Latest Neogene Paleoclimate Variation in Yunnan, Southwest China, Revealed by Fossil Leaf Physiognomy
Latest Neogene Paleoclimate Variation in Yunnan, Southwest China, Revealed by Fossil Leaf Physiognomy
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DOI：
10.1111/1755-6724.15054
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
Jing Dai;Weizhao Chen;Liang Huang;Yi'nan Zhang
中科院分区：
文献类型：
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作者：
Jing Dai;Weizhao Chen;Liang Huang;Yi'nan Zhang
位于青藏高原东南缘的云南省可以提供全球变冷如何影响气候变化的重要信息。然而，它在最近第三纪的温度和降水的变化模式还没有很好的理解。根据云南省宜良县上新统茨营组31个形态类型的357个植物化石标本，应用叶缘分析和气候叶分析多变量程序对古气候进行了研究。与现今气候相比，上新世晚期以来的年平均气温和最冷月气温变化不大，而最暖月气温则显著下降。所有与降水相关的参数都有所下降，尤其是冬季降水。结合云南其他地区同期气候资料，发现滇西、滇东地区晚上新世以来气温变化除滇中地区外，基本上呈现相似的变化规律;而降水变化除冬季降水量持续减少外，并不遵循共同的规律。研究结果进一步证实了在全球变冷和季风系统增强的背景下，云南不同地区由于地形的不均匀性，对这些变化表现出不同的气候响应。
Yunnan Province, located in the southeastern margin of the Tibetan Plateau, can provide important information on how climate change was influenced by global cooling. However, its variation patterns in temperature and precipitation during the latest Neogene are not well‐understood. Based on the 357 specimens assigned to 31 morphotypes of plant fossils from the upper Pliocene Ciying Formation in Yiliang County, Yunnan Province, Southwest China, paleoclimate was estimated by Leaf Margin Analysis and Climate Leaf Analysis Multivariate Program. Compared to the present climate, the mean annual temperature and coldest month temperature have not changed significantly since the late Pliocene, whereas the warmest month temperature has decreased significantly. All precipitation‐related parameters have decreased, particularly winter precipitation. Combined with the climatic data of the same period in other areas of Yunnan, the western and eastern Yunnan has shown a similar pattern in temperature variation since the late Pliocene except for central Yunnan; whereas the variation in precipitation does not follow a common law except for a consistent decrease in winter precipitation. Our study reinforced the fact that under the background of global cooling and intensified monsoon systems, different areas of Yunnan exhibit different climatic responses to these changes because of their topographic heterogeneities.