Japan Geoscience Union Meeting 2024

Presentation information

Print

[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS11] Mountain Science

Mon. May 27, 2024 1:45 PM - 3:00 PM 201B (International Conference Hall, Makuhari Messe)

convener:Yoshihiko Kariya(Department of Environmental Geography, Senshu University), Akihiko SASAKI(Department of Geography and Environmental Studies, Kokushikan University), Chiyuki Narama(Niigata University, Program of Field Research in the Environmental Sciences), Motoshi Nishimura(Interdisciplinary Cluster for Cutting Edge Research, Institute for Mountain Science, Shinshu University), Chairperson:Motoshi Nishimura(Arctic Observation Center, National Institute of Polar Research), Yoshihiko Kariya(Department of Environmental Geography, Senshu University)

2:00 PM - 2:15 PM

[MIS11-02] Time required for the trasformation from firn to ice using ice cores excavated from Shakushizawa snow patch.

Komei Takeda2, *Chiyuki Narama1, Nozomu Takeuchi3 (1.Niigata University, Program of Field Research in the Environmental Sciences, 2.Niigata University, Graduate school of Science and Technology, 3.Chiba University, Faculty of Science)

Keywords:perennial snow patch, ice core, pollen analysis, transformation of firn to ice

To know the transformation of firn to ice on the glacier and snow patch, we drilled ice cores (706 cm and 330 cm) on14-15 October and 18 September 2023 for Shakushizawa snow patch. We measured density, water content, pollen analysis and oxygen isotope ratio analysis for two ice cores. As a result of these analyses, the peak pollen concentration and the dirty layer do not match. This result shows that if the dirty layer is used to be an annual layer boundary, the years of layers may be underestimated.