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Researcher Information

last modified:2020/04/02

Assistant Professor Takuya Sagawa

Laboratory Website

Faculty, Affiliation

Faculty of Geosciences and civil Engineering,Institute of Science and Engineering  Earth Science Course
Assistant Professor

College and School Educational Field

Division of Natural Sciences, Graduate School of Natural Science and Technology

Course in Earth and Planetary Science, School of Geosciences and Civil Engineering, College of Science and Engineering


Academic Background



Year & Month of Birth

Academic Society

Paleontological Society of Japan
The Geological Society of Japan
The Geochemical Society of Japan
Paleosciences Society
The Oceanographic Society of Japan
American Geophysical Union



Stratigraphy/Paleontology、Environmental dynamic analysis

Speciality Keywords

Paleoclimatology and Paleoceanography, Geochemistry

Research Themes

Long-term variation of water column structure in the western equatorial Pacific

Late Quaternary paleoceanography of the Japan Sea



  •  Equatorial Pacific seawater pCO2 variability since the last glacial period Kubota, K., Yokoyama, Y., Ishikawa, T., Sagawa, T., Ikehara, M., and Yamazaki, T.  Scientific Reports 9 2019/09/25
  •  Paleoceanographic evolution of the Japan Sea over the last 460 kyr - A coccolithophore perspective Saavedra-Pellitero, M., Baumann, K-H., Gallagher, SJ., Sagawa, T., and Tada, R. Marine Micropaleontology 152 2019/09/01
  •  Benthic Biotic Response to Climate Changes Over the Last 700,000 Years in a Deep Marginal Sea: Impacts of Deoxygenation and the Mid‐Brunhes Event Huai‐Hsuan M. Huang, Moriaki Yasuhara, Hokuto Iwatani, Carlos A. Alvarez-Zarikian, Maria‐Angela Bassetti, Takuya Sagawa Paleoceanography and Paleoclimatology 2018/06/25
  •  Construction of perfectly continuous records of physical properties for dark-light sediment sequences collected from the Japan Sea during Integrated Ocean Drilling Program Expedition 346 and their potential utilities as paleoceanographic studies Tomohisa Irino, Ryuji Tada, Ken Ikehara, Takuya Sagawa, Akinori Karasuda, Shunsuke Kurokawa, Arisa Sek, Song Lu Progress in Earth and Planetary Science 5 23 2018/04/19
  •  High-resolution and high-precision correlation of dark and light layers in the Quaternary hemipelagic sediments of the Japan Sea recovered during IODP Expedition 346 Tada R, Irino T, Ikehara K, Karasuda A, Sugisaki S, Xuan C, Sagawa T, Itaki T, Kubota Y, Lu S, Seki A, Murray RW, Alvarez-Zarikian C, Anderson WT, Bassetti M-A, Brace BJ, Clemens SC, da Costa Gurgel MH, Dickens GR, Dunlea AG, Gallagher SJ, Giosan L, Henderson ACG, Holbourn AE, Kinsley CW, Lee GS, Lee KE, Lofi J, Lopes CICD, Saavedra-Pellitero M, Peterson LC, Singh RK, Toucanne S, Wan S, Zheng H, Ziegler M Progress in Earth and Planetary Science 5 19 2018/03/26 

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  •  East Asian Monsoon History and Paleoceanography of the Japan Sea Over the Last 460,000 Years Stephen J. Gallagher, Takuya Sagawa, Andrew C. G. Henderson, Mariem Saavedra‐Pellitero, David De Vleeschouwer, Heather Black, Takuya Itaki, Sam Toucanne, Maria‐Angela Bassetti, Steve Clemens, William Anderso, Carlos Alvarez‐Zarikian, Ryuji Tada  Paleoceanography and Paleoclimatology 2018/06/13
  •  Integrated tephrostratigraphy and stable isotope stratigraphy in the Japan Sea and East China Sea using IODP Sites U1426, U1427, and U1429, Expedition 346 Asian Monsoon Sagawa T, Nagahashi Y, Satoguchi Y, Holbourn A, Itaki T, Gallagher SJ, Saavedra-Pellitero M, Ikehara K, Irino T, Tada R Progress in Earth and Planetary Science 5 18 2018/03/22 
  •  A deep-sea agglutinated foraminifer tube constructed with planktonic foraminifer shells of a single species Paul N. Pearson and IODP Expedition 363 Shipboard Scientific Party J. Micropalaeontol. 37 97-104 2018/01/05 
  •  Multidecadal, centennial, and millennial variability in sardine and anchovy abundances in the western North Pacific and climate–fish linkages during the late Holocene Kuwae M, Yamamoto M, Sagawa T, Ikehara K, Irino T, Takemura K, Takeoka H, Sugimoto T Progress in Oceanography 159 86-98 2017/09 
  •  Evolution of the North Pacific Subtropical Gyre during the past 190 kyr through the interaction of the Kuroshio Current with the surface and intermediate waters Yurika Ujiié, Hirofumi Asahi, Takuya Sagawa, Franck Bassinot Paleoceanography 31 11 1498-1513 2016/11/15 
  •  Solar forcing of centennial-scale East Asian winter monsoon variability in the mid- to late Holocene Sagawa T., Kuwae M., Tsuruoka K., Nakamura Y., Ikehara M., and Murayama M. Earth and Planetary Science Letters 395 124-135 2014/04/09 
  •  Seasonal variations in planktonic foraminiferal flux and oxygen isotopic composition in the western North Pacific: Implications for paleoceanographic reconstruction Sagawa T., Kuroyanagi A., Irino T. Kuwae M. and, Kawahata H. Marine Micropaleontology 100 11-20 2013/04/06 
  •  Stratigraphy and wiggle-matching-based age-depth model of late Holocene marine sediments in Beppu Bay, southwest Japan Kuwae M., Yamamoto M., Ikehara K., Irino T., Takemura K., Sagawa T., Sakamoto T., Ikehara M., Takeoka H. Journal of Asian Earth Sciences 69 133-148 2012/06/16 
  •  Shoaling of the western equatorial Pacific thermocline during the last glacial maximum inferred from multispecies temperature reconstruction of planktonic foraminifera Sagawa T., Yokoyama Y., Ikehara M., Kuwae M. Palaeogeography, Palaeoclimatology, Palaeoecology 346-347 120-129 2012/06/12 
  •  Ventilation changes in the western North Pacific since the last glacial period Y. Okazaki, T. Sagawa, H. Asahi, K. Horikawa, J. Onodera Climate of the Past 8 17-24 2012/01/03 
  •  Limits on conservative behavior of Nd isotopes in seawater assessed from analysis of fish teeth from Pacific core tops Horikawa K., Martin E.E., Asahara Y., Sagawa T. Earth and Planetary Science Letters 310 1-2 119-130 2011/08/16 
  •  Vertical thermal structure history in the western subtropical North Pacific since the last glacial maximum Sagawa T., Yokoyama Y., Ikehara M., Kuwae M Geophysical Research Letters 38 L00F02 2011/01/11 
  •  Latitudinal and downcore (0-750 ka) changes in n-alkane chain lengths in the eastern equatorial Pacific Horikawa K., Murayama M., Minagawa M., Kato Y., Sagawa T. Quaternary Research 73 3 573-582 2010/02/12 
  •  Mg/Ca thermometry of planktonic foraminifera and application to paleoceanography Journal of Geological Society of Japan 116 2 63-84 2010/02 
  •  Intermediate water ventilation change in the subarctic northwest Pacific during the last deglaciation Sagawa T., Ikehara K. Geophysical Research Letters 35 L24702 2008/12/18 
  •  Interlaboratory comparison study of calibration standards for foraminiferal Mg/Ca thermometry Greaves et al. Geochemistry Geophysics Geosystems (G-cubed)  9 Q08010 2008/08/19 
  •  Sea surface temperature record off central Japan since the Last Glacial Maximum using planktonic foraminiferal Mg/Ca thermometry Sagawa T., Toyoda K., Oba T. Journal of Quaternary Science 21 1 63-73 2005/08/09 

Conference Presentations

Arts and Fieldwork


Theme to the desired joint research

Grant-in-Aid for Scientific Research


Classes (Bachelors)

○Geological Filed Trip 2(2017)
○Earth Environment(2017)
○Seminar on Earth Science 1(1)(2017)
○Seminar on Earth Science 1(2)(2017)
○Applied Treatment of Geological Materials(2017)
○Earth Sciences for Education(2017)
○Seminar on Earth Science 2(1)(2017)
○Seminar on Earth Science 2(2)(2017)
○Geological Field Work B(2017)
○Earth Environment(2017)
○Earth Sciences for Education(2017)
○Earth Sciences for Education(2017)
○Treatment of Geological Materials(2017)
○Practice in Geology(2017)
○Practice in Geology(2017)
○Methods for Geological Field Work(2017)
○Pale ontological Experiments(2017)
○Earth Environment(2016)
○Treatment of Geological Materials(2016)
○Applied Treatment of Geological Materials(2016)
○Methods for Geological Field Work(2016)
○Geological Field Work B(2016)
○Pale ontological Experiments(2016)
○Earth Sciences for Education(2016)
○Earth Environment(2016)
○Geological Filed Trip 2(2016)
○Earth Sciences for Education(2016)
○Seminar on Earth Science 2(2)(2016)
○Seminar on Earth Science 2(1)(2016)
○Earth Sciences for Education(2016)
○Seminar on Earth Science 1(2)(2016)
○Seminar on Earth Science 1(1)(2016)

Classes (Graduate Schools)

○Evolution of Earth Environments B(2017)
○Evolution of Earth Environments A(2017)
○Evolution of Earth Environments A(2016)
○Evolution of Earth Environments B(2016)

International Project

International Students

Lecture themes

Others (Social Activities)

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