论文部分内容阅读
首先综述了现代热带海洋生产力的分类与影响因素,然后讨论了古生产力替代性指标的分类与各类方法的优点与局限性。在此基础上,通过收集整理前人使用不同替代性指标对热带海洋古生产力重建的结果,讨论了热带海洋古生产力记录的特征、周期性与驱动机制。发现从末次冰期到全新世热带海洋古生产力在冰期时明显偏高,但冰期生产力高间冰期生产力低的规律并不一直适用,MIS 22前后西太平洋初级生产力在冰期—间冰期的变化发生反转。热带海洋古生产力的周期性也与高纬海区显著不同,岁差和斜率的信号更为显著。还存在约30 ka等不同轨道周期叠加之后形成的周期。颗石藻计算的海洋生产力可能存在约400 ka周期,这对全球碳同位素的影响有待深入研究。
Firstly, the classification and influencing factors of modern tropical marine productivity are reviewed. Then, the classification of alternative indices of paleocroproductivity and the advantages and limitations of various methods are discussed. On this basis, by collecting and sorting out the results of the reconstructions of paleocroproductivity of tropical oceans using different alternative indicators, the characteristics, periodicity and driving mechanism of paleocapacite productivity in tropical oceans are discussed. It is found that the paleo-productivity of the tropical sea from the last glacial to the Holocene was obviously higher during the glacial period, but the law of low glacial productivity during the glacial period was not always applicable. The changes of the primary productivity of the western Pacific during the glacial-interglacial phases reversed . The periodicity of paleocapacity in tropical oceans is also significantly different from that in high latitudes, and the signals of precession and slope are more pronounced. There is also a period of about 30 ka after the formation of different orbital periods. The marine productivity calculated by coccolith may have a period of about 400 ka, which needs further study on the impact of global carbon isotope.