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Sulfur dioxide retrievals from TROPOMI onboard Sentinel-5 Precursor: algorithm theoretical basis

Theys, Nicolas and De Smedt, Isabelle and Yu, Huan and Danckaert, Thomas and van Gent, Jeroen and Hörmann, Christoph and Wagner, Thomas and Hedelt, Pascal and Bauer, Heiko and Romahn, Fabian and Pedergnana, Mattia and Loyola, Diego and Van Roozendael, Michel (2017) Sulfur dioxide retrievals from TROPOMI onboard Sentinel-5 Precursor: algorithm theoretical basis. Atmospheric Measurement Techniques (AMT) (10), pp. 119-153. Copernicus Publications. doi: 10.5194/amt-10-119-2017. ISSN 1867-1381.

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Official URL: https://www.atmos-meas-tech.net/10/119/2017/


The TROPOspheric Monitoring Instrument (TROPOMI) onboard the Copernicus Sentinel-5 Precursor (S-5P) platform will measure ultraviolet earthshine radiances at high spectral and improved spatial resolution (pixel size of 7 km  ×  3.5 km at nadir) compared to its predecessors OMI and GOME-2. This paper presents the sulfur dioxide (SO2) vertical column retrieval algorithm implemented in the S-5P operational processor UPAS (Universal Processor for UV/VIS Atmospheric Spectrometers) and comprehensively describes its various retrieval steps. The spectral fitting is performed using the differential optical absorption spectroscopy (DOAS) method including multiple fitting windows to cope with the large range of atmospheric SO2 columns encountered. It is followed by a slant column background correction scheme to reduce possible biases or across-track-dependent artifacts in the data. The SO2 vertical columns are obtained by applying air mass factors (AMFs) calculated for a set of representative a priori profiles and accounting for various parameters influencing the retrieval sensitivity to SO2. Finally, the algorithm includes an error analysis module which is fully described here. We also discuss verification results (as part of the algorithm development) and future validation needs of the TROPOMI SO2 algorithm.

Item URL in elib:https://elib.dlr.de/113961/
Document Type:Article
Title:Sulfur dioxide retrievals from TROPOMI onboard Sentinel-5 Precursor: algorithm theoretical basis
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Theys, Nicolasnicolast (at) aeronomie.beUNSPECIFIED
De Smedt, Isabelleisabelle.desmedt (at) aeronomie.beUNSPECIFIED
Yu, Huanhuan.yu (at) aeronomie.beUNSPECIFIED
Danckaert, Thomasthomas.dankaert (at) aeronomie.beUNSPECIFIED
van Gent, Jeroenjeroen.vangent (at) aeronomie.beUNSPECIFIED
Hörmann, Christophmax-planck-institut für chemie, mainzUNSPECIFIED
Wagner, Thomasmax-planck-institut für chemie, mainzUNSPECIFIED
Hedelt, PascalPascal.Hedelt (at) dlr.dehttps://orcid.org/0000-0002-1752-0040
Romahn, Fabianfabian.romahn (at) dlr.deUNSPECIFIED
Pedergnana, Mattiamattia.pedergnana (at) dlr.deUNSPECIFIED
Loyola, DiegoDiego.Loyola (at) dlr.dehttps://orcid.org/0000-0002-8547-9350
Van Roozendael, Michelmichel.vanroozendael (at) aeronomie.beUNSPECIFIED
Journal or Publication Title:Atmospheric Measurement Techniques (AMT)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.5194/amt-10-119-2017
Page Range:pp. 119-153
Publisher:Copernicus Publications
Keywords:Sulfur dioxide, retrieval, remote sensing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Hedelt, Pascal
Deposited On:08 Sep 2017 13:20
Last Modified:08 Mar 2018 18:10

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