• 2022.4 - present: Senior Researcher, Lake Biwa Environmental Research Insitutite (LBERI), Japan

• 2017.7 - 2022.3: Researcher, Lake Biwa Environmental Research Insitutite (LBERI), Japan

• 2016.4 - 2017.6: Research Fellow, Atmosphere and Ocean Research Institute, The University of Tokyo, Japan (Toshi Nagata Lab)

• 2013.6 - 2014.12: Research Scholar, Ocean Sciences Department, University of California, Santa Cruz, US (Matthew McCarthy Lab)

• 2013.4 - 2016.3: JSPS Research Fellow PD, Department of Earth and Planetary Sciences, The University of Tokyo, Japan (Yohey Suzuki Lab)

• 2008.4 - 2013.3: Research student, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Japan (Naohiko Ohkouchi Lab)

• 2008.4 - 2013.3: Graduate studies at Department of Earth and Planetary Sciences, Graduate School of Science, The University of Tokyo, Japan (Yusuke Yokoyama Lab)

• 2006.4 - 2008.3: Undergraduate studies at the Department of Earth and Planetary Environmental Sciences, School of Science, The University of Tokyo, Japan

• 2003.4 - 2006.3: College of Arts and Sciences, The University of Tokyo, Japan

• 1997.4 - 2003.3: Tokai Junior and Senior High School, Japan

• 1984.12: Born in Nagoya, Japan

• 2013.3: Ph.D.: The University of Tokyo, Advisers: Yusuke Yokoyama and Naohiko Ohkouchi, Thesis title: "Biogeochemical Dynamics of Amino Acids in Marine Sediments: Constraints from Compound-Specific Nitrogen Isotopic Composition and D/L Ratio"

• 2010.3: M.Sc.: The University of Tokyo, Advisers: Yusuke Yokoyama and Naohiko Ohkouchi, Thesis title: "Nitrogen isotopic signatures of amino acids in Eukarya, Bacteria, and Archaea: a novel tool in biogeochemistry"

• 2008.3: B.Sc.: The University of Tokyo, Adviser: Yusuke Yokoyama, Thesis title: "Northern hemisphere climate changes induced by the galactic cosmic ray variations during the Maunder Minimum" (in Japanese)

Fellowships

• 2013.4 - 2016.3: JSPS Research Fellow PD (Japan Society for the Promotion of Science), at The University of Tokyo, Japan & at University of California, Santa Cruz, US

• 2010.4 - 2013.3: JSPS Research Fellow DC1 (Japan Society for the Promotion of Science), at The University of Tokyo, Japan

Academic Honors and Awards

• 2018.8: Taguchi Award (award for an early-career scientist), The Japanese Association of Organic Geochemists

• 2012.9: Oral Presentation Award, 2012 Youth Symposium for Japanese geochemists, Fukuoka, Japan

• 2010.8: Poster Award, 28th Symposium for Japanese Organic Geochemists, Nagaoka, Japan

• 2010.3: Award for Best M.Sc. Thesis, Department of Earth and Planetary Sciences, The University of Tokyo, Japan

• 2009.9: Poster Award, 19th International Symposium on Environmental Biogeochemistry, Humburg, Germany

• 2008.9: Best Poster Award, 2008 Youth Symposium for Japanese geochemists, Tokyo, Japan

• 2008.3: Dean’s Award for B.Sc. Students, School of Sciences, The University of Tokyo, Japan

• 2008.3: Award for Best B.Sc. Students, Department of Earth and Planetary Environmental Sciences, The University of Tokyo, Japan

2020

• R/V Biwakaze - Sampling of POM and DOM at Lake Biwa, Japan (total: 11 days)

2019

• R/V Biwakaze - Sampling of POM and DOM at Lake Biwa, Japan (total: 11 days)

2018

• R/V Biwakaze - Sampling of POM and DOM at Lake Biwa, Japan (total: 7 days)

2017

• R/V Biwakaze - Sampling of POM and DOM at Lake Biwa, Japan (total: 3 days)

2016

• R/V Yayoi and R/V Grand Maillet - Sampling of seawater POM and sediments at Otsuchi Bay, Japan (2016.5: 1 day)

2014

• R/V Kilo Moana, KM14-18 - Sampling of seawater POM and DOM at Station ALOHA in the North Pacific Subtropical Gyre (2014.8-9: 15 days)

• Sampling of seawater DOM at GCMPSL (Granite Canyon Marine Pollution Studies Lab), California, US (2014.5)

• R/V Kilo Moana, KM14-07 - Sampling of seawater POM and DOM at Station ALOHA in the North Pacific Subtropical Gyre (2014.2: 12 days)

2010

• D/V JOIDES Resolution, IODP (Integrated Ocean Drilling Program) Exp. 329 "South Pacific Gyre Subseafloor Life" - Sampling of deep subseafloor sediments in the South Pacific Gyre (2010.10-12: 66 days)

2009

• D/V Chikyu, CK09-05 (Exp. 905) - Sampling of deep subseafloor sediments in the Sagami Trough, Pacific (2009.12: 15 days)

• D/V Chikyu, CK09-01 (Exp. 903, Leg 1) - Sampling of deep subseafloor sediments at the Kumano Mud Volcano No. 5 in the Nankai Trough, Pacific (2009.3: 15 days)

...156 days at sea and at lakes in total

Principal Investigator 

• 2024.4 - 2027.3: Exploring the potential of bacteria-derived submicron particles to drive biological pumps, JSPS Grant-in-Aid for Scientific Research (B). KAKENHI 24K03078, 18,590,000 JPY.

• 2021.4 - 2024.3: Microbial Nitrogen Pump: Bacterial semi-labile dissolved organic nitrogen as a nutrient transport pathway in aquatic systems, JSPS Grant-in-Aid for Scientific Research (B). KAKENHI 21H03584, 17,290,000 JPY.

• 2018.4 - 2023.3: Development of high-precision nitrogen isotope analysis as a new index of dissolved organic matter sources in aquatic environments, JSPS Grant-in-Aid for Early-Career Scientists, KAKENHI 18K18189, 4,030,000 JPY.

• 2018.4 - 2019.3: Bacterial contribution to dissolved organic matter pools in lakes: Development of a quantification method using enantiomeric biomarkers, Lake Biwa-Yodo River Water Quality Preservation Organization. 800,000 JPY.

• 2013.4 - 2016.3: Development of sedimentary ancient DNA analysis to study variability of biogeochemical cycles in the past ocean, Grant-in-Aid for JSPS Research Fellowship for Young Scientists, KAKENHI 13J10453, 3,960,000 JPY.

• 2010.4 - 2013.3: Development and application of compound-specific nitrogen isotope analysis of amino acids to study biogeochemical cycles in deep subseafloor environments, Grant-in-Aid for JSPS Research Fellowship for Young Scientists, KAKENHI 10J06167, 2,100,000 JPY.

Co-Investigator

• 2024.3 - 2027.3: Reconstruction of a size-reaction continuum model of dissolved organic matter in the aquatic environments focusing on the relationship between molecular size and chemical composition,  JSPS Grant-in-Aid for Scientific Research (C), KAKENHI 24K15283. (PI: Kazuhide Hayakawa @ LBERI)

• 2023.10 - 2029.3: Developing efficient analytical method of radiocarbon in water samples, JST CREST, JPMJCR23J6. (PI: Yusuke Yokoyama @ AORI, Univ. Tokyo)

• 2022.4 - 2026.3: Unveiling the organic matter dynamics functioning in lake hypolimnion, JSPS Grant-in-Aid for Scientific Research (A), KAKENHI 22H00382. (PI: Shinichi Nakano @ CER, Kyoto Univ.)

• 2022.4 - 2026.3: High-sensitivity tracer assay for oxygen consumption rate in seawater and freshwater, JSPS Grant-in-Aid for Scientific Research (A), KAKENHI 22H00561. (PI: Urumu Tsunogai @ Nagoya Univ.)

• 2022.4 - 2025.3: Clarification of oxygen consumption systems in anaerobic water masses caused by global warming, JSPS Grant-in-Aid for Scientific Research (B), KAKENHI 22H03723, 23K24977. (PI: Yasuro Fuse @ Kyoto Inst. Tech.)

• 2022.4 - 2025.3: Elucidating the molecular heterogeneity of dissolved organic matter that governs its long-term persistence, JSPS Grant-in-Aid for Scientific Research (B), KAKENHI 22H03733, 23K24987. (PI: Morimaru Kida @ Kobe Univ.)

• 2021.7 - 2025.3: Development of a method for the detection of microbial food web in terrestrial and aquatic environments by using compound specific stable isotope analysis of multiple amino acids, JSPS Grant-in-Aid for Challenging Research (Exploratory), KAKENHI 21K19301. (PI: Ichiro Tayasu @ RHIN)

• 2021.4 - 2025.3: New development of dynamics and characterization dissolved organic nitrogen in freshwater environments by molecular weight fractionation using nanofiltration, JSPS Grant-in-Aid for Scientific Research (C), KAKENHI 21K12232. (PI: Kazuhide Hayakawa @ LBERI)

• 2019.4 - 2022.3: Microbial loop, dominant food chain in lake hypolimnion, JSPS Grant-in-Aid for Scientific Research (B), KAKENHI 19H03302. (PI: Shinichi Nakano @ CER, Kyoto Univ.)

Grants for travel or meetings

• 2011.9: Presentation at the 25th International Meeting on Organic Geochemistry (Interlaken, Switzerland), The University of Tokyo - GCOE program, International Travel Grant for Students.

• 2010.9: Organizing 2010 Youth Symposium for Japanese Geochemists, The Geochemical Society of Japan, Torii Foundation.

• Special Lecturer, Mass Extinctions and Glacial-interglacial cycles, Natural Sciences II (Earth History), Musashino Art University, Tokyo, Japan (2016.6)

• Special Lecturer, Climate changes and human activities, Workshop for science teachers in junior high schools in Fuchu City, Tokyo, Japan (2015. 3)

• Speaker, What causes Earth's environments to change?, Sanmonkai, Tokyo, Japan (2010.9)

• Outreach poster, What causes global warming?, The University of Tokyo May Festival 2009, Tokyo, Japan (2009.5)

• Teaching Assistant, Practical: Earth and Planetary Environmental Science, Department of Earth and Planetary Sciences, The University of Tokyo, Japan (2008.10-2009.3)