Evaluating the Drivers of Quaternary Dust Fluxes to the Western North Pacific: East Asian Dustiness and Northern Hemisphere Gustiness

Author:

Abell Jordan T.123ORCID,Winckler Gisela12ORCID,Pullen Alex4ORCID,Kinsley Christopher W.56ORCID,Kapp Paul A.3ORCID,Middleton Jennifer L.1ORCID,Pavia Frank J.7ORCID,McGee David5ORCID,Ford Heather L.8ORCID,Raymo Maureen E.12ORCID

Affiliation:

1. Lamont‐Doherty Earth Observatory Columbia University Palisades NY USA

2. Department of Earth and Environmental Sciences Columbia University New York NY USA

3. Department of Geosciences University of Arizona Tucson AZ USA

4. Department of Environment Engineering and Earth Sciences Clemson University Clemson SC USA

5. Department of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of Technology Cambridge MA USA

6. Berkeley Geochronology Center Berkeley CA USA

7. Division of Geological and Planetary Sciences California Institute of Technology Pasadena CA USA

8. School of Geography Queen Mary University of London London UK

Abstract

AbstractQuantifying variability in, and identifying the mechanisms behind, East Asian dust production and transport across the last several million years is essential for constraining future dust emissions and deposition. Our current understanding of East Asian dust dynamics through the Quaternary is primarily limited to low‐resolution records from the North Pacific Ocean, those from the Chinese Loess Plateau (CLP), and paleoenvironmental reconstructions from arid basins. All are susceptible to sediment winnowing and focusing as well as input of poorly constrained or unidentified non‐dust detrital material. To avoid these limitations, we examine high‐resolution, constant flux proxy‐derived dust fluxes from the North Pacific and find evidence for higher glacial dust fluxes in the late Pliocene‐early Pleistocene compared to the late Pleistocene‐Holocene. Our results suggest decreasing dust transported to the mid‐latitude North Pacific Ocean from eastern Asia across the Quaternary. This observation is ostensibly at odds with previous dust records from marine sediments and the CLP, and with the perception of higher East Asian dust production and transport during the late Pleistocene associated with the amplification of glaciations. We provide three possible scenarios to describe the ∼2,700‐ky evolution of eastern Asia glacial dust dynamics, and discuss them in the context of sediment production, availability, and atmospheric circulation. Our data and proposed driving mechanisms not only raise questions about the framework typically used to interpret dust archives from East Asia and the North Pacific Ocean, but also provide a roadmap for hypothesis testing and future work necessary to produce better‐constrained records of paleo‐dust fluxes.

Funder

National Science Foundation

Publisher

American Geophysical Union (AGU)

Subject

Paleontology,Atmospheric Science,Oceanography

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