Ground-based validation of the MetOp-A and MetOp-B GOME-2 OClO measurements

This paper reports on ground-based validation of the atmospheric OClO data record produced within the framework of EUMETSAT's Satellite Application Facility on Atmospheric Chemistry Monitoring (AC SAF) using the Global Ozone Monitoring Experiment (GOME)-2A and GOME-2B instrument measurements, c...

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Main Authors: Pinardi, Gaia (Author) , Roozendael, Michel van (Author) , Hendrick, François (Author) , Richter, Andreas (Author) , Valks, Pieter (Author) , Alwarda, Ramina (Author) , Bognar, Kristof (Author) , Frieß, Udo (Author) , Granville, José (Author) , Gu, Myojeong (Author) , Johnston, Paul (Author) , Prados-Román, Cristina (Author) , Querel, Richard (Author) , Strong, Kimberly (Author) , Wagner, Thomas (Author) , Wittrock, Folkard (Author) , Yela Gonzalez, Margarita (Author)
Format: Article (Journal)
Language:English
Published: 09 Jun 2022
In: Atmospheric measurement techniques
Year: 2022, Volume: 15, Issue: 11, Pages: 3439-3463
ISSN:1867-8548
DOI:10.5194/amt-15-3439-2022
Online Access:Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.5194/amt-15-3439-2022
Verlag, lizenzpflichtig, Volltext: https://amt.copernicus.org/articles/15/3439/2022/
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Author Notes:Gaia Pinardi, Michel Van Roozendael, François Hendrick, Andreas Richter, Pieter Valks, Ramina Alwarda, Kristof Bognar, Udo Frieß, José Granville, Myojeong Gu, Paul Johnston, Cristina Prados-Roman, Richard Querel, Kimberly Strong, Thomas Wagner, Folkard Wittrock, and Margarita Yela Gonzalez

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520 |a This paper reports on ground-based validation of the atmospheric OClO data record produced within the framework of EUMETSAT's Satellite Application Facility on Atmospheric Chemistry Monitoring (AC SAF) using the Global Ozone Monitoring Experiment (GOME)-2A and GOME-2B instrument measurements, covering the 2007–2016 and 2013–2016 periods, respectively. OClO slant column densities are compared to correlative measurements collected from nine Zenith-Scattered-Light Differential Optical Absorption Spectroscopy (ZSL-DOAS) instruments from the Network for the Detection of Atmospheric Composition Change (NDACC) distributed in both the Arctic and Antarctic. Sensitivity tests are performed on the ground-based data to estimate the impact of the different OClO DOAS analysis settings. On this basis, we infer systematic uncertainties of about 25 % (i.e., about 3.75×1013 molec. cm−2) between the different ground-based data analyses, reaching total uncertainties ranging from about 26 % to 33 % for the different stations (i.e., around 4 to 5×1013 molec. cm−2). Time series at the different sites show good agreement between satellite and ground-based data for both the inter-annual variability and the overall OClO seasonal behavior. GOME-2A results are found to be noisier than those of GOME-2B, especially after 2011, probably due to instrumental degradation effects. Daily linear regression analysis for OClO-activated periods yield correlation coefficients of 0.8 for GOME-2A and 0.87 for GOME-2B, with slopes with respect to the ground-based data ensemble of 0.64 and 0.72, respectively. Satellite minus ground-based offsets are within 8×1013 molec. cm−2, with some differences between GOME-2A and GOME-2B depending on the station. Overall, considering all the stations, a median offset of about  -2.2 x 10 13 molec. cm−2 is found for both GOME-2 instruments. 
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