Underground temperatures were measured in more than thirty boreholes for heat flow investigations in Cuba. The negative temperature gradient in the near surface layer and the pronounced "U-shape" of the temperature-depth curve seem to be a general phenomenon for most of the island. As it does not depend on the depth of the water table or conductivity contrast, it must reflect the changing surface conditions. From the theory of the heat conduction in a semi-infinite body, temperature changes at the surface propagate into the subsurface with an amplitude attenuation and time delay that increase with depth. With the application of this theory on detailed T(z)-records, important information on the pattern of recent climate changes in Cuba have been obtained, confirming surface warming by 2-3° Celsius during the last 200-300 years. The climatic effect has been possibly combined with the agricultural effect produced by clearing forests in most parts of Cuba 100-200 years ago.
ASJC Scopus subject areas
- Global and Planetary Change