Global emission of carbon dioxide by subaerial volcanoes is calculated, using CO2 SO2 from volcanic gas analyses and SO2 flux, to be 34 ± 24 × 10l2 g CO2 yr from passive degassing and 31 ± 22 × 1012 g CO2 yr from eruptions. Volcanic CO2 presently represents only 0.22% of anthropogenic emissions but may have contributed to significant "greenhouse" effects at times in Earth history. Models of climate response to CO2 increases may be tested against geological data.
ASJC Scopus subject areas
- Geochemistry and Petrology