Estimating the potential for methane clathrate instability in the 1%-CO2 IPCC AR-4 simulations

Details Estimating the potential for methane clathrate instability in the 1%-CO2 IPCC AR-4 simulations Estimating the potential for methane clathrate instability in the 1%-CO2 IPCC AR-4 simulations

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3519806l&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 19, CiteID L19806

Physics

5

Atmospheric Composition And Structure: Constituent Sources And Sinks, Global Change: Abrupt/Rapid Climate Change (4901, 8408), Cryosphere: Clathrate

Scientific paper

The recent work of Reagan and Moridis (2007) has shown that even a limited warming of 1 K over 100 years can lead to clathrate destabilization, leading to a significant flux of methane into the ocean water, at least for shallow deposits. Here we study the potential for methane clathrate destabilization by identifying the 100-year temperature increase in the available IPCC (Intergovernmental Panel on Climate Change) AR-4 1%-CO2 increase per year (up to doubling over pre-industrial conditions, which occurs after 70 years) simulations. Depending on assumptions made on the possible locations (in this case, only depth) of methane clathrates and on temperature dependence, our calculation leads to an estimated model-mean release of methane at the bottom of the ocean of approximately 560-2140 Tg(CH4)/year; as no actual geographical distribution of methane clathrates is considered here, these flux estimates must be viewed as upper bound estimates. Using an observed 1% ratio to estimate the amount of methane reaching the atmosphere, our analysis leads to a relatively small methane flux of approximately 5-21 Tg(CH4)/year, with an estimated inter-model standard deviation of approximately 30%. The role of sea-level rise by 2100 will be to further stabilize methane clathrates, albeit to a small amount as the sea-level rise is expected to be less than a few meters.

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