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UP: Fachverband Umweltphysik
UP 2: Volcanic Effects on Atmosphere and Climate
UP 2.4: Talk
Wednesday, March 22, 2023, 12:00–12:15, MOL/0213
Highly resolved volcanic SO2 emission flux measurements with imaging Fabry-Perot interferometer correlation spectroscopy — •Jaro Heimann1, Alexander Nies1,2, Christopher Fuchs1,3, Jonas Kuhn1, Nicole Bobrowski1,4, and Ulrich Platt1 — 1Institute of Environmental Physics, Heidelberg University, Germany — 2CNRS/University Orleans, France — 3ETH Zurich, Zurich, Switzerland — 4INGV, Catania, Italy
Imaging Fabry-Perot interferometer (FPI) correlation spectroscopy (IFPICS) is a robust and mobile imaging technology, to study volcanic trace gas emissions with high temporal resolution and accuracy. The FPI provides a periodic transmission spectrum which is matched to the periodic narrowband absorption structure of the target trace gas (due to vibronic excitations in the UV). From the resulting data an image of trace gas column density can be inferred via an instrument model. Since the image acquisition takes about 2.4s for an image, it is possible to calculate emission fluxes on this timescale.
Here we present SO2 flux measurements from July 2022 at Mt. Etna with an IFPICS instrument with a detection limit of ≈ 5e17 molec/cm2 at 4 Megapixel spatial and 2.4s temporal resolution, e.g. a mean flux of 418 ± 138 t/day−1 for the 15th of July 2021 between 08:17 and 10:13 UTC. We will furthermore discuss uncertainties and challenges of the technique.