中更新世气候转型:特征、机制和展望

发布时间：2018-06-26 18:46

本文选题：中更新世转型(MPT) + 冰期-间冰期旋回　；参考：《科学通报》2017年33期

【摘要】：中更新世转型(mid-Pleistocene transition,MPT)的特征、机理及其影响一直是古气候研究的热点问题之一.通过综合分析全球代表性的地质记录,揭示出海洋和陆地气候变化在中更新世(距今~1.2至~0.7 Ma)多表现为从准4万年到准10万年的主导周期转型,但低纬地区水文气候的周期变化不显著.数值模拟研究表明,地球轨道参数变动引起的太阳辐射变化可能是冰期-间冰期气候旋回的根本驱动,而下垫面和大气CO2浓度变化的反馈机制则触发了中更新世气候周期转型并放大冰期-间冰期的波动.因此,MPT是地球气候系统内外部多个因素共同作用的结果.未来研究一方面应加强中低纬地区水文循环变化研究,关注中更新世气候转型影响的区域差异;另一方面通过整合气候重建和模拟结果,辨析区域气候变化响应差异的主要诱因.
[Abstract]:The characteristics, mechanism and influence of mid-Pleistocene transition (MPT) have always been one of the hot issues in paleoclimate research. Through a comprehensive analysis of the global representative geological records, it is revealed that the climate change of the oceans and continents in the Middle Pleistocene (1.2 to 0.7 Ma) showed a dominant cycle transition from quasi-40,000 years to quasi-100000 years. But the periodic variation of hydroclimate in low latitude area is not significant. Numerical simulation shows that the solar radiation caused by the variation of the Earth's orbit parameters may be the fundamental driving force of the glacial to interglacial climatic cycles. The feedback mechanism of the change of CO _ 2 concentration in the underlying surface and atmosphere triggers the transition of the climate cycle in the Middle Pleistocene and amplifies the fluctuation between the glacial and interglacial ages. Therefore, MPT is the result of many factors acting together inside and outside the earth's climate system. Future studies should, on the one hand, strengthen the study of hydrological cycle changes in middle and low latitudes and pay attention to regional differences in the impacts of climate transition in the Middle Pleistocene; on the other hand, by integrating the results of climate reconstruction and simulation, The main inducement of the difference of regional climate change response is analyzed.
【作者单位】：中国科学院地球环境研究所黄土与第四纪地质国家重点实验室;中国科学院大学;西安交通大学全球变化研究院;
【分类号】：P532

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