Kyushu University Academic Staff Educational and Research Activities Database
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Atsuhiko Isobe Last modified date:2019.06.27

Graduate School

Academic Degree
Field of Specialization
Physical Oceanography, Coastal Oceanography
Outline Activities
Please visit our web site for detailed descriptions including my publication list. My recent research interests are as follows:
Dynamics of continental shelf and coastal circulation, with a focus on observational and numerical studies on Yelllow & East China Seas, and Seto Inland Sea. Atmosphere-ocean interaction in marginal seas and coastal oceans. Marine plastic debris, especially on transport and formation processes of marine micro-plastics.

Ocean dynamics at Dept. of Earth System Science & Tech., Works with students in Master& Doctor courses of Dept.ESST.
Research Interests
  • Dynamics of continental shelf and coastal circulation, with a focus on observational and numerical studies on Yelllow & East China Seas, and Seto Inland Sea. Atmosphere-ocean interaction in marginal seas and coastal oceans. Marine plastic debris, especially on transport and formation processes of marine micro-plastics.
    keyword : ocean circulation in shelf and coastal waters, atmosphere-ocean interaction, marine plastic debris, microplastics
    2006.04Please see my Web site (URL is shown above).
Current and Past Project
  • microplastic research
  • The project will focus on three main areas of research:
    (1) Surveillance and monitoring of tsunami-generated marine debris landfall;
    (2) Modeling movement of marine debris in the North Pacific; and
    (3) Risk (including potential impacts) from invasive species to coastal ecosystems.
  • Over the East Asian marginal seas including the Sea of Okhotsk, we are able to find complex ocean processes such as oceanic fronts associated with Kuroshio and Tsushima Currents, sub-mesoscale eddies of which horizontal scales are less than 100 km, and sea ice production. Our research objectives are to investigate how atmospheric processes with the synoptic/mesoscale scales (say, development of extratropical cyclones) are influenced by these ocean processes with relatively smaller spatial scales. In addition, our focuses are placed on whether the atmospheric processes altered above marginal seas again influence marginal seas. Do atmosphere-ocean coupled processes actually occur even in relatively narrow marginal seas?
  • Kuroshio:State estimate and prediction
Academic Activities
1. Atsuhiko Isobe, Sinsuke Iwasaki, Keiichi Uchida, and Tadashi Tokai, Abundance of non-conservative microplastics in the upper ocean from 1957-2066, Nature Communications, 10.1038/s41467-019-08316-9, 10, 417, 2019.01, 海を漂流・漂着するプラスチックごみは、時間が経つにつれて劣化し破砕を繰り返しながら、次第にマイクロプラスチック(MP)と呼ばれる微細片となり、漂流の過程で誤食を介して海洋生物に取り込まれることが知られている。MPによる海洋汚染を調査している九州大学と東京海洋大学、そして寒地土木研究所の研究者は、過去から現在までに観測されたMP浮遊量をコンピュータ・シミュレーションで再現し、さらに50年先までの太平洋全域における浮遊量を予測した。特に日本周辺や北太平洋中央部において夏季の浮遊量が多くなる特徴があること、プラスチックの海洋への流出がこのまま増え続けた場合、これら海域では2030年までに海洋上層での重量濃度が現在の約2倍になること、2060年までには約4倍となることが示され、将来海洋生物へのMPの環境リスクに直面する可能性のある海域として注意すべきことがわかった。ただし、MPによる海洋生物への影響を指摘したこれまでの実験研究では、観測やシミュレーションの対象となったMP(>300μm)よりも一桁から四桁以上小さなMPを使用している。今後は、実験で用いているほど小さな粒径にまで微細化したMPを実海域で監視し、浮遊量の将来を予測することが、海洋生物への影響を考える上で重要であろう。.
2. Young Kyoung Song, Sang Hee Hong, Soeun Eo, Mi Jang, Gi Myung Han, Atsuhiko Isobe, Won Joon Shim, Horizontal and Vertical Distribution of Microplastics in Korean Coastal Waters, Environmental Science & Technology, 10.1021/acs.est.8b04032, 52, 21, 12188-12197, 2018.11.
3. Iwanaka, Y., and A. Isobe, Tidally induced instability processes suppressing rive plume spread in a nonrotating and nonhydrostatic regime, Journal of Geophysical Research -Oceans, 123, 3545-3562, 2018.06.
4. Zhao Ning, Iwasaki, S, M. Yamamoto, and A. Isobe, Modulation of Extratropical Cyclones by Previous Cyclones via the Sea Surface Temperature Anomaly over the Sea of Japan in Winter, Journal of Geophysical Research -Atmospheres, 123, 6312-6320, 2018.06.
5. Kako, S., A. Isobe, T. Kataoka, K. Yufu, S. Sugizono, C. Plybon, and T. A. Murphy, Sequential webcam monitoring and modeling of marine debris abundance, Marine Pollution Bulletin, in press, 2018.06.
6. Tomoya Kataoka, Cathryn Clarke Murray, Atsuhiko Isobe, Quantification of marine macro-debris abundance around Vancouver Island, Canada, based on archived aerial photographs processed by projective transformation, Marine Pollution Bulletin, 10.1016/j.marpolbul.2017.08.060, 132, 44-51, 2018.07.
7. Shinsuke Iwasaki, Atsuhiko Isobe, Shin'ichiro Kako, Keiichi Uchida, Tadashi Tokai, Fate of microplastics and mesoplastics carried by surface currents and wind waves -A numerical model approach in the Sea of Japan, Marine Pollution Bulletin, 10.1016/j.marpolbul.2017.05.057, 121, 1-2, 85-96, 2017.01.
8. Miyao, Y. and A. Isobe, An attempt to visualize coastal oceanic features using an infrared camera suspended by a balloon, Journal of The Remote Sensing Society of Japan, 37, 112-123, 2017.06.
9. Atsuhiko Isobe, Kaori Uchiyama-Matsumoto, Keiichi Uchida, Tadashi Tokai, Microplastics in the Southern Ocean, Marine Pollution Bulletin, 10.1016/j.marpolbul.2016.09.037, 114, 1, 623-626, 2017.10, 東京海洋大学の練習船で調査を行い、世界で初めて南極海で浮遊マイクロプラスチックを発見した。.
10. Atsuhiko Isobe, Percentage of microbeads in pelagic microplastics within Japanese coastal waters, Marine Pollution Bulletin, 10.1016/j.marpolbul.2016.06.030, 110, 1, 432-437, 2016.09.
11. Atsuhiko Isobe, Keiichi Uchida, Tadashi Tokai, Shinsuke Iwasaki, East Asian seas: A hot spot of pelagic microplastics, MARINE POLLUTION BULLETIN, 10.1016/j.marpolbul.2015.10.042, 101, 2, 618-623, 2015.12.
12. Atsuhiko Isobe, K. Kubo, Y. Tamura, S. Kako, E. Nakashima, N. Fujii, Selective transport of microplastics and mesoplastics by drifting in coastal waters, Marine Pollution Bulletin, 89, 324-330, 2014.11.
13. Atsuhiko Isobe, S. Kako, S. Iwasaki, Synoptic scale atmospheric motions modulated by spring phytoplankton bloom in the Sea of Japan, Journal of Climate, 27, 7587-7602, 2014.10.
14. Kenki Kasamo, Atsuhiko Isobe, S. Minobe, A. Manda, H. Nakamura, K. Ogata, H. Nishikawa, Y. Tachibana, S. Kako, Transient and local weakening of surface winds observed above the Kuroshio front in the winter East China Sea, Journal of Geophysical Research -Atmospheres, doi:10.1002/2013JD020610, 119, 1277-1291, 2014.05.
15. Yasuyuki Miyao, Atsuhiko Isobe, S. Kako, An application of low-altitude remote sensing using a vessel-towed balloon for monitoring jellyfish patchiness in coastal waters, Journal of The Remote Sensing Society of Japan, 34, 2, 113-120, 2014.04.
16. Shin'ichiro Kako, Atsuhiko Isobe, T. Kataoka, H. Hinata, A decadal prediction of the quantity of plastic marine debris littered on beaches of the East Asian marginal seas, Marine Pollution Bulletin, 81, 174-184, 2014.04.
17. Shinsuke Iwasaki, Atsuhiko Isobe, Shin'ichiro Kako, Atmosphere-ocean coupled process along coastal areas of the Yellow and East China Seas in winter, Journal of Climate, 27, 1, 155-167, 2014.01.
18. Etsuko Nakashima, Atsuhiko Isobe, Shin'ichiro kako, T. Itai, S. Takahashi, Quantification of toxic metals derived from macroplastic litter on Ookushi beach, Japan, Environmental Science & Technology, DOI: 10.1021/es301362g, 46, 10099-10105, 2012.10.
19. Atsuhiko Isobe, Shin'ichiro Kako, A role of the Yellow and East China Seas in the development of extratropical cyclones in winter, Journal of Climate, doi:, 25, 8328-8340, 2012.08.
20. Atsuhiko Isobe, Shin'ichiro Kako, X. Guo, H. Takeoka, Ensemble numerical forecasts of the sporadic Kuroshio-water intrusion (kyucho) into shelf and coastal waters, Ocean Dynamics, 62, 633-644, 2012.07.
21. Shin'ichiro Kako, Atsuhiko Isobe, Sinya Magome, Low altitude remote-sensing method to monitor marine and beach litter of various colors using a balloon equipped with a digital camera, Marine Pollution Bulletin, 64, 1156-1162, 2012.06.
22. Shin'ichiro Kako, Atsuhiko Isobe, M. Kubota, High-resolution ASCAT wind vector data set gridded by applying an optimum interpolation method to the global ocean, Journal of Geophysical Research -Atmospheres, doi:10.1029/2010JD015484, 116, D23107, 2011.02.
Works, Software and Database
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Membership in Academic Society
  • American Geophysical Union
  • American Meteorological Scociety
Educational Activities
Dept.ESST/Seminar on Dynamics of Ocean Variability