Modern‐Type Eolian Regime and Global Cooling‐Modulated Dust Provenance in the Late Paleogene of Central‐East Asia
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Le résumé fourni par la source
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.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Modern‐Type Eolian Regime and Global Cooling‐Modulated Dust Provenance in the Late Paleogene of Central‐East Asia
- Date Crossref
- 01/02/2024
- Éditeur
- American Geophysical Union (AGU)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Uppsala University Department of Earth Sciences pays non établi dans la noticeUniversité ou école supérieure
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University of Helsinki Department of Geosciences and Geography pays non établi dans la noticeUniversité ou école supérieure
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Geological Survey of Finland pays non établi dans la noticeOrganisme public
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Finnish Meteorological Institute pays non établi dans la noticeOrganisme public
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University of Oslo Department of Geosciences pays non établi dans la noticeUniversité ou école supérieure
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Chinese Academy of Sciences pays non établi dans la noticeOrganisme public
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Institute of Vertebrate Paleontology and Paleoanthropology pays non établi dans la noticeStructure de recherche
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University of Chinese Academy of Sciences pays non établi dans la noticeUniversité ou école supérieure
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Norwegian Meteorological Institute pays non établi dans la noticeOrganisme public
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CAS Center for Excellence in Life and Paleoenvironment Beijing China pays non établi dans la noticeInstitution
Department of Earth Sciences — Uppsala University, Department of Geosciences and Geography — University of Helsinki et Geological Survey of Finland, avec 7 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.