[U-03] Advanced understanding of Quaternary and Anthropocene hydroclimate changes in East Asia

[U03-P04] Salinity, oxygen isotope, hydrogen isotope, and radiocarbon of coastal seawater of North Japan

*Kaoru Kubota¹, Keisuke Sakai², Ken'ichi Ohkushi², Tomihiko Higuchi³, Kotaro Shirai³, Masayo Minami⁴ (1.Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 2.Kobe University, 3.AORI, The University of Tokyo, 4.Nagoya University)

Keywords:Radiocarbon, oxygen isotope, hydrogen isotope

To understand seawater properties, such as water mass structure and mixing, geochemical analyses are useful. However, geochemical datasets for seawater that fully cover coastal areas of Hokkaido, North Japan are lacking. Here we report comprehensive geochemical analyses of seawater (salinity, δ¹⁸O, δD, and Δ¹⁴C) collected in August–September 2021 from coastal areas of Hokkaido as well as the west coast of Tohoku (Northeast Japan). These datasets are expected to improve our understanding of seawater properties around Hokkaido, thereby contributing to oceanography, climatology, biogeochemical cycles, and fishery science.