Rapid shifts in circulation and biogeochemistry of the Southern Ocean during deglacial carbon cycle events
| Autor: | George H. Rowland, Laura F. Robinson, Timothy D J Knowles, Peter T. Spooner, Ana Samperiz, John Southon, Xingchen T. Wang, Andrea Burke, Gaojun Li, Joseph A. Stewart, James W. B. Rae, Albertine Pegrum-Haram, Jun Chen, Tao Li, Hong Chin Ng, Maria G. Prokopenko, Tianyu Chen |
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| Přispěvatelé: | NERC, University of St Andrews. School of Earth & Environmental Sciences, University of St Andrews. St Andrews Isotope Geochemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
GC
Multidisciplinary 010504 meteorology & atmospheric sciences Ocean current fungi NDAS Atmospheric carbon cycle SciAdv r-articles Biogeochemistry Biological pump Geology Oceanography 010502 geochemistry & geophysics 01 natural sciences Deep sea Carbon cycle Deglaciation Upwelling GC Oceanography Research Articles Research Article 0105 earth and related environmental sciences |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| Popis: | Absolutely dated deep-sea coral ∆14C, δ11B, and δ15N records reveal Southern Ocean’s role in rapid deglacial carbon cycle events. 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. |
| Databáze: | OpenAIRE |
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