South African speleothems reveal influence of high and lowlatitude forcing over the past 113.5 k.y.

Brian Chase, Chris Harris, Maarten J. deWit, Jan Kramers, Sean Doel, Jacek Stankiewicz

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1353-1357
Number of pages5
JournalGeology
Volume49
Issue number11
DOIs
Publication statusPublished - Nov 2021

ASJC Scopus subject areas

  • Geology

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