中新社成都8月7日电（记者 贺劭清）中外科研团队最新研究发现，地球自转速度在过去的7亿年中呈现阶梯式减速。这一研究揭示了地球自转减速的阶段性变化，对于理解地球与月球之间的引力作用以及地史时期气候变化有着重要意义。
研究指出，在7亿年至2亿年前，地球与月球的距离增加了约20000公里，日长也相应增加了约2.2小时。这一发现表明，地月之间的引力作用一直在影响着地球的自转速度。
研究团队通过天文理论计算，获得了过去7亿年至2亿年的地球自转参数，并通过地质记录的对比，验证了潮汐模型的可靠性。研究还表明，超大陆聚合和冰川发育也对地球自转速率产生了影响。
此外，研究还发现，地球自转的两个主要减速期可能为早期海洋生态系统的演化提供了必要的条件。这一研究对于重建地月系统的演化历史，探究地球自转减速的气候、环境、生物演化等方面具有重要的理论意义。
这项研究成果已于8月7日发表在国际学术期刊《美国科学院院刊》上，论文的第一作者和通讯作者分别为成都理工大学沉积地质研究院的黄何研究员和马超教授。这一发现不仅加深了人类对地球自转历史的理解，也为未来的科学研究提供了新的视角。
英语如下：
Title: “Earth’s Rotation Slowed in Staircase Pattern Over 700 Million Years, New Study Reveals”
Keywords: Slowdown, Staircase, Geological
Content:
CGTN CHENGDU, Aug. 7 (Xinhua) — A joint research team from China and abroad has discovered that the Earth’s rotation has been slowing down in a staircase pattern over the past 700 million years. The study reveals the phases of change in the Earth’s rotation slowdown, which is of great significance for understanding the gravitational interaction between the Earth and the moon as well as climate changes during the geological history.
The research indicates that from 700 million to 200 million years ago, the distance between the Earth and the moon increased by about 20,000 kilometers, resulting in an increase in the length of the day by about 2.2 hours. This finding suggests that the gravitational interaction between the Earth and the moon has been affecting the Earth’s rotation speed throughout this period.
The research team obtained the Earth’s rotation parameters for the past 700 million to 200 million years through astronomical theoretical calculations and verified the reliability of the tidal model by comparing it with geological records. The study also showed that the aggregation of supercontinents and the development of glaciers have influenced the Earth’s rotation rate.
Additionally, the study found that the two major periods of slowdown in the Earth’s rotation may have provided necessary conditions for the evolution of early marine ecosystems. This research is of great theoretical significance for reconstructing the evolution history of the Earth-moon system and exploring the climate, environmental, and biological evolution aspects of Earth’s rotation slowdown.
The research findings were published in the journal “Proceedings of the National Academy of Sciences” on August 7. The first and corresponding authors of the paper are Huang He, a researcher at the Institute of Sedimentary Geology at Chengdu University of Technology, and Professor Ma Chao. This discovery not only deepens human understanding of Earth’s rotational history but also offers a new perspective for future scientific research.
【来源】http://www.chinanews.com/gn/2024/08-07/10265182.shtml
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