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157 labs · 25 student voices
Faculties at Hokkaido University ›
Shin Sugiyama, Professor
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The Arctic Research Unit aims to clarify environmental change in Arctic physical oceanography, sea ice environments, the cryosphere, and climate. In the Arctic, temperatures are rising at a rate said to be four times the global average, and sea ice, glaciers and ice sheets, and permafrost are melting. These changes have major effects on marine and terrestrial life, and are also a cause of extreme weather such as the heavy snowfall and extreme heat that occur frequently in Japan. At the Arctic Research Center, the unit assesses the current state and makes future projections using diverse approaches such as field surveys, analysis of satellite data, and numerical modeling.
Ken Sawada, Professor
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The Biological and Organic Geochemistry Lab conducts research aimed at clarifying the evolution and changes of the Earth's biosphere over geological timescales. Focusing mainly on strata (sediments) and fossils, the lab combines organic chemical analysis with geoscience field surveys. From these, the lab reconstructs past global environments and ecosystems, and seeks to clarify long-term environmental change and material cycling systems. The lab welcomes students who are strong in chemistry or geology and are interested in the history of life on Earth and in environmental and climate change.
Masashi Ikeda, Assistant Professor
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The Ikeda Lab studies past organisms and environments using molecular fossils (biomarkers) and organic-walled microfossils preserved in sediments. Focusing mainly on land-dwelling organisms, the lab works on reconstructing past ecosystems, changes in past environments, and the history of life on Earth. Using materials such as Cretaceous sedimentary rocks distributed in Hokkaido, the lab carries out field surveys and laboratory analyses.
Tsuyoshi Watanabe, Lecturer
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The Coral Reef Global Environmental Science Lab studies variability in tropical and subtropical climate and marine environments, using coral reefs as its main field site. Its main clues are calcium carbonate produced by living organisms (biogenic carbonates), such as coral skeletons and shells. Analyzing chemical composition along the growth bands recorded in a skeleton makes it possible to estimate the environment at the time the skeleton formed. The lab also examines how organisms such as corals and bivalves have responded and adapted to environmental change.
Takeshi Horinochi, Professor
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The Horinochi Lab studies atmospheric phenomena across a range of time scales and how they relate to climate. Through numerical simulation and analysis of observational data, it seeks reliable knowledge about weather and climate. Its subjects range widely, from typhoons and East Asian precipitation to the atmosphere of Venus. Graduate education is provided across the whole Atmospheric and Oceanic Physics and Climate Dynamics course.
Masatomo Fujiwara, Professor
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Prof. Fujiwara specializes in atmospheric science and studies how substances are transported through the atmosphere and climate change caused by volcanic eruptions. Prof. Fujiwara has also worked on developing and evaluating observation instruments carried on rubber balloons, such as water vapor sondes and cloud particle sondes. Internationally, the lab is deeply involved in activities to evaluate climate data and in research on observation networks for climate change. Since 2022, the lab has also begun routine ozone layer observations in Sapporo.
Hiroyuki Tomita, Associate Professor
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The Tomita Lab studies air–sea interaction, in which the atmosphere and the ocean meet at the sea surface and influence each other. The heat, momentum, water, and other quantities exchanged between the atmosphere and the ocean are called sea surface fluxes, and quantifying them is the core of the lab's research. The lab mainly uses techniques that estimate sea surface fluxes on a global scale based on satellite observations. Established in FY2021, the lab carries out research spanning meteorology, oceanography, and climatology.
Genta Mizuta, Assistant Professor
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Assistant Professor Genta Mizuta studies the dynamical mechanisms that sustain the large-scale circulation of the ocean. Using simplified numerical models and similar tools, Mizuta has theoretically investigated how idealized seafloor topography affects the deep circulation. Recently, Mizuta has also become interested in studying ocean circulation using observational data. Graduate education is provided jointly by the faculty members of the Atmospheric and Oceanic Physics and Climate Dynamics course.
Yoichi Tanimoto, Professor
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The Tanimoto Lab mainly studies air–sea interaction, a field spanning meteorology and physical oceanography. Its methods include meteorological observations over the ocean, analysis of satellite and ship observation data, numerical simulations with atmospheric models, and analysis of climate models. From these various angles, the lab investigates how the ocean affects weather and climate. In the course, students learn meteorology, oceanography, and fluid dynamics from the basics in the first half of the master's program, so students can start even without having studied earth science as undergraduates.
Yoshio Kawatani, Associate Professor
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The Kawatani Lab studies atmospheric phenomena from the surface up to an altitude of 80 km from a dynamical perspective. It focuses in particular on the interactions between the troposphere and the stratosphere and mesosphere above it (the middle atmosphere). The lab combines numerical simulations with climate models and analysis of model experiment data from around the world, as well as various observational and reanalysis datasets. It also conducts research on tropospheric phenomena such as the Baiu front and the Pacific High (North Pacific Subtropical High), and on how they will change in the future.
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