Kyushu University [Masato Mori (Assistant Professor) Research Institute for Applied Mechanics, Division of Earth Environment Dynamics]

My research interests include atmospheric circulation variability that cause extreme weather events. We aim to understand climate variability and change by clarifying the mechanisms and predictability of atmospheric circulation variability and estimating (attribution) the impact of external factors such as global warming on that through climate diagnostics using reanalysis data and numerical experiments using dynamical models and global climate models.

Research

Research Interests

Atmosphere-Ocean-Sea Ice Interaction
keyword : Atmosphere-Ocean-Sea Ice coupling
2021.04.
Impacts of global warming-induced Arctic sea ice change on the mid-latitude atmosphere
keyword : Arctic sea ice variability, remote influence, global warming
2013.04.
Dynamics of the Pacific/North American Teleconnection Pattern
keyword : PNA, MJO, teleconnection, low-frequency variability, storm track
2002.04～2008.03.
Seasonal and near-term prediction of tropical cyclone activity over the Western North Pacific
keyword : tropical cyclone, seasonal prediction, near-term prediction, CGCM
2011.04～2013.03.
Understanding the formation mechanism of the atmospheric general circulation in the tropics using aqua planet experiments
keyword : aqua planet, superrotation, Hadley Circulation, Walker Circulation
2008.04～2010.03.

Academic Activities

Papers

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Masato Mori, Masahiro Watanabe, Hideo Shiogama, Jun Inoue, Masahide Kimoto, Robust Arctic sea-ice influence on the frequent Eurasian cold winters in past decades, NATURE GEOSCIENCE, 10.1038/NGEO2277, 7, 12, 869-873, 2014.12, Over the past decade, severe winters occurred frequently in mid-latitude Eurasia(1,2), despite increasing global- and annual-mean surface air temperatures(3). Observations suggest that these cold Eurasian winters could have been instigated by Arctic sea-ice decline(2,4), through excitation of circulation anomalies similar to the Arctic Oscillation(5). In climate simulations, however, a robust atmospheric response to sea-ice decline has not been found, perhaps owing to energetic internal fluctuations in the atmospheric circulation(6). Here we use a 100-member ensemble of simulations with an atmospheric general circulation model driven by observation-based sea-ice concentration anomalies to show that as a result of sea-ice reduction in the Barents-Kara Sea, the probability of severe winters has more than doubled in central Eurasia. In our simulations, the atmospheric response to sea-ice decline is approximately independent of the Arctic Oscillation. Both reanalysis data and our simulations suggest that sea-ice decline leads to more frequent Eurasian blocking situations, which in turn favour cold-air advection to Eurasia and hence severe winters. Based on a further analysis of simulations from 22 climate models we conclude that the sea-ice-driven cold winters are unlikely to dominate in a warming future climate, although uncertainty remains, due in part to an insufficient ensemble size..

Works, Software and Database

1.	[URL].
2.	[URL].

Presentations

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Membership in Academic Society

the Meteorological Society of Japan
Japan Geoscience Union

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