbell 207 air probe. The temperature on the surface of an outcrop of Beacon sandstone was measured with a T-type thermocouple. Sunlight was measured with a LiCor 200 pyranometer. The sensors were deployed during Jan 1993 but (due to equipment failure) data storage began only on 6 Jan 1994 and was continued until 16 Jan 1995. All temperature sensors were removed after the data collection interval and calibrated in the laboratory. Calibrations were applied using the Steinhart and Hart (1968) representations for the temperature dependence of the thermistor resistance. This was necessary since the instrumental calibration for the 107 thermistor provided by Campbell did not extend below -40C. After correction, the error in the temperature measurement is estimated to be less than 0.2 C and error in the humidity measurement was Campbell 207 RH sensor has high errors for relative humidity values below 15% --- tending to systematically overestimate values by more than 10% humidity. The error in the averaged light measurement is less than 10 W/m2. All sensors were sampled once every 10 minutes and averages of three measurements were written to final memory every 30 minutes corresponding to 48 recordings each day. Data are stored in columns of ASCII data; entries are 1. Digital day of year in 1994 2. Air temperature 3. Air relative humidity 4. Sunlight, W/m2 5. Soil surface temperature 4. Sunlight, W/m2 5. Soil surface temperature 6. Temperature at 17 cm depth 7. Temperature at 23 cm depth 8. Temperature at 40 cm depth 9. Temperature on surface of rock Data are presented on the CAPS Version 1.0 CD-ROM, June 1998.
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Start Date: 1994-01-01Stop Date: 1994-12-31
Email: cmckay at mail.arc.nasa.gov
NASA Ames Research Center Space Science Division Mail Stop 245-3
City: Moffett Field
Province or State: CA
Postal Code: 94035
Mckay, C.P., Mellon, M.T., Friedmann, E.I. 1998. Soil temperatures and stability of ice-cemented ground in th McMurdo Dry Valleys, Antarctica. Antarctic Science, 10(1), p. 31-38.
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Last DIF Revision Date: 2010-12-29