Kosei Komatsu / Associate Professor / Division of Environmental Studies
Department of Natural Environmental Studies / / Marine ecosystem dynamics

Career Summary
1991: Graduated, Meteorological College
1996: Doctor of Science, Kyushu University
1996-1997: Postdoctoral Researcher, Kyushu University
1997-2005: Researcher, National Research Institute of Fisheries Science, Fisheries Agency
2001-2002: Guest Scientist: Max-Planck Institute for Meteorology, Germany
2005-2007: Senior Researcher, National Research Institute of Fisheries Science, Fisheries Research Agency
2007-2008: Group Leader, National Research Institute of Fisheries Science, Fisheries Research Agency
2008-present: Associate Professor, The University of Tokyo
Educational Activities
Department of Living Marine Resources, Atmosphere and Ocean Research Institute
Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences

Research Activities
1) Numerical Study on Marine Ecosystem Dynamics (1997-):
The mechanism of the marine ecosystem is investigated using a 3D ecosystem model based on a data-assimilated ocean general circulation model. We focus on important topics of the marine ecosystem such as the recent decline of Japanese sardine resources and the appearance of huge numbers of giant jellyfish around Japan.

Numerical forecast of transport of giant jellyfish
Numerical forecast of transport of giant jellyfish

2) Observational Study on Modification Processes of Marine Water Mass (1998-)
Distribution and modification processes of marine water masses are investigated by conducting in situ observations in order to evaluate the impact of marine physical environmental change on the marine ecosystem.
1)Komatsu, K., Matsukawa, Y., Nakata, K., Ichikawa, T., and Sasaki, K., 2007: Effect of advective processes on planktonic distribution in the Kuroshio region by a 3-D lower trophic model with data assimilated OGCM, Ecological Modeling, 202, 105-119.
2)Kasai, A., Komatsu, K., Sassa, C., and Konishi, Y., 2008: Transport and survival processes of eggs and larvae of jack mackerel (Trachurus japonicus) in the East China Sea. Fish. Science. 74, 8-18.
3)Komatsu, K., Hiroe, Y., Yasuda, I., Kawasaki, K., Joyce, T.M., and Bahr, F., 2004: Hydrographic structure and transport of the Kuroshio intermediate water south of Japan, Journal of Oceanography, 60, 487-503.
Other Activities
Member of the Oceanographic Society of Japan
Member of the Japanese Society of Fisheries Oceanography
Member of the American Geophysical Union
Guest Scientist of the Fisheries Research Agency
Future Plan
We will continue to investigate the mechanisms of the marine ecosystem by using the advanced techniques of field observation and numerical simulation in order to evaluate and predict the effects of multi-scale change of the marine physical environment on living marine resources.
Messages to Students
Compromise is not necessary for learning. I hope you are thorough in your learning and thinking.