Abstract
Possible sources of carbon that may have caused global warming at the Paleocene-Eocene boundary are constrained using an intermediate complexity Earth-system model confi gured with early Eocene paleogeography. We fi that 6800 Pg C (δ 13 C of -22‰) is the smallest pulse modeled here to reasonably reproduce observations of the extent of seafl oor CaCO 3 dis- solution. This pulse could not have been solely the result of methane hydrate destabilization, suggesting that additional sources of CO 2 such as volcanic CO 2 , the oxidation of sedimentary organic carbon, or thermogenic methane must also have contributed. Observed contrasts in dissolution intensity between Atlantic and Pacifi c sites are reproduced in the model by reduc- ing bioturbation in the Atlantic during the event, simulating a potential consequence of the spread of low-oxygen bottom waters.
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