2026-10-06T17:02:53Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34029612 2026-09-30T04:43:50Z category_62 portal_316 item_type_3 month_year_09_2026

Table 1_Planktic–benthic foraminiferal isotope differentiation and sedimentary carbon variability on the Hupo Basin Slope, Southwestern East Sea.xlsx Hyun Ju Ha (25141413) Sangmin Hyun (8000753) Kyeong Yoon Kwak (25141416) Jeongwon Kang (23626795) Yunji Kim (21172083) Byung-Cheol Kum (25141419) Seok Jang (25141422) Marine Biology East Sea foraminiferal stable isotopes Hupo Basin marine organic matter sedimentary carbon composition water column decoupling <p>Marine sediments preserve interactions among biological carbon production, water column structure, and sedimentary carbon composition, yet the relationship between vertical water-column differentiation and sedimentary carbon variability remains poorly constrained in the southwestern East Sea. This study integrates sedimentary facies, bulk geochemical proxies, including total organic carbon (TOC), CaCO₃, C/N ratios, δ¹³Corg, and TOC/TIC ratios, and planktic and benthic foraminiferal stable isotopes from core E09–05 recovered from the Hupo Basin slope to evaluate the relationship between sedimentary carbon variability and vertical water column structure. The analyzed interval was divided into five geochemical–lithological units (GLUs). GLU III is characterized by high CaCO₃ contents and low TOC/TIC ratios, representing a carbonate-rich interval, whereas GLU IV marks a transition toward increasing organic carbon contents. GLU V is characterized by high TOC and TOC/TIC ratios, low C/N ratios, and higher δ¹³Corg values, indicating organic carbon enrichment and a greater relative contribution of marine-derived organic matter. Planktic δ¹⁸O generally decreases and δ¹³C increases toward the upper part of the core, whereas benthic isotope records show no comparable directional changes. Consequently, planktic–benthic δ¹⁸O and δ¹³C offsets increase markedly in GLU V, indicating greater surface–bottom isotopic differentiation, consistent with stronger vertical hydrographic and biogeochemical differentiation. The enriched planktic δ¹³C values, together with the organic geochemical characteristics of GLU V, further suggest enhanced biological carbon utilization and potentially enhanced surface-water productivity. The co-occurrence of greater surface–bottom isotopic differentiation and organic carbon enrichment reveals a close stratigraphic association between vertical water-column differentiation and sedimentary carbon variability. This association provides a framework for interpreting the potential roles of marine organic matter supply and preservation in shaping sedimentary carbon composition on the Hupo Basin slope.</p> 2026-09-30T04:43:50Z Dataset Dataset 10.3389/fmars.2026.1977666.s001 https://figshare.com/articles/dataset/Table_1_Planktic_benthic_foraminiferal_isotope_differentiation_and_sedimentary_carbon_variability_on_the_Hupo_Basin_Slope_Southwestern_East_Sea_xlsx/34029612 CC BY 4.0