Groundwater depletion could be significant source of atmospheric carbon dioxide

[NickB79]

https://www.sciencedaily.com/releases/2017/11/171116132655.htm

Humans may be adding large amounts of carbon dioxide to the atmosphere by using groundwater faster than it is replenished, according to new research. This process, known as groundwater depletion, releases a significant amount of carbon dioxide into the atmosphere that has until now been overlooked by scientists in calculating carbon sources, according to the new study.

The study's authors estimate groundwater depletion in the United States could be responsible for releasing 1.7 million metric tons (3.8 billion pounds) of carbon dioxide to the atmosphere every year.

Based on these figures, groundwater depletion should rank among the top 20 sources of carbon emissions documented by the US Environmental Protection Agency (EPA) and the Intergovernmental Panel on Climate Change (IPCC). This would mean the carbon dioxide emitted through groundwater depletion is comparable to the carbon generated from aluminum, glass, and zinc production in the United States, according to the study's authors.

"We were somewhat surprised that this hasn't been accounted for in the literature and in the [EPA and IPCC] evaluations," said David Hyndman, a hydrogeologist at Michigan State University in East Lansing, Michigan and co-author of the new study accepted for publication in Earth's Future, a journal of the American Geophysical Union.

[Nitram]

1. I haven't seen this before. What is the mechanism for the connection between depletion of

groundwater and release of CO2?