Quantitative source-to-sink processes and carbon cycling effect of sediment on the continental slope of the western Philippine Sea since 156 ka
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摘要:
通过对西菲律宾海大陆坡上MD06-3052岩芯沉积物中有机质稳定碳同位素组成（δ13Corg）的分析，结合该孔有机碳含量、总氮含量、沉积物不同组分通量以及陆源区风化剥蚀指标等数据，探讨了156 ka以来冰期-间冰期旋回中研究区有机质的定量源-汇过程、主控因素及其碳循环效应。结果表明：δ13Corg值在−27.4‰～−18.6‰波动，平均值为−22.2‰，且呈现出冰期相对偏负而间冰期相对偏正的变化特征，有机质的具体来源包括海洋生物和陆地C3植物，在冰期和间冰期阶段分别以陆源（平均约为67%）和海源（平均约为83%）有机质的贡献为主。陆源有机碳含量和通量的变化趋势与总有机碳相应指标非常一致，均具有冰期高而间冰期低的特征，表明研究区冰期阶段有机碳通量增加的最主要原因是海平面下降所引起的大陆架出露及其上松散硅酸盐沉积物的强物理剥蚀作用。再结合热带西太平洋其他岩芯的相似记录，认为当时热带广泛出露大陆架上的强硅酸盐风化剥蚀作用及与其相伴随的高海底有机碳埋藏通量在大气CO2浓度降低和全球变冷中有着非常重要的贡献。
Abstract:We analyzed the stable carbon isotopic composition (δ13Corg) of organic matter in Core MD06-3052 retrieved from the continental slope of the western Philippine Sea. The new data, together with the published ones from the same core, including total organic carbon content, total nitrogen content, fluxes of different sediment components, and continental weathering and erosion proxies, were combined to constrain the quantitative source-to-sink processes, main controlling factors, and their carbon cycling effects of organic matter in the study area since 156 ka during glacial-interglacial cycles. Results show that the δ13Corg values fluctuate between −27.4‰ and −18.6‰ on average of −22.2‰, and are characterized by a variation characteristic of relatively negative values during the glacial periods and relatively positive values during the interglacial periods. The sources of organic matter included marine organisms and terrestrial C3 plants, dominated by terrestrial provenance (about 67% on average) and marine provenance (average 83%) during the glacial and interglacial periods, respectively. The variation trends of terrigenous organic carbon content and flux are very similar to those of the total organic carbon, and characterized by higher values during the glacial periods and lower values during the interglacial periods, indicating that the main reason for the increased organic carbon fluxes is continental shelf exposure during the glacial periods at sea level drop, and thus the strong weathering and erosion of loose silicate sediments. Combined with similar records of other cores in the tropical Western Pacific, we conclude that strong weathering and erosion of silicates on the widely exposed continental shelves and the associated high organic carbon burial flux in the sea during three stages could contribute greatly to the reduction of atmospheric carbon dioxide concentration, and consequent global cooling.
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Key words:
- western Philippine Sea /
- organic matter source /
- sea level change /
- glacial-interglacial /
- carbon cycle
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