Description: | Soil moisture sensor #1 at Cement, Ok, E26 began a slow drift downwards on
July 31, 1994. This continued until the sensor was replaced at 1700 GMT on
August 17, 1994. The downwards drift occured coincident with a constant
decrease in soil moisture at the site. As a result, the average soil
moisture (for the set of five sensors) was reduced by only about 2% (for a
range of 10 to 22%), and thus had a negligible effect on the calculations
of sensible and latent heat flux. The sm1 output dropped below zero at
times during August 14-17.
Soil Moisture #1 Data Fields:
15 minute: r_sm1
30 minute: sm1 |