While this number is higher than the previous estimate made in the late 1990s based on ground measurements, the new research includes data on more volcanoes, including some that scientists have never visited, and it is still lower than human emissions of sulfur dioxide pollution levels. He led the effort to catalogue sulfur dioxide emissions sources from human activities and volcanoes and to trace emissions derived from the satellite observations back to their source by using wind data. With daily observations, tracking sulfur dioxide emissions via satellite can also help with eruption forecasting.
Along with measuring seismic activity and ground deformation, scientists monitoring satellite data can potentially pick up noticeable increases in gas emissions that may precede eruptions. The satellite data could allow us to target new ground-based measurements at unmonitored volcanoes more effectively, leading to better estimates of volcanic carbon dioxide emissions. The work highlights the necessity of consistent long-term data, according to co-author Nick Krotkov, an atmospheric scientist at NASAs Goddard Space Flight Center in Greenbelt, Maryland, which produces the sulfur dioxide data from the Aura satellite. https://www.sciencedaily.com/releases/2017/03/170309150624.htm
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