Major Source of Atmospheric Methane Identified Near Arctic Lakes
by Jeremy Elton Jacquot, Los Angeles on 10.30.07
Talk about your ugly positive feedbacks: according to a team of researchers based at the University of Alaska, Fairbanks, a source of methane - which likely originated during the last ice age - has surfaced in the Arctic, a likely result of global warming's thawing effect on the permafrost. Methane bubbling from this source could have accounted for up to 87% of the observed spike in atmospheric methane.
“It tells us that this isn’t just something that is ongoing now. It would have been a positive feedback to climate warming then, as it is today. We estimate that as much as 10 times the amount of methane that is currently in the atmosphere will come out of these lakes as permafrost thaws in the future. The timing of this emission is uncertain, but likely we are talking about a time frame of hundreds to thousands of years, if climate warming continues as projected,” said lead scientist, Katey Walter, whose study appeared in last week's issue of Science.
Scientists had previously discovered that a rapid increase in atmospheric methane levels in the early Holocene was caused by an "unidentified northern source". Past studies had suggested that gas hydrates or wetlands could have been to blame for the spike; Walter's research has now shown that methane bubbling from thermokarst lakes was a major source.
The lakes, which form when the surrounding permafrost thaws, "really flared up ... emitting huge amounts of methane," Walter concluded. "All that carbon that had been locked up in the ground for thousands of years is converted to potent greenhouse gases: methane and carbon dioxide ... This suggests that large releases from lakes may occur again in the future with global warming.”
Via ::ScienceDaily: Methane Bubbling From Arctic Lakes, Now And At End Of Last Ice Age (news website)
See also: ::Waste Management Investing US$400 Million In Methane To Electricity Projects, ::Burning Methane Could Improve Hydro-Electric Power, ::Hydrogen + Methane = Hythane
Horrible news. All of these positive feedback mechanisms are really depressing and making it hard to stay positive about the future. But here is my feeble attempt to remain positive: maybe some smart cookie can find a way for us to tap those lakes so as to extract that methane as a source of energy? I hope so. We could lessen the impacts of this positive feedback and reduce our dependence on fossil fuels.
There are a lot of feedback systems being triggered now -- couple this with the news that the Wild Pug population is under severe threat, and global warming is having a bang-up news day:
http://www.humblenarrator.com/2007/10/30/wild-pug-habitat-threatened-due-to-global-warming/
Can we tap it and use it as a substitute for deep-drill natural gas? If it's going to come out of the ground anyway, maybe it would make sense to draw it off, use it, and release it as CO2. Methane is a much more dangerous greenhouse gas than CO2, and if we can displace natural gas from deep wells we might actually realize a net energy gain.
May you please send me information regarding this topic: Ultraviolet and ozne depletion as major sources of atmospheric pollution.