813 / 2024-09-19 14:11:43

Isotopic evidence for provenance and trajectory of sinking particle in the Ulleung Basin, East Sea (Japan Sea)

Sinking Particles,Neodymium Isotope,Sediment Trap,East Sea (Japan Sea),Radiocarbon Isotope,Biological Carbon Pump

Sinking particles were intercepted using sediment trap moored at depths of 300, 1000, and 2000 m at Station ES (37°63N, 131°36E; Water depth of 2370m) in the Ulleung Basin of the East Sea (Japan Sea) from March 2017 to March 2018. In this study, organic (radiocarbon isotope, Δ¹⁴C) and inorganic (neodymium isotope, εNd) tracers were analyzed to determine the provenance and trajectory of sinking particles. In order to trace the provenance of the sinking particles, the Δ¹⁴C and εNd values of surface sediments (Korean Strait, Ulleung Basin and nearby slope, Yamato Basin, Japan Basin, and Japanese continent margin) were analyzed together. The presentation will investigate the high-resolution seasonal variations of organic- and inorganic tracers throughout the year. The differences of potential provenance of sinking particles at different depths according to the oceanographic settings will also be discussed.