Orbital Controls on North Pacific Dust Flux During the Late Quaternary
(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.
(Less)
- author
- organization
- publishing date
- 2024-02
- 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}}, }