冰期天文理论的创立与演变

发布时间：2018-05-29 01:08

本文选题：轨道参数变化发现 + 深海氧同位素记录　；参考：《华南师范大学学报(自然科学版)》2014年02期

【摘要】：冰期天文理论是运用地球轨道偏心率、地轴倾角和地转轴进动的3种参数的变化幅度与周期来解释上新世—第四纪期间冰期—间冰期交替变化的一种理论.该理论1842年由Adhemar提出,经过Croll发展到Milankovitch最终完成,经历了整100年的时间.上世纪60年代开始,深海、黄土、冰芯等大量的地质记录都揭示出3种周期变化,证实冰期天文理论的正确性,同时也对冰期天文理论带来了一些概念上的修正.但是,Berger计算的天文曲线至少从6 Ma以来展示同一规律的变化,然而地质记录却显示清晰的分段响应模式:41 kyr的地轴倾角周期在5.3~1.4 Ma期间一直是记录曲线的主要特征;北半球冰川作用只是在2.7 Ma BP才开始大规模出现;0.8 Ma开始100 ka周期转变为主要周期,称之为中更新世转型(MPT).还有:11阶段和全新世是2个偏心率很低的时期,但记录中却是冰期—间冰期振幅最大的时期,即大的间冰期为何出现于低偏心时期;由间冰期进入冰期比由冰期进入间冰期时来得迅速,意味大冰盖建造需要很长的时间,而消融则比较迅速.这些都是冰期天文理论本身不能解释的问题,正在由地球响应系统的研究来探索答案.
[Abstract]:The theory of glacial astronomy is a theory of explaining the alternating change of glacial and interglacial epoch during Pliocene and Quaternary using the variation range and period of three parameters of Earth orbit eccentricity, earth axis inclination angle and earth rotation axis precession. The theory was put forward by Adhemar in 1842 and developed from Croll to Milankovitch. Since the 1960s, a large number of geological records such as deep-sea, loess and ice cores have revealed three periodic changes, which confirm the correctness of the astronomical theory of the glacial age, and have also brought some conceptual amendments to the astronomical theory of the glacial age. However, the astronomical curve calculated by Berger shows the same regularity since at least 6 Ma. However, the geological records show that the clear piecewise response model: 41 kyr is the main feature of the recorded curve during the period of 5.31.4Ma. It was only at 2.7 Ma BP that the glaciation in the Northern Hemisphere began to occur on a large scale at 0.8 Ma and began to transform from 100 ka cycle to the main cycle, which is called the Middle Pleistocene transition (MPT). There are also two periods of low eccentricity in the stages of: 11 and Holocene, but the largest amplitude of glacial to interglacial period is recorded, that is, why the large interglacial period occurs in the low eccentricity period; The transition from interglacial to interglacial is faster than that from interglacial to interglacial, which means that it takes a long time to construct the large ice sheet, and the ablation is more rapid. These are questions that the glacial astronomical theory itself cannot explain, and are being explored by the Earth's response system.
【作者单位】：华南师范大学地理科学学院;
【基金】：国家自然科学基金项目(41171014)
【分类号】：P1-0

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