A dataset of particulate carbon, 234Th, and related parameters in the Northwest Pacific Ocean

The dataset provides station information, hydrographic parameters, 234Th activity data, particulate 234Th and particulate carbon measurements, PC/234Th ratios, and 234Th-derived particle export fluxes across the upper Northwest Pacific Ocean.Table S1 includes station metadata and water-column measurements, including station name, longitude, latitude, temperature, total 234Th activity (TTh), bottle-collected particulate 234Th activity (PTh_B), pump-collected particulate 234Th fractions (>51 μm, PTh_51; 1–51 μm, PTh_1), and corresponding particulate carbon concentrations, including bottle-collected particulate carbon (PC_B), pump-collected large-size particulate carbon (PC_51), and small-size particulate carbon (PC_1).Table S2 provides 234Th fluxes at multiple export horizons, including 60, 80, 100, 160, and 200 m, together with particulate carbon to 234Th activity ratios used for carbon flux conversion, including bottle-collected PC/234Th_B and pump-collected PC/234Th ratios for the >51 μm and 1–51 μm size fractions.

These data support the estimation of particle export fluxes, particulate carbon export fluxes, export efficiency, and flux attenuation in the upper Northwest Pacific Ocean.