海洋科学2025，Vol.49Issue(10)：26-38,13.DOI:10.11759/hykx20240422002
40ka以来苏拉威西海沉积粒度记录
Record of the grain size of Sulawesi Sea sedimentation since 40 ka
摘要
Abstract
The Indo-Pacific Warm Pool is among the most active regions for ocean-atmosphere and ocean-land interactions globally,serving as a crucial site for global material and energy exchange.The Indonesian throughflow(ITF)serves as the primary low-altitude pathway connecting the Pacific and Indian Oceans,playing a significant role in regulating global climate change.Previous studies have used various proxies,including stable oxygen and carbon isotope ratios(δ18O and δ13C)of marine authigenic carbonates and elemental ratios of terrigenous compo-nents,to reconstruct ITF strength and water-mass properties,yielding substantial results.However,the current un-derstanding of the ITF remains largely confined to the upper ocean layer,with limited knowledge of intermediate-and deep-ocean currents.To bridge this gap,this study analyzed the grain size compositions of 446 sediment sam-ples from core MD98-2178,located off the northeastern coast of Borneo,spanning the last 40 ka.End-member(EM)modeling algorithms were applied to the grain size data to decompose the sedimentary components.The results show that a two-EM model accounts for 90%of grain size variability.Over the past 40 ka,the fine EM(EM1)to coarse EM(EM2)ratio(EM1/EM2)has exhibited consistent variation with the sortable silt(SS)record,reflecting fluctuations in deep bottom current velocity.Further comparison of the EM2 and SS grain size records with δ18O data from the Greenland and Antarctic(Maud)ice cores,alongside local precipitation and sea-level changes,sug-gests that the grain size EM variations in the study area are mainly driven by changes in the local current intensity and not by precipitation-driven weathering and denudation in the source region.关键词
粒度/苏拉威西海/端元模拟/印度尼西亚贯穿流Key words
grain size/Sulawesi Sea/end-member modeling/Indonesian throughflow分类
海洋科学引用本文复制引用
李小然,于兆杰,李鑫雨,唐小洁,宋泽华,康晓莹,COLIN Christophe,万世明..40ka以来苏拉威西海沉积粒度记录[J].海洋科学,2025,49(10):26-38,13.基金项目
国家自然科学基金项目(42376055,W2421051) （42376055,W2421051）
中国科学院(B类)战略性先导科技专项项目(XDB42000000) （B类）
山东省优秀青年基金项目(ZR2022YQ33) National Natural Science Foundation of China,Nos.42376055,W2421051 （ZR2022YQ33）
Strategic Priority Research Program of Chinese Academy of Sciences No.XDB42000000 （）
Natural Science Foundation of Shandong No.ZR2022YQ33 （）
