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Deep Equatorial Pacific Ocean Oxygenation and Atmospheric CO2 Over The Last Ice Age.
- Source :
- Scientific Reports; 4/20/2020, Vol. 10 Issue 1, p1-10, 10p
- Publication Year :
- 2020
-
Abstract
- Ventilation of carbon stored in the deep ocean is thought to play an important role in atmospheric CO<subscript>2</subscript> increases associated with Pleistocene deglaciations. The presence of this respired carbon has been recorded by an array of paleoceanographic proxies from various locations across the global ocean. Here we present a new sediment core from the Eastern Equatorial Pacific (EEP) Ocean spanning the last 180,000 years and reconstruct high-resolution <superscript>230</superscript>Th-derived fluxes of <superscript>232</superscript>Th and excess barium, along with redox-sensitive uranium concentrations to examine past variations in dust delivery, export productivity, and bottom-water oxygenation, respectively. Our bottom-water oxygenation record is compared to other similar high-resolution records from across the Pacific and in the Southern Ocean. We suggest that the deep Pacific is a site of respired carbon storage associated with periods of decreased global atmospheric CO<subscript>2</subscript> concentration during the LGM, confirming the conclusions from a wealth of previous studies. However, our study is the first to show a similar relationship beyond the last glacial, extending to at least 70,000 years. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20452322
- Volume :
- 10
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Scientific Reports
- Publication Type :
- Academic Journal
- Accession number :
- 142815606
- Full Text :
- https://doi.org/10.1038/s41598-020-63628-x