Observation of volcanic degassing using ground-based imaging methods

Volcanic gas measurements are a crucial component of monitoring networks at active volcanoes around the world. They provide insight into the degasing mechanisms occurring in magma bodies and volcanic conduits and help constrain the contribution of volcanic emissions to the global input of climate forcing gases to the atmosphere. Recent advances in technology have given rise to new ways of monitoring those emissions from the ground, with increased temporal resolution and lower detection limits. Imaging methods in particular provide valuable contextual information and offer sampling frequencies comparable to classical geophysical methods such as seismic or deformation monitoring, opening the door for multi-disciplinary studies of degassing processes.  In this talk, I will present results from two ground-based remote sensing methods - a UV camera system and a hyperspectral IR imager - for quantifying SO₂ emissions at high temporal resolution (> 1Hz), and discuss their relative strengths and weaknesses.