Retrieval algorithm for OClO from TROPOMI (TROPOspheric Monitoring Instrument) by differential optical absorption spectroscopy
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Published:2021-12-07
Issue:12
Volume:14
Page:7595-7625
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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:
Puķīte Jānis, Borger ChristianORCID, Dörner SteffenORCID, Gu Myojeong, Frieß UdoORCID, Meier Andreas Carlos, Enell Carl-FredrikORCID, Raffalski UweORCID, Richter AndreasORCID, Wagner Thomas
Abstract
Abstract. Here we present a new retrieval algorithm of the slant column densities (SCDs)
of chlorine dioxide (OClO) by differential optical absorption spectroscopy (DOAS) from measurements performed by
TROPOspheric Monitoring Instrument (TROPOMI) on board of
Sentinel-5P satellite. To achieve a substantially improved accuracy, which is
especially important for OClO observations, accounting for absorber and pseudo
absorber structures in optical depth even of the order of 10−4 is
important. Therefore, in comparison to existing retrievals, we include several
additional fit parameters by accounting for spectral effects like the temperature
dependency of the Ring effect and Ring absorption effects, a higher-order term
for the OClO SCD dependency on wavelength and accounting for the BrO absorption. We investigate the performance of different retrieval settings by an error
analysis with respect to random variations, large-scale systematic variations
as a function of solar zenith angle and also more localized systematic
variations by a novel application of an autocorrelation analysis. The retrieved TROPOMI OClO SCDs show a very good agreement with ground-based
zenith sky measurements and are correlated well with preliminary data of the
operational TROPOMI OClO retrieval algorithm currently being developed as part
of ESA's Sentinel-5P+ Innovation project.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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