Researcher Database

（Last updated : 2022-01-06 16:54:16）

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KUMAGAI Michio

Department / Course Research Organization of Science and Technology

Title / Position Professor

Other Affiliations
1.	Research Organization of Science and Technology Research Centre for Palaeoclimatology

Academic background
1.	～1977/03	Doctoral Program (1st Semester) │ Graduate School, Division of Natural Science │ Kyoto University │ Completed Master of Science
2.	～1980/03	Doctoral Program (2nd Semester) │ Graduate School, Division of Natural Science │ Kyoto University │ Completed Doctor of Science

Subject of research
1.	AUV Tantan confirmed the existence of vents in Lake Biwa, and provided evidence that their density may be increasing. Bottom turbidity concentration also showed dramatic increase and it is closely correlated with the lake reduction. This trend may reflect crustal movement related to 2011 Tohoku-Oki
2.	In Mongolia, it is reported that several lakes have been lost due to excess evaporation. Lakes in Mongolia do not only play a crucial role for preserving diversity of wild animals, but also they are valuable resources for nomadic people's life. This project aims at suggesting an appropriate method o

Research summary
The increase of the turbidity concentration at the bottom of Lake Biwa and its generating factors Lake Biwa has been shrinking in the zonal direction since 2006. It has been revealed that the turbidity concentration has been increasing near the bottom of the lake accordingly. It seems to be related with the increase in the vent activity at the bottom of the lake. The purpose of the research is to make clear the relation between the vent activity and turbidity concentration at the bottom of the lake by evaluating stress change occurred in the bottom of the lake caused by the shrinkage and expansion of the lake using GNSS (Global Navigation Satellite System) provided by Geospatial Information Authority of Japan. As the research that relates the change of water quality with crustal activity has not been found so far, it is academically interesting from the aspect of the cause of the formation of Lake Biwa. In addition, it is possible to contribute to earthquake prediction if the relation between the turbidity concentration and large-scale crustal activity can be made clear by elucidating the specific nature of Lake Biwa through the implementation of the research. Therefore, the research will play an important role in the society.

Present specialized field
Environmental Dynamic Analysis, Environmental impact assessment, Environmental engineering and reduction of environmental burden, Meteorology/Physical oceanography/Hydrology (Keyword：Geophysics, Limnology, Autonomous Underwater Vehicle, Global warming)

Books
1.	2013/02	Climatic Change and Global Warming of Inland Waters: Impacts and Mitigation for Ecosystems and Societies │ ,pp.448 (Co-authored)
2.	2003/02	Freshwater management │ ,pp.233 (Co-authored)
3.	2003/02	Water Resources Systems – Hydrological risk, management and development │ ,pp.365 (Co-authored)
4.	2003/02	Water Resources Systems - Water availability and global change │ ,pp.321 (Co-authored)
5.	1995/02	Physical processes in a large lake: Lake Biwa, Japan │ ,pp.216 (Co-authored)

Papers
1.	2022/03/03	Causal networks of phytoplankton diversity and biomass are modulated by environmental context. │ NATURE COMMUNICATIONS │ 13 (1140) (Co-authored)
2.	2021	Increasing benthic vent formation: a threat to Japan's ancient lake │ (Co-authored)
3.	2020/07	Extreme warming and regime shift toward amplified variability in a far northern lake │ Limnology and Oceanography │ (9999),pp.1-13 (Co-authored)
4.	2020	Effect of precipitation-influenced river influx on Lake Biwa water levels: time scale analysis based on an impulse response function, Inland │ Inland Waters │ 10 (2),pp.283-294 (Co-authored)
5.	2020	Long-term warming destabilizes aquatic ecosystems through weakening biodiversity-mediated causal networks. │ Global Change Biology │ (Co-authored)
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Winning science prize
1.	2007/08	International Society of Limnology SIL Baldi Memorial Lecture Award
2.	2004	Water Prize Japan Water Prize for Promotion