Millennial-scale variability of Greenland dust provenance during the last glacial maximum as determined by single particle analysis
Abstract Greenland ice core records exhibited 100-fold higher dust concentrations during the Last Glacial Maximum (LGM) than during the Holocene, and dust input temporal variability corresponded to different climate states in the LGM. While East Asian deserts, the Sahara, and European loess have bee...
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ftdoajarticles:oai:doaj.org/article:bdbb553b65a24707918d29b7722d0d8f 2024-09-15T18:08:42+00:00 Millennial-scale variability of Greenland dust provenance during the last glacial maximum as determined by single particle analysis Seokhyun Ro Jonghyeon Park Hanjin Yoo Changhee Han Ahhyung Lee Yoojin Lee Minjeong Kim Yeongcheol Han Anders Svensson Jinhwa Shin Chul-Un Ro Sungmin Hong 2024-01-01T00:00:00Z https://doi.org/10.1038/s41598-024-52546-x https://doaj.org/article/bdbb553b65a24707918d29b7722d0d8f EN eng Nature Portfolio https://doi.org/10.1038/s41598-024-52546-x https://doaj.org/toc/2045-2322 doi:10.1038/s41598-024-52546-x 2045-2322 https://doaj.org/article/bdbb553b65a24707918d29b7722d0d8f Scientific Reports, Vol 14, Iss 1, Pp 1-13 (2024) Medicine R Science Q article 2024 ftdoajarticles https://doi.org/10.1038/s41598-024-52546-x 2024-08-05T17:49:53Z Abstract Greenland ice core records exhibited 100-fold higher dust concentrations during the Last Glacial Maximum (LGM) than during the Holocene, and dust input temporal variability corresponded to different climate states in the LGM. While East Asian deserts, the Sahara, and European loess have been suggested as the potential source areas (PSAs) for Greenland LGM dust, millennial-scale variability in their relative contributions within the LGM remains poorly constrained. Here, we present the morphological, mineralogical, and geochemical characteristics of insoluble microparticles to constrain the provenance of dust in Greenland NEEM ice core samples covering cold Greenland Stadials (GS)-2.1a to GS-3 (~ 14.7 to 27.1 kyr ago) in the LGM. The analysis was conducted on individual particles in microdroplet samples by scanning electron microscopy with energy dispersive X-ray spectroscopy and Raman microspectroscopy. We found that the kaolinite-to-chlorite (K/C) ratios and chemical index of alteration (CIA) values were substantially higher (K/C: 1.4 ± 0.7, CIA: 74.7 ± 2.9) during GS-2.1a to 2.1c than during GS-3 (K/C: 0.5 ± 0.1, CIA: 65.8 ± 2.8). Our records revealed a significant increase in Saharan dust contributions from GS-2.1a to GS-2.1c and that the Gobi Desert and/or European loess were potential source(s) during GS-3. This conclusion is further supported by distinctly different carbon contents in particles corresponding to GS-2.1 and GS-3. These results are consistent with previous estimates of proportional dust source contributions obtained using a mixing model based on Pb and Sr isotopic compositions in NEEM LGM ice and indicate millennial-scale changes in Greenland dust provenance that are probably linked to large-scale atmospheric circulation variabilities during the LGM. Article in Journal/Newspaper Greenland Greenland ice core ice core Directory of Open Access Journals: DOAJ Articles Scientific Reports 14 1 |
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Medicine R Science Q Seokhyun Ro Jonghyeon Park Hanjin Yoo Changhee Han Ahhyung Lee Yoojin Lee Minjeong Kim Yeongcheol Han Anders Svensson Jinhwa Shin Chul-Un Ro Sungmin Hong Millennial-scale variability of Greenland dust provenance during the last glacial maximum as determined by single particle analysis |
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Medicine R Science Q |
description |
Abstract Greenland ice core records exhibited 100-fold higher dust concentrations during the Last Glacial Maximum (LGM) than during the Holocene, and dust input temporal variability corresponded to different climate states in the LGM. While East Asian deserts, the Sahara, and European loess have been suggested as the potential source areas (PSAs) for Greenland LGM dust, millennial-scale variability in their relative contributions within the LGM remains poorly constrained. Here, we present the morphological, mineralogical, and geochemical characteristics of insoluble microparticles to constrain the provenance of dust in Greenland NEEM ice core samples covering cold Greenland Stadials (GS)-2.1a to GS-3 (~ 14.7 to 27.1 kyr ago) in the LGM. The analysis was conducted on individual particles in microdroplet samples by scanning electron microscopy with energy dispersive X-ray spectroscopy and Raman microspectroscopy. We found that the kaolinite-to-chlorite (K/C) ratios and chemical index of alteration (CIA) values were substantially higher (K/C: 1.4 ± 0.7, CIA: 74.7 ± 2.9) during GS-2.1a to 2.1c than during GS-3 (K/C: 0.5 ± 0.1, CIA: 65.8 ± 2.8). Our records revealed a significant increase in Saharan dust contributions from GS-2.1a to GS-2.1c and that the Gobi Desert and/or European loess were potential source(s) during GS-3. This conclusion is further supported by distinctly different carbon contents in particles corresponding to GS-2.1 and GS-3. These results are consistent with previous estimates of proportional dust source contributions obtained using a mixing model based on Pb and Sr isotopic compositions in NEEM LGM ice and indicate millennial-scale changes in Greenland dust provenance that are probably linked to large-scale atmospheric circulation variabilities during the LGM. |
format |
Article in Journal/Newspaper |
author |
Seokhyun Ro Jonghyeon Park Hanjin Yoo Changhee Han Ahhyung Lee Yoojin Lee Minjeong Kim Yeongcheol Han Anders Svensson Jinhwa Shin Chul-Un Ro Sungmin Hong |
author_facet |
Seokhyun Ro Jonghyeon Park Hanjin Yoo Changhee Han Ahhyung Lee Yoojin Lee Minjeong Kim Yeongcheol Han Anders Svensson Jinhwa Shin Chul-Un Ro Sungmin Hong |
author_sort |
Seokhyun Ro |
title |
Millennial-scale variability of Greenland dust provenance during the last glacial maximum as determined by single particle analysis |
title_short |
Millennial-scale variability of Greenland dust provenance during the last glacial maximum as determined by single particle analysis |
title_full |
Millennial-scale variability of Greenland dust provenance during the last glacial maximum as determined by single particle analysis |
title_fullStr |
Millennial-scale variability of Greenland dust provenance during the last glacial maximum as determined by single particle analysis |
title_full_unstemmed |
Millennial-scale variability of Greenland dust provenance during the last glacial maximum as determined by single particle analysis |
title_sort |
millennial-scale variability of greenland dust provenance during the last glacial maximum as determined by single particle analysis |
publisher |
Nature Portfolio |
publishDate |
2024 |
url |
https://doi.org/10.1038/s41598-024-52546-x https://doaj.org/article/bdbb553b65a24707918d29b7722d0d8f |
genre |
Greenland Greenland ice core ice core |
genre_facet |
Greenland Greenland ice core ice core |
op_source |
Scientific Reports, Vol 14, Iss 1, Pp 1-13 (2024) |
op_relation |
https://doi.org/10.1038/s41598-024-52546-x https://doaj.org/toc/2045-2322 doi:10.1038/s41598-024-52546-x 2045-2322 https://doaj.org/article/bdbb553b65a24707918d29b7722d0d8f |
op_doi |
https://doi.org/10.1038/s41598-024-52546-x |
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Scientific Reports |
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14 |
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1810446079875874816 |