Authors
Seokhyun Ro, Changhee Han, Yeongcheol Han, Soon Do Hur, Chul-Un Ro, Jørgen Peder Steffensen, Anders Svensson, Hubertus Fischer, Andrea Burke, Khanghyun Lee, Ahhyung Lee, Sungmin Hong
Published in
Proceedings of the National Academy of Sciences of the United States of America. Volume 123. Issue 46. Pages e2618898123. Nov 17, 2026. Epub Nov 09, 2026.
Abstract
Greenland ice-core records show an approximately 15-fold increase in dust concentration during cold stadial periods compared to warmer interstadial periods in the last glacial period (LGP). While multiple regions including East Asian deserts and the Sahara have been suggested as potential source areas (PSAs) for Greenland dust, millennial-scale variability of their relative contributions associated with Dansgaard-Oeschger climatic fluctuations during the LGP remains poorly constrained. To address this, we investigate high-resolution (~800 y) Pb and Sr isotopic, mineralogical, and geochemical records from the North Greenland Eemian Ice Drilling ice-core samples covering the entire LGP. We found that the Pb and Sr isotopic compositions, kaolinite-to-chlorite ratios, and chemical index of alteration values were higher during stadials than during interstadials. Comparison with PSAs suggests that East Asian deserts remained the dominant contributors to Greenland dust throughout the LGP, but contributions from the Sahara increased during stadial intervals. This shift likely reflects climate-driven changes in atmospheric circulation patterns responsible for transporting dust to Greenland. Our findings provide insights into the relationship between dust cycle dynamics and abrupt climate changes on millennial timescales during the LGP.
PMID:
43002677
Bibliographic data and abstract were imported from PubMed on 10 Nov 2026.
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