Middle Holocene Organic Carbon and Biomarker Records from the South Yellow Sea: Relationship to the East Asian Monsoon
Middle Holocene Organic Carbon and Biomarker Records from the South Yellow Sea: Relationship to the East Asian Monsoon
复制标题
南黄海中全新世有机碳和生物标志物记录：与东亚季风的关系
DOI：
10.1007/s11802-018-3521-y
复制
发表时间：
2018
影响因子：
1.6
通讯作者：
Liang Dong
中科院分区：
文献类型：
--
作者：
Liang Zou;Bangqi Hu;Jun Li;Yanguang Dou;Luhua Xie;Liang Dong
东亚季风系统影响着东亚边缘海陆源和陆源有机质的沉积和输运。本研究测定了南黄海中部YSC-1柱状样的有机碳（OC）同位素值、海洋生物标志物浓度、OC和总氮（TN）水平。我们的目标是追踪中全新世以来有机碳的来源和古生产力的变化，以及它们与东亚季风系统的关系。陆源与海洋有机质在核心沉积物中的相对贡献估计使用的OC同位素的两端元混合模型。结果表明，中全新世以来，沉积物主要成分为海相有机质。陆地有机碳浓度（OCter）的变化与东亚夏季风的历史相似。海洋有机碳浓度（OCmar）的变化与东亚夏季风曲线的变化相反，表明海洋有机碳浓度明显受陆源物质输入的影响。陆地营养盐的输入发生在河流和风尘的形式，而营养盐的浓度在地表水主要来自底层水通过黄海环流系统，这是由东亚冬季风（EAWM）控制。海洋有机质和生物标志物记录所代表的古生产力变化与近年来的EAWM强度研究基本一致，因此，与EASM相比，EAWM可能是控制南海海洋生产力变化的主要因素。
The East Asian monsoon system influences the sedimentation and transport of organic matter in East Asian marginal seas that is derived from both terrestrial and marine sources. In this study, we determined organic carbon (OC) isotope values, concentrations of marine biomarkers, and levels of OC and total nitrogen (TN) in core YSC-1 from the central South Yellow Sea (SYS). Our objectives were to trace the sources of OC and variations in palaeoproductivity since the middle Holocene, and their relationships with the East Asian monsoon system. The relative contributions of terrestrial versus marine organic matter in core sediments were estimated using a two-end-member mixing model of OC isotopes. Results show that marine organic matter has been the main sediment constituent since the middle Holocene. The variation of terrestrial organic carbon concentration (OCter) is similar to the EASM history. However, the variation of marine organic carbon concentration (OCmar) is opposite to that of the EASM curve, suggesting OCmar is distinctly influenced by terrestrial material input. Inputs of terrestrial nutrients into the SYS occur in the form of fluvial and aeolian dust, while concentrations of nutrients in surface water are derived mainly from bottom water via the Yellow Sea circulation system, which is controlled by the East Asian winter monsoon (EAWM). Variations in palaeoproductivity represented by marine organic matter and biomarker records are, in general, consistent with the recent EAWM intensity studies, thus, compared with EASM, EAWM may play the main role to control the marine productivity variations in the SYS.