黄淮平原区晚新生代气候变迁

Late Cenozoic climate changes in the Huanghuai Plain

  • 摘要: 通过梳理黄淮平原内的黄土、湖沼和石笋等剖面及钻孔沉积记录,探讨了该区晚新生代以来的气候变化特征,并对比分析了该区气候变化的时空差异。结果表明,新近纪期间东亚季风系统开始逐渐建立,研究区气候带由干旱区转为湿润区。晚新生代以来,黄淮平原区构造尺度气候变化符合东亚气候变化的一般趋势,即经历了较显著的阶段性冷干化演变。第四纪期间,黄淮平原区气候表现出典型的轨道尺度冷暖波动(冰期-间冰期旋回),可能是在全球宏观气候背景下对东亚季风强弱变化的响应。然而在千年尺度,受区域地形等局地因素的影响,黄淮平原区全新世气候变化在空间上表现出一定的差异性和穿时性。

     

    Abstract: Based on the published records of loess, lacustrine-marsh deposits, stalagmite and other archives, this paper attempts to explore the characteristics of Late Cenozoic climate changes and to make comparative analyzes of the similarities and differences of climate changes on different spatiotemporal scales in the Huanghuai Plain. The results show that the East Asian monsoon system began to establish in Neogene, and as the result this area changed its climate zone from a previous arid area to a humid area. Since late Cenozoic, the pattern of climate change in the Huanghuai Plain has been consistent with the general trend of East Asian region in the tectonic timescale, which has experienced a drastic change from warm and humid to cold and dry. During the Quaternary period, the climate changes showed typical orbit-scale cold and warm fluctuations or glacial-interglacial cycles in the study area, possibly as a response to the changes of the intensity of the East Asian monsoon under the global climate background. However, due to the influence of local factors such as regional topography, the Holocene climate change shows a certain degree of spatial differentiation and diachroneity in the Huanghuai Plain on a millennium scale.

     

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