Japan Geoscience Union Meeting 2016

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Symbol A (Atmospheric and Hydrospheric Sciences) » A-CC Cryospheric Sciences & Cold District Environment

[A-CC21] Ice cores and past environmental changes

Wed. May 25, 2016 10:45 AM - 12:15 PM 102 (1F)

Convener:*Kenji Kawamura(National Institute of Polar Research, Research Organization of Information and Systems), Nozomu Takeuchi(Chiba University), Ayako Abe-Ouchi(Atmosphere and Ocean Research Institute, The University of Tokyo), Ikumi Oyabu(National Institute of Polar Research, Research Organization of Information and Systems), Chair:Kenji Kawamura(National Institute of Polar Research, Research Organization of Information and Systems), Ikumi Oyabu(National Institute of Polar Research, Research Organization of Information and Systems)

11:45 AM - 12:00 PM

[ACC21-11] Carbonate mineral particles observed in a layer of an ice core drilled from Grigoriev ice cap in Kyrgyz Tienshan, Central Asia

*Nozomu Takeuchi1, Koji Fujita2, Vladimir Aizen3 (1.Chiba University, 2.Nagoya University, 3.University of Idaho)

Keywords:ice core, carbonate minerals, Central Asia

In 2007, an 87 m-deep ice core were successfully drilled on Grigoriev Ice Cap (4600 m a.s.l.) located in the Tien Shan Mountains, Kyrgyztan. We report a layer rich in carbonate mineral particles found at 53.5 m deep in the ice core. Although a number of dust layers consisting of silicate mineral particles were contained in the ice core, the layer contained less silicate, but abundant carbonate mineral particles. Significant negative stable isotope values and higher concentrations of major chemical solutes were also observed at the layers. Pollen based dating of the ice core showed that the layer corresponded to 1833 A.D. Results suggest that the layer was derived from a huge storm. Although the origin of the carbonate minerals is still mystery, it is probably far distant arid area.