PEAK Staff Profile

Yu Kosaka
Associate Professor – Environmental Sciences

Contact : ykosaka[at]


Prof. Kosaka Dr. Yu Kosaka is an Associate Professor at Research Center for Advanced Science and Technology (RCAST), the University of Tokyo. She obtained her Ph.D. at Department of Earth and Planetary Science, School of Science at the University Tokyo in 2007. She worked at International Pacific Research Center, University of Hawaii, and Scripps Institution of Oceanography, University of California San Diego, before moving to RCAST at the University of Tokyo in 2014. Her research focuses on variability and changes of the climate system as natural science. She served as Lead Author of Working Group 1 contribution to the sixth Assessment Report (AR6WG1) of Intergovenmental Panel on Climate Change (IPCC).

Research Interests

As an expert of climate dynamics, she works on continental and ocean basin-scale climate variability and change, through analysis and model simulation of the atmosphere and ocean as a dynamical system. In particular, she is interested in large-scale atmospheric circulation variability and associated atmosphere-ocean interaction.

Selected Publications

Takaya, Y., Y. Kosaka, M. Watanabe, and S. Maeda (2021) Skilful predictions of the Asian summer monsoon one year ahead. Nature Communications, 12, 2094.
Mori,M., Y. Kosaka, M. Watanabe, H. Nakamura, and M. Kimoto (2019) A reconciled estimate of the influence of Arctic sea-ice loss on recent Eurasian cooling. Nature Climate Change, 9, 123-129.
Kosaka, Y. and S.-P. Xie (2016) The tropical Pacific as a key pacemaker of the variable rates of global warming. Nature Geoscience, 9, 669-673.
Kosaka, Y., and S.-P. Xie (2013) Recent global-warming hiatus tied to equatorial Pacific surface cooling. Nature, 501, 403-407.
Kosaka, Y., S.-P. Xie, N.-C. Lau, and G. A. Vecchi (2013) Origin of seasonal predictability for summer climate over the Northwestern Pacific. Proc. Natl. Acad. Sci. USA, 110, 7574-7579.