Latest Neogene Paleoclimate Variation in Yunnan,Southwest China,Revealed by Fossil Leaf Physiognomy  

作　　者：DAI Jing CHEN Weizhao HUANG Liang ZHANG Yi’nan 

机构地区：[1]School of Earth Science,Yunnan University,Kunming 650500,China [2]Ministry of Natural Resources Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization,Kunming 650051,China [3]Yunnan Institute of Geological Survey,Kunming 650216,China [4]Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China

出　　处：《Acta Geologica Sinica(English Edition)》2023年第4期1268-1281,共14页地质学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41962001,41302013);Fundamental Research Foundation of Yunnan Science and Technology Department(Grant No.202101AT070198);Special Fund for Talent Cultivation of Yunnan University(Grant No.2018YDJQ023);Plateau Mountain Ecology and Earth's Environment Discipline Construction Project(Grant No.C1762101030017);Joint Foundation Project between Yunnan Science and Technology Department and Yunnan University(Grant No.C176240210019)。

摘　　要：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.

关 键 词：plant fossil paleoclimate reconstruction MONSOON PLIOCENE YUNNAN 

分 类 号：Q914.2[天文地球—古生物学与地层学] P532[生物学—古生物学]