Abstract
On long time scale and over large area, ground surface temperature (GST) tracks surface air temperature (SAT). GST changes propagate into the subsurface, exponentially decreasing in amplitude with increasing time and depth. The solid earth filters out daily and seasonal GST changes while maintaining a running record of the long-term average and departures from it. Borehole temperatures, therefore, can be used to recover climate changes over period of time in an area, which can be used to interpret local warming in the area over the last century. In this study, temperature perturbation due to GST changes is calculated in two different models. One is a homogeneous half space model; the other is a layered earth model which consists of two layers. The difference between them is not quite considerable. Therefore, it is possible to consider the subsurface as homogeneous half space.
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