Over geologic time, Earth’s atmosphere has changed. The carbon dioxide concentration of the atmosphere has cycled through periods of higher and lower concentration, which is correlated with variations in Earth’s climate. This variation, occurring over multi-million year timescales, is partially the result of changes in volcanic activity, with more or less CO2transferred between Earth’s deep mantle and the surface carbon system.
As the largest reservoir of carbon in Earth (the solid Earth contains about 10,000 times more carbon than the atmosphere and oceans), deep carbon is a key factor in controlling this long-term climate change. But what causes volcanic degassing to increase or decrease?
A new paper from Jonathan Burley and Richard Katz at the University of Oxford, UK, outlines a new model for carbon flux at mid-ocean ridges, and implicates changing sea level as an important driver of volcanic CO2 degassing [1].
Read more:
https://deepcarbon.net/feature/earth%E2%80%99s-glacial-cycles-affect-deep-carbon-cycle#.VbscCPntmko
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