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- Title
Ground-based validation of the MetOp-A and MetOp-B GOME-2 OClO measurements.
- Authors
Pinardi, Gaia; Van Roozendael, Michel; Hendrick, François; Richter, Andreas; Valks, Pieter; Alwarda, Ramina; Bognar, Kristof; Frieß, Udo; Granville, José; Gu, Myojeong; Johnston, Paul; Prados-Roman, Cristina; Querel, Richard; Strong, Kimberly; Wagner, Thomas; Wittrock, Folkard; Yela Gonzalez, Margarita
- 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 -2.2×1013 molec. cm -2 is found for both GOME-2 instruments.
- Subjects
ATMOSPHERIC composition; ATMOSPHERIC chemistry; REGRESSION analysis; OPTICAL spectroscopy; LIGHT absorption
- Publication
Atmospheric Measurement Techniques, 2022, Vol 15, Issue 11, p3439
- ISSN
1867-1381
- Publication type
Article
- DOI
10.5194/amt-15-3439-2022