Millennial-scale ocean dynamics controlled export productivity in the subtropical North Pacific

Li, Dawei; Zheng, Li-Wei; Jaccard, Samuel; Fang, Tien-Hsi; Paytan, Adina; Zheng, Xufeng; Chang, Yuan-Pin; Kao, Shuh-Ji (2017). Millennial-scale ocean dynamics controlled export productivity in the subtropical North Pacific. Geology, 45(7), pp. 651-654. Geological Society of America 10.1130/G38981.1

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The integrated effects of ocean-climate dynamics on export production in the North Pacific have remained elusive. We present a 91 k.y. export productivity (EP) record based on sedimentary reactive phosphorus from the western subtropical North Pacific. On a millennial time scale, EP decreased during Northern Hemisphere cold events when atmospheric dust loading was high, and increased during warm episodes. The inferred antiphase relation between dust and EP suggests that the supply of macronutrients to the sunlit surface ocean, modulated by the penetration depth of North Pacific Intermediate Water and not eolian Fe, exerted a major control on EP in the subtropical North Pacific. A compilation of global EP records suggests that eolian Fe most likely played a role in stimulating EP regionally only in the Subantarctic zone of the Southern Ocean. Over the past 91 k.y., during the cold-south–warm-north phase of the bipolar seesaw, the biological pump in both hemispheres was enhanced synchronously, yet by different drivers; atmospheric Fe input for the Subantarctic and subsurface macronutrient supply for the North Pacific, including the tropical and/ or subtropical Pacific, and the Antarctic zone of the Southern Ocean.

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:

0091-7613

Publisher:

Geological Society of America

Language:

English

Submitter:

Samuel Jaccard

Date Deposited:

03 Aug 2017 11:35

Last Modified:

03 Aug 2017 11:35

Publisher DOI:

10.1130/G38981.1

BORIS DOI:

10.7892/boris.101266

URI:

https://boris.unibe.ch/id/eprint/101266

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