末次冰盛期全球海洋有机碳埋藏通量相比晚全新世增加了约47±18%，解析该有机碳来源和年龄组成，有助于认知其对大气CO2浓度变化的调控作用。然而，有关末次冰盛期有机质14C组成的资料匮乏，对该时期有机质埋藏碳汇效应及其调控机制的认识尚不清楚。针对这一问题，本项目聚焦末次冰盛期与晚全新世典型背景下，拟对冲绳海槽沉积岩芯开展有机质14C年龄组成的研究。利用总有机质升温热裂解-14C技术量化评估有机质的来源、通量和年龄特征；结合长链正构脂肪酸、直链烯酮的14C年龄及其在敏感粒级矿物单位比表面的载荷量，探讨陆架水动力搬运过程对陆源有机质埋藏效率及14C年龄的影响。通过末次冰盛期与晚全新世的资料对比，尝试梳理海平面变化对西太平洋边缘陆坡沉积有机质的源—汇过程及其碳汇效应的影响。

Sediment organic carbon burial removes CO2 from the ocean–atmosphere pool, playing an important role in regulating climate changes. It has been reported that the accumulation rate of marine sediment organic carbon was 47±18% higher during the last glacial maximum than during the Holocene. However, sources and 14C age compositions of the glacial buried organic carbon remains ambiguous, hindering our understanding on marine carbon cycle. By carrying out RPO-14C analysis on total organic carbon from sediment cores derived from the Okinawa Trough, this study aims to estimate the contributions from contemporary, pre-aged and petrogenic organic carbon during the last glacial maximum. Combined with 14C ages of long-chain fatty acids and alkenones, as well as biomarker loadings on hydrodynamic-sensitive mineral surface, from the same core, effort will be focused on the mechanisms controlling organic carbon burial efficiency and variation of 14C ages. Results from this study are expected to improve our understanding about the effect of sea level change on the source-sink process of sedimentary organic carbon in the western Pacific margin.