Projects per year
Abstract
The Southern Ocean plays a crucial role in regulating atmospheric CO2
on centennial to millennial time scales. However, observations of
sufficient resolution to explore this have been lacking. Here, we report
high-resolution, multiproxy records based on precisely dated deep-sea
corals from the Southern Ocean. Paired deep (∆14C and δ11B) and surface (δ15N)
proxy data point to enhanced upwelling coupled with reduced efficiency
of the biological pump at 14.6 and 11.7 thousand years (ka) ago, which
would have facilitated rapid carbon release to the atmosphere. Transient
periods of unusually well-ventilated waters in the deep Southern Ocean
occurred at 16.3 and 12.8 ka ago. Contemporaneous atmospheric carbon
records indicate that these Southern Ocean ventilation events are also
important in releasing respired carbon from the deep ocean to the
atmosphere. Our results thus highlight two distinct modes of Southern
Ocean circulation and biogeochemistry associated with centennial-scale
atmospheric CO2 jumps during the last deglaciation.
Original language | English |
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Article number | eabb3807 |
Number of pages | 10 |
Journal | Science Advances |
Volume | 6 |
Issue number | 42 |
DOIs | |
Publication status | Published - 16 Oct 2020 |
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Dive into the research topics of 'Rapid shifts in circulation and biogeochemistry of the Southern Ocean during deglacial carbon cycle events'. Together they form a unique fingerprint.Projects
- 1 Finished
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Bridging the timing gap: connecting: Bridging the timing gap: connecting Southern Ocean and Antarctic climate records
Rae, J. W. B. (PI)
1/10/15 → 11/06/19
Project: Standard