Impact of oceanic reorganizations on the ocean carbon cycle and atmospheric carbon diocide content ...
A zonally averaged, circulation-biogeochemical ocean model is used to explore how the distribution of PO4 and δ13C in the major basins and the atmospheric pCO2 respond to rapid changes in the thermohaline circulation (THC). Different evolutions of the Atlantic THC are simulated by applying surface f...
| Main Authors: | , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
University of Bern
1998
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.48350/158215 https://boris-portal.unibe.ch/handle/20.500.12422/42976 |
| Summary: | A zonally averaged, circulation-biogeochemical ocean model is used to explore how the distribution of PO4 and δ13C in the major basins and the atmospheric pCO2 respond to rapid changes in the thermohaline circulation (THC). Different evolutions of the Atlantic THC are simulated by applying surface freshwater pulses typical, for example, of Heinrich events and the last deglaciation. In the model, when the THC completely collapses, PO4 increases (>0.5 mmol m−3) and δ13C decreases (<0.5‰) in Atlantic bottom waters because of a drop in ventilation by North Atlantic Deep Water (NADW). Although consistent with the traditional interpretation of sedimentary records of benthic foraminiferal Cd/Ca and δ13C, the relationship between the degree of PO4 enrichment and δ13C depletion and the degree of THC reduction is not linear. In the NADW formation area the preformed PO4 declines (<0.5 mmol m−3) because of an imbalance between biological uptake and PO4 supply from the deep, and the preformed δ13C rises (>1‰) ... |
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