COMET researchers at the University of Oxford have estimated the total carbon emissions emanating from the Eastern Rift – the eastern branch of the East African Rift, a zone near the horn of East Africa where the crust stretches and splits.
The new study published in Geochemistry, Geophysics, Geosystems, led by COMET PhD student Jonathan Hunt, working alongside Tamsin Mather and David Pyle as well as colleagues from Oxford and Addis Ababa University, Ethiopia, extrapolates from soil carbon dioxide surveys to estimate that the Eastern Rift emits somewhere between 3.9 and 32.7 million metric tons (Mt) of carbon dioxide each year.
The research demonstrates how, even near some seemingly inactive volcanoes, carbon dioxide from melted rock seeps out through cracks in the surrounding crust.
You can read more about the study on the Deep Carbon Observatory website.
The full reference is: Hunt JA, Zafu A, Mather TA, Pyle DM, Barry PH (2017) Spatially variable CO2 degassing in the Main Ethiopian Rift: Implications for magma storage, volatile transport and rift-related emissions. Geochemistry, Geophysics, Geosystems doi: 10.1002/2017GC006975