Volcano location could be greenhouse-icehouse key
http://news.rice.edu/2013/02/06/volcano-location-could-be-greenhouse-icehouse-key-2/[font face=Serif][font size=5]Volcano location could be greenhouse-icehouse key[/font]
Jade Boyd February 6, 2013
[font size=4]Study: Episodic purging of carbonate capacitor drives long-term climate cycle[/font]
[font size=3]A new Rice University-led study finds the real estate mantra location, location, location may also explain one of Earths enduring climate mysteries. The study suggests that Earths repeated flip-flopping between greenhouse and icehouse states over the past 500 million years may have been driven by the episodic flare-up of volcanoes at key locations where enormous amounts of carbon dioxide are poised for release into the atmosphere.
We found that Earths continents serve as enormous carbonate capacitors, said Rices Cin-Ty Lee, the lead author of the study in this months GeoSphere. Continents store massive amounts of carbon dioxide in sedimentary carbonates like limestone and marble, and it appears that these reservoirs are tapped from time to time by volcanoes, which release large amounts of carbon dioxide into the atmosphere.
Lee said as much as 44 percent of carbonates by weight is carbon dioxide. Under most circumstances that carbon stays locked inside Earths rigid continental crust.
One process that can release carbon dioxide from these carbonates is interaction with magma, he said. But that rarely happens on Earth today because most volcanoes are located on island arcs, tectonic plate boundaries that dont contain continental crust.
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http://dx.doi.org/10.1130/GES00822.1