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• W2098017050 abstract "One of the largest and most abrupt climatic warming events documented in the geologic record occurred at the end of the Paleocene epoch. Oceanic deep waters warmed to 10°C, and high‐latitude surface waters warmed from ∼10°C to ∼20°C within several thousand years. This coincided with weakened atmospheric circulation and the extinction of ∼50% of deep‐sea benthic foraminiferal species. It has been suggested that this warm excursion was forced by higher atmospheric pCO 2 and greenhouse effects caused by a pulse of hydrothermal activity and/or volcanism. Stable isotopic evidence is presented from two widely separated locations that suggest this warming was associated with a drop in oceanic pCO 2 rather than an increase. Oceanic pCO 2 change across this event was estimated using a model of 13 C fractionation in photosynthate organic carbon versus [CO 2aq ], with solubility constants for CO 2 and stable isotopic paleotemperature estimates. To derive a well‐preserved record for surface ocean δ 13 C change the organic carbon bound within the calcite lattice of well‐preserved planktonic foraminifera was extracted for isotopic analysis. With allowance for uncertainty in the isotopic differences between phytoplankton and foraminiferal organic matter, the initial results indicate a drop in surface ocean pCO 2 at high and low latitudes from 600–700 parts per million (ppm) to ∼200 ppm. Lower pCO 2 persisted for at least 10,000 years. The duration of the pCO 2 excursion was long enough for the ocean and atmosphere to have reached a new steady state condition. There is no evidence of increased organic carbon burial in the deep sea during this period. Two alternative explanations are presented to account for such a rapid drop in oceanic pCO 2 . One involves reduced upwelling induced by diminished wind stress as atmospheric circulation weakened in response to climate warming. This would have reduced the rate of metabolic CO 2 recycling into the surface ocean. It will be necessary to obtain data from regions outside potential upwelling zones in order to evaluate this. The second involves a readjustment of carbonate equilibria in the ocean to higher [CO 3 = ] in the surface ocean, particularly at high latitudes where surface waters warmed to approximately 20°C. Such a shift in carbonate equilibria would have lowered the ocean's capacity to take in CO 2 . If the initial results presented here do accurately reflect a change in the global ocean [CO 2aq ], the Paleocene/Eocene boundary event may provide clues about the ocean's physical and biological response to rapid, large‐scale perturbations in atmospheric pCO 2 and to global warming." @default.
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• W2098017050 date "1992-08-01" @default.
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• W2098017050 title "Higher temperatures and lower oceanic pCO₂: A climate enigma at the end of the Paleocene Epoch" @default.
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• W2098017050 doi "https://doi.org/10.1029/92pa01183" @default.
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