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Evaluations of subsurface flow for reconstructions of climate change using borehole temperature and isotope data in Kamchatka |
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| Authors: | Akinobu Miyakoshi Makoto Taniguchi Yasukuni Okubo Takeshi Uemura |
| Institution: | a Geological Survey of Japan, AIST (National Institute of Advanced Industrial Science and Technology), 1-1-1-#7, Higashi1, Tsukuba, Ibaraki 3058567, Japan b Research Institute for Humanity and Nature, Kyoto 602-0878, Japan c Geological Survey of Japan, AIST (National Institute of Advanced Industrial Science and Technology), Tsukuba 3058567, Japan d The Graduate University for Advanced Studies, (NIPR) 9-10, Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan |
| Abstract: | Subsurface temperature is affected by heat advection due to groundwater flow and surface temperature changes. To evaluate their effects, it was implemented the measurements of temperature-depth profile (T-D profile) and the continuous monitoring of soil temperature in the southern part of Kamchatka which has not affected by human activity. Additionally, stable isotopic compositions of surface water and groundwater were analyzed. T-D profile and stable isotopic compositions show groundwater flow system is differ from the shallow aquifer to the deep aquifer. In the shallow aquifer, T-D profile suggests the existence of upward groundwater flux. On the other hand, the annual variation of soil temperature is divided into the large variation period (VP) and the stable period (SP) by the magnitude of daily and seasonal variation. VP and SP correspond to the summer and the winter season, respectively, and it considers that the difference between VP and SP is caused by the effect of snow cover. Therefore, the T-D profile is affected by not only upward groundwater flux but also the surface warming particularly in the summer season (VP). |
| Keywords: | Temperature-depth profile (T-D profile) Stable isotope Groundwater flow Soil temperature Kamchatka |
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