Regensburg 2016 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 12: Methods - Remote Sensing

UP 12.1: Vortrag

Donnerstag, 10. März 2016, 11:15–11:30, H41

Accurate prototype remote sensing of correlated CO₂ and SO₂ emissions at Mt.Etna — •Anna Solvejg Dinger¹, André Butz², Nicole Bobrowski^1,3, and HeiKa Team^1,2 — ¹IUP, University of Heidelberg, Germany — ²IMK-ASF, Karlsruhe Institute of Technology, Germany — ³University of Mainz, Germany

Volcanic carbon dioxide (CO₂) and sulfur dioxide (SO₂) emissions have a direct as well as an indirect impact on climate and air quality. Moreover the ratio of these two gases is a tracer for dynamic processes inside volcanoes and hence volcanic activity. Remote sensing of volcanic emissions allows for monitoring a volcano’s activity from a safe distance to the volcano. Further it enables sampling of cross sections of the entire plume, which suffer less from representativeness errors than common in-situ techniques. Remote sensing of SO₂ is well developed, whereas the measurement of volcanic CO₂ requires high accuracy in order to measure little concentration enhancements above the atmospheric background. We employed combined direct sunlight spectroscopy for SO₂ (UV-DOAS) and CO₂ (FTIR) during a three-week campaign at Mt.Etna, Sicily. The whole setup was installed on a mobile platform, which allowed for sampling plume cross sections in a stop-and-go pattern. We measured significant CO₂ column density enhancements, even though the enhancement was only slightly above the detection limit. Our measured volcanic CO₂ and SO₂ column densities show a strong correlation and their emission ratios are in the range of 5-15.