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.

中文翻译：

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南非洞穴揭示高纬度和低纬度强迫对过去 113.5 ky 的影响

来自南非最南端 Cango Caves 的洞穴中 δ18O 和 δ13C 值的变化能够构建跨越过去 113,500 年的连贯区域复合记录。这些记录在长度和细节方面都很新颖，这些记录表明环境和气候变化与更广泛地区的记录一致，并显示了上次冰期从低纬度到高纬度的强迫主导地位的明显演变。在大约之前。70 ka，直接低纬度日照强迫的影响通过在南方夏季日照最大值期间夏季降雨量的增加来表达。随着海洋同位素第 4 阶段的开始，较冷的全球条件和高纬度冰盖的发展似乎已经取代直接日照强迫成为环境变化的主要驱动因素，南半球和北半球热带地区的记录显示出正相关关系，直到末次冰期最大值之后。这些结果突出了南非气候变化动态作为对不断变化的全球边界条件的响应的复杂性，并为区域和全球比较提供了重要参考。