JpGU-AGU Joint Meeting 2020

Presentation information

[E] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS08] Paleoclimatology and paleoceanography

convener:Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Benoit Thibodeau(University of Hong Kong), Akitomo Yamamoto(Japan Agency for Marine-Earth Science and TechnologyAtmosphere and Ocean Research Institute), Hitoshi Hasegawa(Faculty of Science and Technology, Kochi University)

[MIS08-P16] Paleovegetation and paleoenvironmental changes in the northern Mongolia since MIS 3 (preliminary results)

*Ryosuke Imaoka1, Koji Shichi2, Hitoshi Hasegawa1, Niiden Ichinnorov3, Nagayoshi Katsuta4, Davaasuren Davaadorj5, Masafumi Murayama1, Miho Sasaoka1, Masao Iwai1 (1.Kochi University, 2.Forestry and Forest Products Research Institute, 3.Mongolian Academy of Sciences, 4.Gifu University, 5.National University of Mongolia)

Keywords:pollen analysis, paleovegetation, global warming

We present results of paleovegetation and paleoenvironmental analysis for new lake sediment record of Sangiin Dalai lake in the northern Mongolia. We took a surface sediment core in August 2016 (16SD02; 84 cm length), and five boring cores in March 2019 (19SD01~05; totally ca. 16 m length) from Sangiin Dalai lake, a large permanent hard water lake. The studied lake is located in the southern margin of Siberian continuous permafrost zone, and surrounded by forest-steppe vegetation dominated by Larix Sibirica. In order to reconstruct paleoenvironmental and paleovegetation change, we conducted palynological analysis and high-resolution elemental composition analysis using μXRF core scanner (Cox, Itrax) at Center for Advanced Marine Core Research, Kochi University. We also performed 14C and OSL age dating. On the basis of palynological analysis and biome reconstruction (Tarasov et al., 2000), marked vegetation changes from steppe-desert in last glacial to steppe-taiga in the Holocene were reconstructed. We also note the periodic lithological change indicating drastic lake environmental change during MIS 3. Further palynological analysis for reconstructing variations in paleovegetation and paleoenvironment in the northern Mongolia since MIS 3, and comparison with palynological record in surrounding area (e.g., Kotokel lake in southern Siberia: Shichi et al., 2009; and Orog lake in southern Mongolia: Yu et al., 2019) are now ongoing.


Shichi, K., Takahara, H., Krivonogov, S. K., Bezrukova, E. V., Kashiwaya, K., Takehara, A., & Nakamura, T. (2009). Late Pleistocene and Holocene vegetation and climate records from Lake Kotokel, central Baikal region. Quaternary International, 205, 98-110.

Tarasov, P. E., Volkova, V. S., Webb III, T., Guiot, J., Andreev, A. A., Bezusko, L. G., et al. (2000). Last glacial maximum biomes reconstructed from pollen and plant macrofossil data from northern Eurasia. Journal of Biogeography, 27, 609-620.

Yu, K., Lehmkuhl, F., Schlütz, F., Diekmann, B., Mischke, S., Grunert, J., et al. (2019). Late Quaternary environments in the Gobi Desert of Mongolia: Vegetation, hydrological, and palaeoclimate evolution. Palaeogeography, Palaeoclimatology, Palaeoecology, 514, 77-91.