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· Re: THE CHANGING CARBON CYCLE
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 AN ABERRATION IN THE GLOBAL CARBON CYCLE 55 MILLION YEARS AGO

by James C. Zachos

Approximately 55 million years ago (Mya) at the boundary between the Paleocene and Eocene epochs (P-E boundary), the Earth experienced an extreme global warming event that persisted for several tens of thousands of years, and which triggered short- and long-term changes in marine and terrestrial ecosystems. Several lines of evidence suggest that the warming was caused by the sudden decomposition of marine methane hydrates which ultimately released >2000 gigatons of carbon (GtC) to the atmosphere. In theory, a large portion of this carbon would have been absorbed by the ocean, thereby lowering the ocean pH, and initiating a neutralization process involving the massive dissolution of seafloor carbonate. This process would enable the ocean to absorb and temporarily store additional carbon. Permanent sequestration of this excess carbon, however, would occur gradually through a number of negative feedback processes such as the burial of organic carbon. Quantitatively, the most important feedback should be the chemical weathering of silicate rocks, and eventual redeposition of carbonate on the seafloor. Here, I discuss the evidence used to constrain the magnitude of changes in ocean carbon chemistry 55 Mya, and implications for future carbon cycle feedbacks.

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The 7th International CO2 Conference

The Omni Interlocken Resort
September 25th - 30th
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