Modern‐Type Eolian Regime and Global Cooling‐Modulated Dust Provenance in the Late Paleogene of Central‐East Asia
Abstract Atmospheric mineral dust is a poorly constrained yet extremely important component of the climate system. Provenance studies from geologic dust archives are crucial to understand the drivers of the dust cycle over long time scales. Our multi‐technique provenance analysis of a rare Paleogene...
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ftdoajarticles:oai:doaj.org/article:d75b661b12e74969a0757780ff911d41 2024-09-15T18:18:17+00:00 Modern‐Type Eolian Regime and Global Cooling‐Modulated Dust Provenance in the Late Paleogene of Central‐East Asia K. Bohm J. Wasiljeff T. Stevens J. Salminen H. Tang Y. Lahaye M. Kurhila Z. Zhang O. Haugvaldstad A. Kaakinen 2024-02-01T00:00:00Z https://doi.org/10.1029/2023GC011167 https://doaj.org/article/d75b661b12e74969a0757780ff911d41 EN eng Wiley https://doi.org/10.1029/2023GC011167 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2023GC011167 https://doaj.org/article/d75b661b12e74969a0757780ff911d41 Geochemistry, Geophysics, Geosystems, Vol 25, Iss 2, Pp n/a-n/a (2024) detrital zircon detrital rutile anisotropy of magnetic susceptibility Chinese Loess Plateau Siberian High Eocene‐Oligocene transition Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2024 ftdoajarticles https://doi.org/10.1029/2023GC011167 2024-08-05T17:49:49Z Abstract Atmospheric mineral dust is a poorly constrained yet extremely important component of the climate system. Provenance studies from geologic dust archives are crucial to understand the drivers of the dust cycle over long time scales. Our multi‐technique provenance analysis of a rare Paleogene (35–27 Ma) eolian dust sequence from Ulantatal, ∼400 km northwest of the Chinese Loess Plateau (CLP), shows that Paleogene dust transporting winds generally varied between northwesterly and westerly, the same as those in the late Neogene‐Quaternary bipolar icehouse. We propose that, as today, westerly wind circulation patterns would have been modulated by an Arctic Oscillation (AO)‐like situation, and that the warm Eocene favored a long‐term negative phase of AO, leading to meridional westerly circulation and the dominance of a northwesterly dust transport pathway. After the Eocene‐Oligocene transition (EOT), long‐term positive phase of AO‐like conditions initiated, leading to stronger and more zonal westerlies. The Siberian High (SH) also formed or strengthened at the EOT and started to control dust storm activity along the northwesterly transport pathway. We argue that increased Paleogene Northern Hemisphere (NH) ice volume was the ultimate driver of this modern‐type dust transport regime in the Ulantatal region, possibly also controlling initial Ulantatal dust sequence formation via the development of the SH and modern‐type eolian regime. The similarity between the Ulantatal and late Neogene northern CLP dust provenance signals suggests that the increased NH ice volume, via its control on the northwesterly dust transport, could have promoted increased loess formation also in the late Miocene. Article in Journal/Newspaper Magnetic susceptibility Directory of Open Access Journals: DOAJ Articles Geochemistry, Geophysics, Geosystems 25 2 |
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language |
English |
topic |
detrital zircon detrital rutile anisotropy of magnetic susceptibility Chinese Loess Plateau Siberian High Eocene‐Oligocene transition Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
spellingShingle |
detrital zircon detrital rutile anisotropy of magnetic susceptibility Chinese Loess Plateau Siberian High Eocene‐Oligocene transition Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 K. Bohm J. Wasiljeff T. Stevens J. Salminen H. Tang Y. Lahaye M. Kurhila Z. Zhang O. Haugvaldstad A. Kaakinen Modern‐Type Eolian Regime and Global Cooling‐Modulated Dust Provenance in the Late Paleogene of Central‐East Asia |
topic_facet |
detrital zircon detrital rutile anisotropy of magnetic susceptibility Chinese Loess Plateau Siberian High Eocene‐Oligocene transition Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract Atmospheric mineral dust is a poorly constrained yet extremely important component of the climate system. Provenance studies from geologic dust archives are crucial to understand the drivers of the dust cycle over long time scales. Our multi‐technique provenance analysis of a rare Paleogene (35–27 Ma) eolian dust sequence from Ulantatal, ∼400 km northwest of the Chinese Loess Plateau (CLP), shows that Paleogene dust transporting winds generally varied between northwesterly and westerly, the same as those in the late Neogene‐Quaternary bipolar icehouse. We propose that, as today, westerly wind circulation patterns would have been modulated by an Arctic Oscillation (AO)‐like situation, and that the warm Eocene favored a long‐term negative phase of AO, leading to meridional westerly circulation and the dominance of a northwesterly dust transport pathway. After the Eocene‐Oligocene transition (EOT), long‐term positive phase of AO‐like conditions initiated, leading to stronger and more zonal westerlies. The Siberian High (SH) also formed or strengthened at the EOT and started to control dust storm activity along the northwesterly transport pathway. We argue that increased Paleogene Northern Hemisphere (NH) ice volume was the ultimate driver of this modern‐type dust transport regime in the Ulantatal region, possibly also controlling initial Ulantatal dust sequence formation via the development of the SH and modern‐type eolian regime. The similarity between the Ulantatal and late Neogene northern CLP dust provenance signals suggests that the increased NH ice volume, via its control on the northwesterly dust transport, could have promoted increased loess formation also in the late Miocene. |
format |
Article in Journal/Newspaper |
author |
K. Bohm J. Wasiljeff T. Stevens J. Salminen H. Tang Y. Lahaye M. Kurhila Z. Zhang O. Haugvaldstad A. Kaakinen |
author_facet |
K. Bohm J. Wasiljeff T. Stevens J. Salminen H. Tang Y. Lahaye M. Kurhila Z. Zhang O. Haugvaldstad A. Kaakinen |
author_sort |
K. Bohm |
title |
Modern‐Type Eolian Regime and Global Cooling‐Modulated Dust Provenance in the Late Paleogene of Central‐East Asia |
title_short |
Modern‐Type Eolian Regime and Global Cooling‐Modulated Dust Provenance in the Late Paleogene of Central‐East Asia |
title_full |
Modern‐Type Eolian Regime and Global Cooling‐Modulated Dust Provenance in the Late Paleogene of Central‐East Asia |
title_fullStr |
Modern‐Type Eolian Regime and Global Cooling‐Modulated Dust Provenance in the Late Paleogene of Central‐East Asia |
title_full_unstemmed |
Modern‐Type Eolian Regime and Global Cooling‐Modulated Dust Provenance in the Late Paleogene of Central‐East Asia |
title_sort |
modern‐type eolian regime and global cooling‐modulated dust provenance in the late paleogene of central‐east asia |
publisher |
Wiley |
publishDate |
2024 |
url |
https://doi.org/10.1029/2023GC011167 https://doaj.org/article/d75b661b12e74969a0757780ff911d41 |
genre |
Magnetic susceptibility |
genre_facet |
Magnetic susceptibility |
op_source |
Geochemistry, Geophysics, Geosystems, Vol 25, Iss 2, Pp n/a-n/a (2024) |
op_relation |
https://doi.org/10.1029/2023GC011167 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2023GC011167 https://doaj.org/article/d75b661b12e74969a0757780ff911d41 |
op_doi |
https://doi.org/10.1029/2023GC011167 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
25 |
container_issue |
2 |
_version_ |
1810456410421460992 |