6.1 Ground temperature
Geothermal measurements were carried out at the Suntar-Khayata Station
site in three boreholes at depths down to 10-20 m in 1958. Temperature
measurements were made 4 times a day at depth horizons to a depth of 1
m, once a day to a depth of 5 m and once every five days on deeper
horizons. Average monthly ground temperatures at numerous horizons were
published in Grave (1959). We used these data to verify ground
temperature modeling which was conducted on a daily time step at
different depths using thermal-physical soil properties. Mean absolute
deviations between simulated and observed monthly temperatures accounted
for 1.1 ºС, 0.7 ºС, 0.2 ºС and 0.3 ºС, and their maximum values – +3.6
ºС (December), +4.0 ºС (November), +2.4 ºС (June) and -1.7 ºС (January)
at 5, 50, 100 and 200 cm depths correspondingly in 1958 (Table 4).
Overall, modelled soil temperature values at different depths provide a
good fit to the observed values (Fig. 3).