[A-OS26] Coastal Ecosystems: Land-to-Ocean Biogeochemical Cycles and their Ecosystem Functions

[AOS26-P13] Environmental drivers of temporal variations in groundwater discharge to the coastal region off the Tone River estuary: Insight from radium isotopes

*Toshimi Nakajima¹, Eiji Masunaga², Anne Takahashi¹, Takashi Murakami¹, Shigeyoshi Otosaka¹, Naoki Furuichi³, Ryo Sugimoto⁴, Yu Umezawa⁵, Sachihiko Itoh¹ (1. Atmosphere and Ocean Research Institute, The University of Tokyo, 2. Ibaraki University, 3. Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 4. Fukui Prefectural University, 5. Tokyo University of Agriculture and Technology)

Keywords:Groundwater, Pore water, Radioisotopes, Open coast