Evaluation of Subsurface Thermal Environment in the High Latitude Region-Effects of snow cover and global warming-:Effects of snow cover and global warming
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概要
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Subsurface temperature-depth profile preserves the variation of surface temperature, and thus it is considered as an excellent index of the climatic change. To reconstruct the climatic change based on temperature-depth profile, it is necessary to evaluate the effects of the land cover/use changes and of heat advection due to groundwater flow. The purpose of this study is the evaluation of the effects of surface temperature environment and groundwater flow on the subsurface thermal environment in the Kamchatka where human activity negligibly affects subsurface thermal environments. We carried out observations of subsurface temperature-depth profile, the long-term monitoring of soil temperature and analysis of the isotopic ratio of hydrogen and oxygen of water samples. The lithology in the study area consists of the alluvium and sedimentary rocks of the Cretaceous. They have different groundwater flow systems as clarified by the isotopic ratio of oxygen and hydrogen. This difference is also suggested by the temperature-depth profile, which shows the existence of the upward groundwater flow in the alluvium. On the other hand, the annual variation of soil temperature is classified into the large variation period and the stable period. The former is period when the surface is not covered with snow and the latter is covered with snow. The daily change is not observed and temperature is higher than 1.1 degree Celsius in the stable period. It suggests that the increase of subsurface temperature within the shallow zone (>30m) is caused by the rising of the mean air temperature in the non-snow period (large variation period) due to the climatic change, i.e., global warming. Therefore, subsurface temperature is useful to evaluate global environmental change in the high latitude region.
- 日本地熱学会の論文
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