Figure 3
From: A naturally-occurring ‘cold earth’ spot in Northern China
Spatial and temporal distribution of ground temperatures in the 5 monitoring boreholes on the ‘cold’ scree slope (unit: °C).
(a) Ground temperature in borehole No. 1, showing a permanent frozen zone from 2 m to 4 m in depth. (b,c,e) Ground temperature in boreholes No. 2, No. 3 and No. 5, showing a existence of 2-m thick seasonal frozen ground. (d) Ground temperature in borehole No. 4, showing a permanent frozen zone from 2 m to more than 5 m in depth.
