Preprints
https://doi.org/10.5194/amt-2021-356
https://doi.org/10.5194/amt-2021-356

  29 Nov 2021

29 Nov 2021

Review status: this preprint is currently under review for the journal AMT.

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

Gaia Pinardi1, Michel Van Roozendael1, François Hendrick1, Andreas Richter2, Pieter Valks3, Ramina Alwarda4, Kristof Bognar4,a, Udo Frieß5, José Granville1, Myojeong Gu6, Paul Johnston7, Cristina Prados-Roman8, Richard Querel7, Kimberly Strong4, Thomas Wagner6, Folkard Wittrock2, and Margarita Yela Gonzalez8 Gaia Pinardi et al.
  • 1Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Av Circulaire 3, 1180 Uccle, Belgium
  • 2Institute of Environmental Physics (IUPB), University of Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany
  • 3Deutsches Zentrum für Luft-und Raumfahrt (DLR), Institut für Methodik der Fernerkundung (IMF), Münchener Str. 20, D-82234, Oberpfaffenhofen, Germany
  • 4Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, M5S 1A7, Canada
  • 5Institute of Environmental Physics (IUPH), University of Heidelberg, Im Neuenheimer Feld 229, Heidelberg, Germany
  • 6Max-Planck-Institut für Chemie (MPIC), Hahn-Meitner-Weg 1, 55128 Mainz, Germany
  • 7National Institute of Water and Atmospheric Research (NIWA), Private Bag 50061, Omakau, Central Otago, New Zealand
  • 8Atmospheric Research and Instrumentation Branch, National Institute for Aerospace Technology (INTA), Madrid, 28850, Spain
  • anow at: Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Saskatchewan, Canada

Abstract. This paper reports on ground-based validation of the atmospheric OClO data record produced in the framework of EUMETSAT’s Satellite Application Facility on Atmospheric Chemistry Monitoring (AC SAF) using the GOME2-A and -B instruments over the 2007–2016 and 2013–2016 periods, respectively. OClO slant column densities are compared to correlative measurements collected from 9 NDACC Zenith-Scattered-Light DOAS (ZSL-DOAS) instruments 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 % between the different ground-based data analysis, reaching total uncertainties ranging from about 26 % to 33 % for the different stations. Time-series at the different sites show good agreement between satellite and ground-based data, both for the inter-annual variability and the overall OClO seasonal behavior. GOME-2A results are found to be nosier 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 of 0.64 and 0.72, respectively. Biases are within 8 x 1013 molec/cm2 with some differences between GOME-2A and GOME-2B, depending on the station. Overall, considering all the stations, a median bias of about −2.2 x 1013 molec/cm2 is found for both GOME-2 instruments.

Gaia Pinardi et al.

Status: open (until 18 Jan 2022)

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Gaia Pinardi et al.

Gaia Pinardi et al.

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Short summary
We report on the GOME-2A and GOME-2B OClO datasets (2007 to 2016, from the EUMETSAT’s AC SAF) validation using data from 9 NDACC Zenith-Scattered-Light DOAS (ZSL-DOAS) instruments distributed in both the Arctic and Antarctic. Specific sensitivity tests are performed on the ground-based data to estimate the impact of the different OClO DOAS analysis settings and their typical errors. Good agreement is found, both for the inter-annual variability and the overall OClO seasonal behaviour.