Log-ratio of silica to aluminium counts (ln(Si/Al)) from ODP site 108-658 ...
Growing evidence suggests that the low atmospheric CO2 concentration of the ice ages resulted from enhanced storage of CO2 in the ocean interior, largely as a result of changes in the Southern Ocean1. Early in the most recent deglaciation, a reduction in North Atlantic overturning circulation seems...
| Main Authors: | , , , , , , , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
2013
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.810016 https://doi.pangaea.de/10.1594/PANGAEA.810016 |
| Summary: | Growing evidence suggests that the low atmospheric CO2 concentration of the ice ages resulted from enhanced storage of CO2 in the ocean interior, largely as a result of changes in the Southern Ocean1. Early in the most recent deglaciation, a reduction in North Atlantic overturning circulation seems to have driven CO2 release from the Southern Ocean**2, 3, 4, 5, but the mechanism connecting the North Atlantic and the Southern Ocean remains unclear. Biogenic opal export in the low-latitude ocean relies on silicate from the underlying thermocline, the concentration of which is affected by the circulation of the ocean interior. Here we report a record of biogenic opal export from a coastal upwelling system off the coast of northwest Africa that shows pronounced opal maxima during each glacial termination over the past 550,000 years. These opal peaks are consistent with a strong deglacial reduction in the formation of silicate-poor glacial North Atlantic intermediate water**2 (GNAIW). The loss of GNAIW allowed ... : Supplement to: Meckler, Anna Nele; Sigman, Daniel M; Gibson, Kelly A; Francois, Roger; Martínez‐García, Alfredo; Jaccard, Samuel L; Röhl, Ursula; Peterson, Larry C; Tiedemann, Ralf; Haug, Gerald H (2013): Deglacial pulses of deep-ocean silicate into the subtropical North Atlantic Ocean. Nature, 495(7442), 495-498 ... |
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