Orbital Controls on North Pacific Dust Flux During the Late Quaternary

Autor: Yi Zhong, Yanguang Liu, Hu Yang, Qiuzhen Yin, David J. Wilson, Zhengyao Lu, Samuel L. Jaccard, Torben Struve, Peter D. Clift, Stefanie Kaboth‐Bahr, Juan C. Larrasoaña, André Bahr, Xun Gong, Debo Zhao, Yanan Zhang, Wenyue Xia, Qingsong Liu
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Geophysical Research Letters, Vol 51, Iss 4, Pp n/a-n/a (2024)
Druh dokumentu: article
ISSN: 1944-8007
0094-8276
DOI: 10.1029/2023GL106631
Popis: Abstract Airborne mineral dust is sensitive to climatic changes, but its response to orbital forcing is still not fully understood. Here, we present a reconstruction of dust input to the Subarctic Pacific Ocean covering the past 190 kyr. The dust composition record is indicative of source moisture conditions, which were dominated by precessional variations. In contrast, the dust flux record is dominated by obliquity variations and displays an out‐of‐phase relationship with a dust record from the mid‐latitude North Pacific Ocean. Climate model simulations suggest precession likely drove changes in the aridity and extent of dust source regions. Additionally, the obliquity variations in dust flux can be explained by meridional shifts in the North Pacific westerly jet, driven by changes in the meridional atmospheric temperature gradient. Overall, our findings suggest that North Pacific dust input was primarily modulated by orbital‐controlled source aridity and the strength and position of the westerly winds.
Databáze: Directory of Open Access Journals
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