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南海北部陆坡SZ2大型重力活塞柱状沉积物岩心提供了5万年以来的沉积记录。沉积物中陆源磷对海洋的供应量基本恒定,不同深度磷含量的变化受气候和环境变化的影响。根据沉积磷的含量随深度的变化与碳酸钙含量变化的负相关性,以及通过化学平衡计算得到的海水中P_(CO_2)与PO_4~(3-)的消长关系,表明南海北部陆坡沉积磷的积累与大气CO_2的变化相关联,为揭示导致冰期大气CO_2浓度降低的关键性因素提供了新的证据。
SZ2 large gravity piston columnar sediment cores on the northern South China Sea slope provide sedimentary records over 50,000 years. The sediment supply of terrestrial phosphorus to the ocean is basically constant. The changes of phosphorus content at different depths are affected by climate and environmental changes. According to the negative correlation between the change of sediment phosphorus content and the change of calcium carbonate content, and the relationship between P_ (CO_2) and PO_4 ~ (3-) in seawater calculated by chemical equilibrium, Accumulation is correlated with changes in atmospheric CO 2, providing new evidence for revealing the key factors contributing to the reduction of CO 2 concentrations in the glacial atmosphere.