Evolution of Ocean Productivity in the Sub‐Tropical West Pacific Ocean Across the Last Deglaciation

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Serval ID
serval:BIB_360B0631A48B
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Evolution of Ocean Productivity in the Sub‐Tropical West Pacific Ocean Across the Last Deglaciation
Journal
Paleoceanography and Paleoclimatology
Author(s)
Hu Bangqi, Zhang Handan, Ouyang Siqi, Zhao Jingtao, Wang Feifei, Li Qing, Jaccard Samuel L., Luo Yiming
ISSN
2572-4517
2572-4525
Publication state
Published
Issued date
08/2021
Peer-reviewed
Oui
Volume
36
Number
8
Language
english
Abstract
Changes in marine export productivity may have played a prominent role in the atmospheric CO2 rise and associated warming of the last deglaciation, via their impact on the air-sea partitioning of CO2. To study the evolution of marine export production in the western subtropical Pacific Ocean during the last deglaciation and the mechanisms governing these changes, 230Th-normalization has been applied on a sediment core retrieved from the Okinawa Trough. The reconstructed export productivity record shows two prominent peaks, centered around 14 and 17 ka. Given that phytoplankton growth at our study site is limited by the availability of nutrients today, elevated macro-nutrient supply must have been responsible for sustaining the two deglacial productivity peaks. Specifically, higher nutrient supply originating from the subpolar gyre via subsurface water advection, with enhanced vertical mixing in the subpolar gyre during early HS1 and enhanced wind-driven upwelling during the B/A, would have fueled phytoplankton productivity and export. In contrast, reduced nutrient supply to the euphotic zone caused by gyre circulation changes would have lead to decreased export production during the Holocene. These observations lend support to a predominant control of nutrient availability on the evolution of the marine carbon cycle in the subtropical west Pacific Ocean across the last deglaciation.
Funding(s)
Swiss National Science Foundation / PP00P2_172915
Swiss National Science Foundation / PP00P2_144811
Create date
31/07/2021 13:02
Last modification date
01/08/2021 5:37
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