4:00 PM - 4:15 PM
[MIS12-07] Reconstruction of Holocene terrestrial paleoclimate using a stalagmite from Kiriana, Mie Prefecture
Keywords:paleoclimate, stalagmite, oxygen isotope, carbonate clumped isotope
In recent years, as global warming progresses, it has become increasingly important to elucidate past climates in detail. In particular, we believe that paleoclimatic information in the temperate to tropical terrestrial regions where humans live is essential for predicting the future of the Earth and humankind.
In this presentation, we will report the results of our study of the Misty Hole in Mie Prefecture, Japan. A 35 cm long stalagmite sample was found to retain records spanning the past 14,000 years as a result of uranium thorium radiometric dating. Using proxies such as oxygen/carbon isotope ratios, Mg/Ca ratios, and sedimentation rates, quantitative estimates of temperature and qualitative evaluation of precipitation were possible. In addition, utilizing carbonic acid flocculation isotope ratios measured at Kyushu University, it was possible to obtain univocal information on air temperature, and these data also provided useful data on air temperature changes.
The results suggest a trend of increasing precipitation in the vicinity of the Fog Hole with an increase in temperature of 2-3°C approximately 7000-10,000 years ago. In addition, temporary cold and arid conditions were obtained during the Late Jomon Period, about 3,000 years ago, providing a background that triggered social change.
In this presentation, we will report the results of our study of the Misty Hole in Mie Prefecture, Japan. A 35 cm long stalagmite sample was found to retain records spanning the past 14,000 years as a result of uranium thorium radiometric dating. Using proxies such as oxygen/carbon isotope ratios, Mg/Ca ratios, and sedimentation rates, quantitative estimates of temperature and qualitative evaluation of precipitation were possible. In addition, utilizing carbonic acid flocculation isotope ratios measured at Kyushu University, it was possible to obtain univocal information on air temperature, and these data also provided useful data on air temperature changes.
The results suggest a trend of increasing precipitation in the vicinity of the Fog Hole with an increase in temperature of 2-3°C approximately 7000-10,000 years ago. In addition, temporary cold and arid conditions were obtained during the Late Jomon Period, about 3,000 years ago, providing a background that triggered social change.