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.

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