I understand that this paper is about Methane from Lakes and not about methane from Arctic Ocean.
So it is not about Gross Methane emissions. regards Bhaskar On May 28, 12:54 am, Mike MacCracken <[email protected]> wrote: > The attached (modeling) paper out of the MIT Joint Program Global Change > Group suggests that the methane permafrost feedback is likely to be pretty > small. The abstract reads: > > Permafrost degradation is likely enhanced by climate warming. Subsequent > landscape subsidence and hydrologic changes support expansion of lakes and > wetlands. Their anaerobic environments can act as strong emission sources of > methane and thus represent a positive feedback to climate warming. Using an > integrated earth-system model framework, which considers the range of policy > and uncertainty in climate change projections, we examine the influence of > near-surface permafrost thaw on the prevalence of lakes, its subsequent > methane emission, and potential feedback under climate warming. We find that > increases in atmospheric CH4 and radiative forcing from increased lake CH4 > emissions are small, particularly when weighed against unconstrained human > emissions. The additional warming from these methane sources, across the > range of climate policy and response, is no greater than 0.1 C by 2100. > Further, for this temperature feedback to be discernable by 2100 would > require at least an order of magnitude larger methane emission response. > Overall, the biogeochemical climate-warming feedback from boreal and Arctic > lake emissions is relatively small whether or not humans choose to constrain > global emissions. > > Let us hope this is the case. Comments? > > Mike MacCracken > > MITJPSPGC_Rpt218-Methane Feedback.pdf > 2685KViewDownload -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en.
