地质学
强迫(数学)
斯佩莱奥瑟姆
日晒
纬度
南半球
气候变化
气候学
洞穴
低纬度
优势(遗传学)
海洋学
古生物学
冰期
末次冰期最大值
自然地理学
北半球
地理
考古
大地测量学
化学
基因
生物化学
作者
Brian Chase,Chris Harris,Maarten J. de Wit,J. H. Kramers,Sean Doel,Jacek Stankiewicz
出处
期刊:Geology
[Geological Society of America]
日期:2021-07-23
卷期号:49 (11): 1353-1357
被引量:17
摘要
Abstract Variation in δ18O and δ13C values in a speleothem from the Cango Caves in southernmost South Africa enable the construction of coherent regional composite records spanning the past 113,500 yr. Novel for the region in terms of both their length and detail, these records indicate environmental and climatic changes that both are consistent with records from the wider region and show a clear evolution from low- to high-latitude forcing dominance across the last glacial period. Prior to ca. 70 ka, the influence of direct low-latitude insolation forcing is expressed through increases in summer rainfall during austral summer insolation maxima. With the onset of Marine Isotope Stage 4, cooler global conditions and the development of high-latitude ice sheets appear to have supplanted direct insolation forcing as the dominant driver pacing patterns of environmental change, with records from the Southern and Northern Hemisphere tropics exhibiting a positive relationship until after the Last Glacial Maximum. These results highlight the complexity of South African climate change dynamics as a response to changing global boundary conditions and provide a critical reference for regional and global comparisons.
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