All weather parameters were measured hourly using Onset sensors attached to a Hobo U30 datalogger. The tipping bucket rain gage is unheated and thus gives only an estimate of liquid precipitation. The anemometer was placed at 3m at the top of the tower, with solar radiation and the rain gage immediately below the anemometer arm. Temperature and relatively humidity were measured within a ventilated shield. Pressure was measured within the datalogger unit.

At the Toolik River and I-minus-2 gulley thermokarsts, sites were adjacent to the top of the thermokarst feature and analogous measurements were made. In order to coordinate with the ARCSS/TK team measurements at TRTK, measurements in the summer period were taken at 5-min intervals in 2009-2011: cumulative (rainfall) or average (all other parameters) hourly values are reported here based on those 5-min data.

Note that Water Content sensors are not calibrated and data may not be accurate, but are useful for investigating gross wetting and drying patterns.