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大河中的沉积有机碳的热稳定性主导了边缘海洋

Siyu Chen¹, Peng Yao², Zheng Wang¹

¹Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China.

The Science of the total environment

|September 29, 2024

概括

海洋沉积物中的有机碳 (OC) 的热稳定性受沉积物类型和位置的影响. 长江河口和东中国海架上较高的OC含量和较细的沉积物表明,OC的热稳定性更高,影响埋葬效率.

科学领域:

海洋地质海洋地质学
地质化学地质化学
有机地化学有机地化学

背景情况:

在海洋环境中,有机碳 (OC) 埋葬效率受到其热稳定性的显著影响.
了解OC在边缘海洋的热稳定性的分布和控制因素至关重要,但仍然有限.

研究的目的:

调查江河口 (CE) 和东中国海 (ECS) 架的表面沉积物中OC的热稳定性.
确定控制这些边缘海洋环境中OC热稳定性和反应性的因素.

主要方法:

热重力测量分析 (TGA) 用于确定可变和耐火有机物质 (OM_L和OM_R) 的含量.
碳反应率指数 (CRI) 的计算用于评估OC的热稳定性.
分析了OC含量,中位粒大小和稳定的碳同位素比率 (δ¹³C).

主要成果:

与沙地区相比,CE和民海岸 (ZMC) 的移动泥土中观察到更高的可变和耐火有机物质含量.
平均CRI为69.3±4.2%,较低的值通常在CE和ZMC移动泥中发现,较高的值在一些内部河口和外部架站中发现.
CRI显示了与OC含量的反相关性,与沙沉积物的中位粒大小的正相关性. 在沙沉积物中,CRI也与13C负相关,这表明源相关的差异.

结论:

与欧洲一些边缘海相比,CE和ECS架上的沉积式有机碳具有更高的热稳定性,这可能是由于广泛的沉积物动态影响了保存效率.
有机矿物相互作用和有机物来源是控制OC在这些边缘海洋中的反应性和热稳定的关键因素.

关键词:

碳反应性指数是指碳的反应性指数.大河流主导的边缘海洋主要是大河流.沉积式有机碳沉积式有机碳热重力测量分析热重力测量分析热稳定性热稳定性

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