- 2022 - 2025 海洋における窒素循環速度の定量
- 2020 - 2023 Transdiscipline research on climate change adaptation in Papua New Guinea.
- 2016 - 2018 Public Anthropology of Traditional Marine Resorces Management around the Bismark Sea.
- 2014 - 2017 The oxygen isotope anomaly of nitrate as tracer of atmospheric nitrate in marine nitrogen cycling
- 2013 - 2015 triple oxygen isotope
- 2011 - 2013 Remote temperature sensing on the fumarolic area using hydrogen isotopic compositions of molecular hydrogen in volcanic plume
- 2008 - 2010 Tracing the fate of atmospheric nitrate deposited onto the ecosystem using the triple oxygen isotopes as tracers
- 2008 - 2009 Tracing nitrous oxide using the triple oxygen isotopic compositions as tracers
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