LEGEND

Methods: 2-4 digit numbers refer to size of grid in meters (10,100,1000); Some sites have a combination of methods; P = single point probe or multiple points along transect; TT = thaw tube; T = interpolated thaw depth based on temperature profile, generally obtained by data logger, accuracy = +/- 10 cm; B = nearest borehole, number is depth in m.  tba = data being processed; I = Inactive.

Data: dash (-) = site not yet established; * = no data collected from site that year; # = Russian 1000-m grids in 1997 only; all other data from 100-m grids.  [ ] = Canadian sites with 100-m grids; For sites with boreholes >2m, interpolated thaw reported in 0.1 m

Data compiled by Jerry Brown and Ken Hinkel