Created: 2014-02-03 11:47:19
Modified: 2016-10-24 12:28:43
SAMPLING DESIGN AND METHOD:
Beginning in 1996, the active layer has been probed at least annually at the site. The procedure involves pushing a metal rod, calibrated in cm, to the point of refusal, interpreted in most cases to be the frost table. Thaw depth measurements at each site were obtained by probing at 5 m intervals along the plot’s two perpendicular and one diagonal transect, resulting in 71 points per plot per probing date.
In 1995 the site was instrumented with several OnsetTM portable data loggers connected to probe-type thermistors. Each logger/thermistor system has an effective temperature range of -50oC to +33oC and resolution of approximately 0.32oC. At the site, one thermistor was placed in a radiation shield approximately 2 m above the ground surface, and one thermistor placed at the interface between mineral soil and organic material within the proximity of the mast. Temperature measurements were collected at, 1 hr, and 2 hr intervals depending on season, and year. Details on methodology are provided in Klene et. al 2001.
CALM USA George Washington University
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