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Orbital Controls on North Pacific Dust Flux During the Late Quaternary

Zhong, Yi ; Liu, Yanguang ; Yang, Hu ; Yin, Qiuzhen ; Wilson, David J. ; Lu, Zhengyao LU ; Jaccard, Samuel L. ; Struve, Torben ; Clift, Peter D. and Kaboth-Bahr, Stefanie , et al. (2024) In Geophysical Research Letters 51(4).
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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Geophysical Research Letters
volume
51
issue
4
article number
e2023GL106631
publisher
American Geophysical Union (AGU)
external identifiers
  • scopus:85185269172
ISSN
0094-8276
DOI
10.1029/2023GL106631
language
English
LU publication?
yes
id
fb18c31c-953d-4c86-9109-7ad3a77245bb
date added to LUP
2024-03-26 14:08:05
date last changed
2024-03-26 14:08:18
@article{fb18c31c-953d-4c86-9109-7ad3a77245bb,
  abstract     = {{<p>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.</p>}},
  author       = {{Zhong, Yi and Liu, Yanguang and Yang, Hu and Yin, Qiuzhen and Wilson, David J. and Lu, Zhengyao and Jaccard, Samuel L. and Struve, Torben and Clift, Peter D. and Kaboth-Bahr, Stefanie and Larrasoaña, Juan C. and Bahr, André and Gong, Xun and Zhao, Debo and Zhang, Yanan and Xia, Wenyue and Liu, Qingsong}},
  issn         = {{0094-8276}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{American Geophysical Union (AGU)}},
  series       = {{Geophysical Research Letters}},
  title        = {{Orbital Controls on North Pacific Dust Flux During the Late Quaternary}},
  url          = {{http://dx.doi.org/10.1029/2023GL106631}},
  doi          = {{10.1029/2023GL106631}},
  volume       = {{51}},
  year         = {{2024}},
}