Quantitative imaging of volcanic SO<sub>2</sub> plumes using Fabry–Pérot interferometer correlation spectroscopy
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Published:2021-01-14
Issue:1
Volume:14
Page:295-307
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Fuchs Christopher,Kuhn Jonas,Bobrowski Nicole,Platt Ulrich
Abstract
Abstract. We present first measurements with a novel imaging technique for atmospheric
trace gases in the UV spectral range. Imaging Fabry–Pérot interferometer
correlation spectroscopy (IFPICS) employs a Fabry–Pérot interferometer
(FPI) as the wavelength-selective element. Matching the FPI's distinct, periodic
transmission features to the characteristic differential absorption structures
of the investigated trace gas allows us to measure differential atmospheric
column density (CD) distributions of numerous trace gases with high spatial
and temporal resolution. Here we demonstrate measurements of sulfur dioxide
(SO2), while earlier model calculations show that bromine monoxide
(BrO) and nitrogen dioxide (NO2) are also possible. The high
specificity in the spectral detection of IFPICS minimises cross-interferences
to other trace gases and aerosol extinction, allowing precise determination of
gas fluxes. Furthermore, the instrument response can be modelled using
absorption cross sections and a solar atlas spectrum from the literature,
thereby avoiding additional calibration procedures, e.g. using gas cells. In a
field campaign, we recorded the temporal CD evolution of SO2 in the
volcanic plume of Mt. Etna, with an exposure time of 1 s and
400×400 pixel spatial resolution. The temporal resolution of the time
series was limited by the available non-ideal prototype hardware to about
5.5 s. Nevertheless, a detection limit of 2.1×1017 molec cm−2 could be reached, which is comparable to
traditional and much less selective volcanic SO2 imaging techniques.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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