Bob Berwyn.–“New study shows soil moisture is a big factor in global warming equation.

“Methane won’t be the only problem as Arctic permafrost thaws in the coming decades. A new study shows that, as frozen permafrost areas warm and dry out, they will also release more CO2. The study was led by Northern Arizona University assistant research professor Christina Schädel and published in the journal Nature Climate Change.

“The findings show that a 10 degree Celsius increase in soil temperature released twice as much carbon into the atmosphere, and drier, aerobic soil conditions released more than three times more carbon than wetter, anaerobic soil conditions.

“Our results show that increasing temperatures have a large effect on carbon release from permafrost but that changes in soil moisture conditions have an even greater effect,” said Schädel. “We conclude that the permafrost carbon feedback will be stronger when a larger percentage of the permafrost zone undergoes thaw in a dry and oxygen-rich environment.”

“The study was part of an ongoing effort to quantify greenhouse gas releases from thawing permafrost, a critical part of the global warming equation because so much carbon is currently locked up in frozen organic soils in the Arctic. Much of the data came from the international Permafrost Carbon Network that Schädel co-leads with Northern Arizona University professor of ecosystem ecology, Ted Schuur.”  Continue reading:  How much CO2 will melting permafrost release? | Summit County Citizens Voice

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