Researcher Information

OGAWA Fumiaki

Specially Appointed Assistant Professor

Climate and Midlatitude Oceanic Frontal Zones

Department of Earth and Planetary Sciences, Earth and Planetary Dynamics

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Theme

We aim to understand the formation and maintenance of stormtrack activities and jets in mid-latitudes and their low-frequency variability and future changes from the viewpoint of their interaction with the mid-latitude oceanic frontal zones.

FieldMeteorology, Climate dynamics
KeywordAtmospheric general circulation, Atmosphere-ocean interaction, Mid-latitude oceanic frontal zones, Stormtracks, Atmospheric jets

Introduction of Research

We are all familiar with the weather. Some days are sunny, some days are rainy, and some days are windy. Many of these weather phenomena in Japan are brought about by migratory high and low-pressure systems. On the other hand, many of them are driven by the jet stream expressed as the climatological mean state. Such migratory pressure systems and the jet stream maintain each other and exchange heat with the surface at the same time. Also, the jet stream drives the oceanic general circulation, such as the Kuroshio and Oyashio currents through friction at the sea surface. Therefore, to understand weather and climate and their future changes, it is necessary to consider the interaction with the ocean. Atmosphere-ocean interaction has been considered in the tropics and low latitudes, while it has been overlooked in the mid-latitudes. Recently, however, its importance in the mid-latitudes has been reconsidered. This is because cold and warm currents in the mid-latitudes, such as the Kuroshio and Oyashio, merge to form a steep SST gradient called the "ocean frontal zone." Such a mid-latitude ocean frontal zone is called the "hotspot of the climate system" because of the active heat exchange with the atmosphere. While the ocean currents that form the zone are driven by atmospheric circulation, the heat exchange contributes to the formation of migratory pressure systems and jet streams. My research focuses on these mid-latitude atmosphere-ocean interactions and aims to understand climate variability and future change through numerical simulations and data analysis.

Representative Achievements

Ogawa. F., T. Spengler: Prevailing Surface Wind Direction during Air-Sea Heat Exchange, Journal of Climate., 2019, 32, 5601-5617.
Omrani, N.-E., F., Ogawa, H. Nakamura, N. Keenlyside, S. Lubis, K. Matthes: Key Role of the Ocean Western Boundary currents in shaping the Northern Hemisphere climate. Scientific Reports, 2019, 9:3014.
Ogawa, F., H. Nakamura, K. Nishii, T. Miyasaka, A. Kuwano-Yoshida: Importance of mid-latitude oceanic frontal zones for the annular-mode variability: Inter-basin differences in the Southern Annular-Mode signature. Journal of Climate, 2016, 29, 6179-6199.
Ogawa, F., N.-E. Omrani, K. Nishii, H. Nakamura, N. Keenlyside: Ozone-induced climate changes propped up by the Southern Hemisphere oceanic front, Geophysical Research Letters, 2015, 42.
Ogawa, F., H. Nakamura, K. Nishii, T. Miyasaka, A. Kuwano-Yoshida: Dependence of the climatological axial latitudes of the tropospheric westerlies and storm tracks on the latitude of an extratropical oceanic front, Geophysical Research Letters, 2012, 39.

Related industries

Meteorology
Academic degreePh. D.
Self Introduction

I am from Shiga Prefecture. I spent 6 years working in Norway and then back to Japan in 2020 to work at this University.

Academic background2008 B.S., Earth and planetary physics, The University of Tokyo
2010 M.S., Earth and planetary science, The University of Tokyo
2014 Ph.D., Earth and planetary science, The University of Tokyo
2014 Postdoc, The University of Tokyo
2014 Postdoc, University of Bergen (Norway)
2016 Researcher, University of Bergen (Norway)
2019- Visiting Research Fellow, The University of Tokyo
2020- Specially-Appointed Assistant Professor, Hokkaido University
Affiliated academic societyMeteorological Society of Japan, Japan Geoscience Union, American Geophysical Union, European Geosciences Union
ProjectMid-latitude ocean-atmosphere interaction hotspots under the changing climate
Room addressScience Building 8 8-314