Methane and environmental change during the Paleocene-Eocene thermal maximum (PETM): Modeling the PETM onset as a two-stage event

Details Methane and environmental change during the Paleocene-Eocene thermal maximum (PETM): Modeling the PETM onset as a two-stage event Methane and environmental change during the Paleocene-Eocene thermal maximum (PETM): Modeling the PETM onset as a two-stage event

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3805702c&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 5, CiteID L05702

Physics

Global Change: Abrupt/Rapid Climate Change (4901, 8408), Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), Biogeosciences: Paleoclimatology And Paleoceanography (3344, 4900), Biogeosciences: Carbon Cycling (4806), Biogeosciences: Modeling (1952, 4316)

Scientific paper

An atmospheric CH4 box model coupled to a global carbon cycle box model is used to constrain the carbon emission associated with the PETM and assess the role of CH4 during this event. A range of atmospheric and oceanic emission scenarios representing different amounts, rates, and isotopic signatures of emitted carbon are used to model the PETM onset. The first 3 kyr of the onset, a pre-isotope excursion stage, is simulated by the atmospheric release of 900 to 1100 Pg C CH4 with a δ13C of -22 to -30‰. For a global average warming of 3°C, a release of CO2 to the ocean and CH4 to the atmosphere totalling 900 to 1400 Pg C, with a δ13C of -50 to -60‰, simulates the subsequent 1-kyr isotope excursion stage. To explain the observations, the carbon must have been released over at most 500 years. The first stage results cannot be associated with any known PETM hypothesis. However, the second stage results are consistent with a methane hydrate source. More than a single source of carbon is required to explain the PETM onset.

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