A movable trigger: Fossil fuel CO2 and the onset of the next glaciation

doi:doi:10.1029/2004GC000891

Abstract

Cited By

Abstract

A movable trigger: Fossil fuel CO₂ and the onset of the next glaciation

David Archer

Department of Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, Illinois, 60637, USA

Andrey Ganopolski

Potsdam Institute for Climate Impact Research, Potsdam, P.O. Box 601203, 14773, Germany

The initiation of northern hemisphere ice sheets in the last 800 kyr appears to be closely controlled by minima in summer insolation forcing at 65°N. Beginning from an initial typical interglacial pCO₂ of 280 ppm, the CLIMBER-2 model initiates an ice sheet in the Northern Hemisphere when insolation drops 0.7 σ (standard deviation) or 15 W/m² below the mean. This same value is required to explain the history of climate using an orbitally driven conceptual model based on insolation and ice volume thresholds (Paillard, 1998). When the initial baseline pCO₂ is raised in CLIMBER-2, a deeper minimum in summertime insolation is required to nucleate an ice sheet. Carbon cycle models indicate that ∼25% of CO₂ from fossil fuel combustion will remain in the atmosphere for thousands of years, and ∼7% will remain beyond one hundred thousand years (Archer, 2005). We predict that a carbon release from fossil fuels or methane hydrate deposits of 5000 Gton C could prevent glaciation for the next 500,000 years, until after not one but two 400 kyr cycle eccentricity minima. The duration and intensity of the projected interglacial period are longer than have been seen in the last 2.6 million years.

Received 1 December 2004; accepted 15 March 2005; published 5 May 2005.

Citation: Archer, D., and A. Ganopolski (2005), A movable trigger: Fossil fuel CO₂ and the onset of the next glaciation, Geochem. Geophys. Geosyst., 6, Q05003, doi:10.1029/2004GC000891.

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Doney, Scott C., and David S. Schimel (2007), Carbon and Climate System Coupling on Timescales from the Precambrian to the Anthropocene^*, Annu Rev Environ Resourc, 32(1), 31, doi:10.1146/annurev.energy.32.041706.124700.

Lenton, Timothy M., and Clare Britton (2006), Enhanced carbonate and silicate weathering accelerates recovery from fossil fuel CO₂ perturbations, Global Biogeochem Cycles, 20, GB3009, doi:10.1029/2005GB002678.

Montenegro, Alvaro, Victor Brovkin, Michael Eby, David Archer, and Andrew J. Weaver (2007), Long term fate of anthropogenic carbon, Geophys Res Lett, 34, L19707, doi:10.1029/2007GL030905.

Schmittner, Andreas, Andreas Oschlies, H. Damon Matthews, and Eric D. Galbraith (2008), Future changes in climate, ocean circulation, ecosystems, and biogeochemical cycling simulated for a business-as-usual CO₂ emission scenario until year 4000 AD, Global Biogeochem Cycles, 22, GB1013, doi:10.1029/2007GB002953.

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