• Quaternary Paleoceanography in the North Pacific and marginal seas
• Past Ocean Circulation through the Glacial-Interglacial time scale
• Paleoceanographic Evolution of the Western Pacific Warm Pool
• Holocene Climate Variability in the East Asian Monsoon Region
• Development of Paleoceanographic Proxies using Foraminiferal tests

Paleoceanography, Foraminifera, North Pacific, Cenozoic, Stable Isotopes, Trace Elements

2005　Postdoctoral Researcher, Graduate School of Environmental Earth Science, Hokkaido University, Japan
2006　Postdoctoral Fellow, Center for Advanced Marine Core Reseach, Kochi University, Japan
2009　Postdoctoral Fellow, Senior Research Fellow Center, Ehime University, Japan
2013　Postdoctoral Fellow, Center for Marine Environmental Studies, Ehime University, Japan
2013　Research Assistant Professor, Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University, Japan
2015　Assistant Professor, Faculty of Natural System, Institute of Science and Engineering, Kanazawa University, Japan

Membership

• The Oceanographic Society of Japan (2003-)
• American Geophysical Union (2004-)
• The Geochemical Society of Japan (2007-)
• The Geological Society of Japan (2009-)
• Palaeontological Society of Japan (2010-)
• Paleo10: Paleosciences Society (2013-)

• KR15-10: Southern Japan Sea (2015/6/30-7/10)　　photo
• IODP Expedition 346 "Asian Monsoon": Japan Sea & East China Sea (2013/7/28-9/28)　　photo
• KT10-5: Off Shimokita Peninsula & Funka Bay, East Coast of Japan (2010/4/18-22)　　photo
• KT09-8: Off Shimokita Peninsula, East Coast of Japan (2009/5/30-6/9)　　photo
• KT09-1: Beppu Bay, Seto Inland Sea (2009/3/7-10)　　photo
• KT08-10: East China Sea (2008/5/24-29)　　photo
• KR07-12: East China Sea & Japan Sea (2007/9/8-25)　　photo
• KT07-19: Off Shikoku island, Northwestern North Pacific (2007/8/4-10)　　photo
• KH06-3: Kyusyu-Palau Ridge & Amami Seamount, Northwestern North Pacific (2006/9/28-10/21)　　　photo
• KR02-15: Northwestern North Pacific (2002/11/17-12/6)　　photo
• GH00: Okhotsk Sea (2000/8/3-8/16)
• MR00-K05: Northwestern North Pacific(2000/7/9-8/1)

• Huang, H-H., Yasuhara, M., Iwatani, H., Alvarez-Zarikian, C., Bassetti, M-A., and Sagawa, T. (2018) 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, Paleoceanography and Paleoclimatology, doi:10.1029/2018PA003343. [Link]
• Gallagher, SJ., Sagawa, T., Henderson, A., Saavedra-Pellitero, M., de Vleeschouwer, D., Black, H., Itaki, T., Toucanne, S., Bassetti, M-A., Clemens, S., Anderson, W., Alvarez-Zarikian, C., and Tada, R. (2018) East Asian monsoon history and paleoceanography of the Japan Sea over the last 460,000 years, Paleoceanography and Paleoclimatology, doi:10.1029/2018PA003331. [Link]
• Itaki, T., Sagawa, T., and Kubota, Y. (2018) Pleistocene radiolarian biostratigraphy, IODP Expedition 346 Site U1427, Proceedings of the Intergrated Ocean Drilling Program, 346: doi:10.2204/iodp.proc.346.202.2018. [Link]
• Irino, T., Tada, R., Ikehara, K., Sagawa, T., Karasuda, A., Kurokawa, S., Seki, A., and Lu, S. (2018) 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, Progress in Earth and Planetary Science, 5: 23. [Link]
• Tada, R., et al. (2018) 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, Progress in Earth and Planetary Science, 5: 19. [Link]
• Sagawa, T., Nagahashi, Y., Satoguchi, Y., Holbourn, A., Itaki, T., Gallagher, SJ., Saavedra-Pellitero, M., Ikehara, K., Irino, T., Tada, R.. (2018) 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, Progress in Earth and Planetary Science, 5: 18. [Link]
• Pearson, O., and IODP Expedition 363 Shipboard Scientific Party. (2018) A deep-sea agglutinated foraminifer tube constructed with planktonic foraminifer shells of a single, Journal of Micropaleontology, 37: 97-104. [Link]
• Kuwae, M., Yamamoto, M., Sagawa, T., Ikehara, K., Irino, T., Takemura, K., Takeoka, H., and Sugimoto, T. (2017) Multidecadal, centennial, and millennial variability in sardine and anchovy abundances in the western North Pacific and climate-fish linkages during the late Holocene, Progress in Oceanography, 159: 86-98. [Link]
• Ujiie, Y., Asahi, H., Sagawa, T., and Bassinot, F. (2016) 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, Paleoceanography, 31: 1498-1513. [Link]
• Sagawa, T., Kuwae, M., Tsuruoka, K., Nakamura, Y., Ikehara, M., and Murayama, M. (2014) Solar forcing of centennial-scale East Asian winter monsoon variability in the mid- to late Holocene, Earth and Planetary Science Letters, 395: 124-135. [Link]
• Sagawa, T., Kuroyanagi, A., Irino, T., Kuwae, M., and Kawahata, H. (2013) Seasonal variations in planktonic foraminiferal flux and oxygen isotopic composition in the western North Pacific: implications for paleoceanographic reconstruction, Marine Micropaleontology, 100: 11-20. [Link]
• Kuwae, M., Yamamoto, M., Ikehara, K., Irino, T., Takemura, K., Sagawa, T., Sakamoto, T., Ikehara, M., and Takeoka, H. (2013) Stratigraphy and wiggle-matching-based age-depth model of late Holocene marine sediments in Beppu Bay, southwest Japan, Journal of Asian Earth Sciences, 69: 133-148. [Link]
• Sagawa, T., Yokoyama, Y., Ikehara, M., and Kuwae, M. (2012) Shoaling of the western equatorial Pacific thermocline during the last glacial maximum inferred from multispecies temperature reconstruction of planktonic foraminifera, Palaeogeography, Palaeoclimatology, Palaeoecology, 346-347: 120-129.[Link]
• Okazaki, Y., Sagawa, T., Asahi, H., Horikawa, K., and Onodera, J. (2012) Ventilation changes in the western North Pacific since the last glacial period. Climate of the Past, 8: 17-24. [Link]
• Horikawa, K., Martin, EE., Asahara, Y., and Sagawa, T. (2011) Limits on conservative behaviour of Nd isotopes in seawater assessed from analysis of fish teeth from Pacific core tops, Earth and Planetary Science Letters, 310:119-130. [Link]
• Sagawa, T., Yokoyama, Y., Ikehara, M., and Kuwae, M. (2011) Vertical thermal structure history in the western subtropical North Pacific since the last glacial maximum, Geophysical Research Letters, 38, L00F02, doi:10.1029/2010GL045827. [PDF Download@AGU Please Enter Pass&ID:22605461]
• 佐川拓也 (2010) 浮遊性有孔虫殻Mg/Ca古水温計の現状・課題とその応用例, 地質学雑誌, 116(2): 63-84. [PDF Download@J-Stage]
• Horikawa, K., Murayama, M., Minagawa, M., Kato, Y., and Sagawa, T. (2010) Latitudinal and downcore (0-750 ka) changes in n-alkane chain lengths in the eastern equatorial Pacific, Quaternary Research, 73: 573-582. [Link]
• Sagawa, T. and Ikehara, K. (2008) Intermediate water ventilation change in the subarctic Northwest Pacific during the last deglaciation, Geophysical Research Letters, 35, L24702, doi:10.1029/2008GL035133. [PDF Download@AGU Please Enter Pass&ID:33583520]
• Greaves et al. (2008) Interlaboratory comparison study of calibration standards for foraminiferal Mg/Ca thermometry, Geochemistry Geophysics Geosystems (G-cubed), 9(8): doi:10.1029/2008GC001974. [Link]
• Sagawa, T., Toyoda, K., and Oba, T. (2006) Sea surface temperature record off central Japan since the Last Glacial Maximum using planktonic foraminiferal Mg/Ca thermometry, Journal of Quaternary Science, 21(1): 63-73. [Link]