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

• Verfasst von: Pinardi, Gaia [VerfasserIn]
• Verfasst von: Van Roozendael, Michel [VerfasserIn]
• Verfasst von: Hendrick, François [VerfasserIn]
• Verfasst von: Richter, Andreas [VerfasserIn]
• Verfasst von: Valks, Pieter [VerfasserIn]
• Verfasst von: Alwarda, Ramina [VerfasserIn]
• Verfasst von: Bognar, Kristof [VerfasserIn]
• Verfasst von: Frieß, Udo [VerfasserIn]
• Verfasst von: Granville, José [VerfasserIn]
• Verfasst von: Gu, Myojeong [VerfasserIn]
• Verfasst von: Johnston, Paul [VerfasserIn]
• Verfasst von: Prados-Román, Cristina [VerfasserIn]
• Verfasst von: Querel, Richard [VerfasserIn]
• Verfasst von: Strong, Kimberly [VerfasserIn]
• Verfasst von: Wagner, Thomas [VerfasserIn]
• Verfasst von: Wittrock, Folkard [VerfasserIn]
• Verfasst von: Yela Gonzalez, Margarita [VerfasserIn]
• Titel: Ground-based validation of the MetOp-A and MetOp-B GOME-2 OClO measurements
• Verf.angabe: 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
• E-Jahr: 2022
• Jahr: 09 Jun 2022
• Umfang: 25 S.
• Fussnoten: Gesehen am 19.07.2022
• Titel Quelle: Enthalten in: Atmospheric measurement techniques
• Ort Quelle: Katlenburg-Lindau : Copernicus, 2008
• Jahr Quelle: 2022
• Band/Heft Quelle: 15(2022), 11, Seite 3439-3463
• ISSN Quelle: 1867-8548
• DOI: doi:10.5194/amt-15-3439-2022
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1810843499

Abstract

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.