Change in dust seasonality as the primary driver for orbital scale dust storm variability in East Asia

Serno, Sascha; Winckler, Gisela; Anderson, Robert F.; Jaccard, Samuel; Kienast, Stephanie S.; Haug, Gerald H. (2017). Change in dust seasonality as the primary driver for orbital scale dust storm variability in East Asia. Geophysical Research Letters, 44(8), pp. 3796-3805. American Geophysical Union 10.1002/2016GL072345

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Glacial periods are recognized to be dustier than interglacials, but the conditions leading to greater dust mobilization are poorly defined. Here we present a new high-resolution dust record based on 230Th-normalized 4He flux from Ocean Drilling Program site 882 in the Subarctic North Pacific covering the last 170,000 years. By analogy with modern relationships, we infer the mechanisms controlling orbital-scale dust storm variability in East Asia. We propose that orbital-scale dust flux variability is the result of an expansion of the dust season into summer, in addition to more intense dust storms during spring and fall. The primary drivers influencing dust flux include summer insolation at subarctic latitudes and variable Siberian alpine glaciation, which together control the cold air reservoir in Siberia. Changes in the extent of the Northern Hemisphere ice sheets may be a secondary control.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Jaccard, Samuel

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0094-8276

Publisher:

American Geophysical Union

Funders:

[4] Swiss National Science Foundation

Language:

English

Submitter:

Samuel Jaccard

Date Deposited:

30 May 2017 14:25

Last Modified:

23 Oct 2017 02:30

Publisher DOI:

10.1002/2016GL072345

BORIS DOI:

10.7892/boris.99479

URI:

https://boris.unibe.ch/id/eprint/99479

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