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- W2003202911 abstract "The early Eocene was marked by a series of abrupt warming events. Numerical modelling suggests that the events were the result of nonlinear interactions between orbital forcing, ocean circulation and the carbon cycle. A series of transient global warming events1,2 occurred during the late Palaeocene and early Eocene, about 59 to 50 million years ago. The events, although variable in magnitude, were apparently paced by orbital cycles2,3,4 and linked to massive perturbations of the global carbon cycle5,6. However, a causal link between orbital changes in insolation and the carbon cycle has yet to be established for this time period. Here we present a series of coupled climate model simulations that demonstrate that orbitally induced changes in ocean circulation and intermediate water temperature can trigger the destabilization of methane hydrates. We then use a simple threshold model to show that progressive global warming over millions of years, in combination with the increasing tendency of the ocean to remain in a more stagnant state, can explain the decreasing magnitude and increasing frequency of hyperthermal events throughout the early Eocene. Our work shows that nonlinear interactions between climate and the carbon cycle can modulate the effect of orbital variations, in this case producing transient global warming events with varying timing and magnitude." @default.
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- W2003202911 date "2011-10-02" @default.
- W2003202911 modified "2023-10-01" @default.
- W2003202911 title "A model for orbital pacing of methane hydrate destabilization during the Palaeogene" @default.
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- W2003202911 doi "https://doi.org/10.1038/ngeo1266" @default.
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