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地球轨道变化驱动冰期旋回的理论是气候演变研究在20世纪的最大突破。然而以65°N太阳辐射量为准的传统轨道理论,忽视了低纬区和碳循环的作用。本项目以“西太平洋暖池”为重点,通过地质资料和气候数值模拟的结合,揭示了“西太平洋暖池”和东亚季风发育的阶段性,发现了暖池海区冰消期表层水升温超前于北半球冰盖的融化。在南沙海区发现了碳同位素有40~50万年长周期,经过全球对比和对意大利上新世地层的实测与分析,证明这是世界大洋碳储库对于地球运行轨道偏心率长周期的响应,并推测是通过浮游植物群改变有机碳在海洋碳沉积中的比例所致。研究表明热带驱动和碳循环在气候演变中重要性,其正确认识是预测气候长期演变趋势的前提。是“深海973”项目总结报道之后的续篇,对上述成果作专题讨论。
The theory that the Earth’s orbital changes drive glacial cycles is the biggest breakthrough in climate change research in the 20th century. However, the traditional orbit theory based on 65 ° N solar radiation ignores the effect of low latitudes and carbon cycles. This project focuses on the “Western Pacific Warm Pool”. By combining the geological data with the climate numerical simulation, the stages of development of the “Western Pacific Warm Pool” and the East Asian Monsoon are revealed. It is found that the surface water temperature of the ice depletion period in the warm pool area is ahead of the warming Melting of the ice sheet in the northern hemisphere. In the Nansha sea area, carbon isotopes have been found in 40 to 50 million years of age. After global comparison and analysis of the Italian Pliocene stratum, it is proved that this is the response of the world’s oceanic carbon reservoirs to the long period of Earth’s orbital eccentricity. And presumably through the phytoplankton community to change the proportion of carbon in marine carbon deposition caused. Research shows the importance of tropical driving and carbon cycling in climate evolution. Correct understanding of this is a prerequisite for predicting the long-term evolution of climate. It is a sequel to the “Deep Sea 973” project summary report after the coverage of the above results.