Global distribution of ozone vertical profiles retrieved from NOMAD-UVIS/TGO, presented in Piccialli et al. 2023

This dataset is presented in "Ozone observed by TGO/NOMAD-UVIS solar occultation: an inter-comparison of three retrieval methods" by A. Piccialli, A.C. Vandaele, et al. 2023.:

Each file name indicates the retrieval method:

  • FOEM: Full occultation Optimal Estimation Method
  • OP: Onion Peeling
  • DOP: Direct Onion Peeling

Files are in the HDF5 format. Each file contains:


  • LST = local solar time [hrs]
  • Ls = solar longitude [degree]
  • lat = latitude [degree]
  • lon = longitude [degree]
  • orbit = file name of each occultation
  • day = day of observation
  • month = month of observation
  • year = year of observation


  • For each entry: [number of columns = number of occultations analyzed, number of rows = 600 (altitude grid)]
  • Nd_O3 = ozone number density [cm-3]
  • Nd_O3_Err = error on ozone number density [cm-3]
  • z = altitude above aeroid [km]

Filtering (present only if relevant to the method):

  • DoF = Degree of Freedom
  • DL = detection limit [cm-3]
  • chi2_O3 = chi2 of the retrieval including ozone
  • chi2_no_O3 = chi2 of the retrieval without ozone

The filtering criteria Delta_chi2 described in our paper is derived as:

  • Delta_chi2 = chi2_no_O3/chi2_O3

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Cite this as (APA format)

Piccialli, A., & Vandaele, A. C. (2022). Global distribution of ozone vertical profiles retrieved from NOMAD-UVIS/TGO, presented in Piccialli et al. 2023 (Version 1) [Data set]. Royal Belgian Institute for Space Aeronomy.
Retrieved: 21:33 16 Jul 2024 (UTC)
Users of this data are kindly encouraged to contact the author(s) for help and cooperation towards further successful data utilisation.



Piccialli, Ariannaorcid, Royal Belgian Institute for Space Aeronomy


Vandaele, Ann Carineorcid, Royal Belgian Institute for Space Aeronomy;

Maintainer data-contact of Royal Belgian Institute for Space Aeronomy

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Funding details
  • The NOMAD experiment is led by the Royal Belgian Institute for Space Aeronomy (IASB-BIRA), with Co-PI teams in the United Kingdom (Open University), Spain (IAA-CSIC) and Italy (INAF-IAPS).
  • This project has received funding from the European Union's Horizon 2020 research and innovation programme under Grant agreement No 101004052.
  • This work was supported by the NASA's Mars Program Office under WBS 604796, “Participation in the TGO/NOMAD Investigation of Trace Gases on Mars.” The material was based upon the work supported by the NASA under award No. 80GSFC21M0002.
  • The authors acknowledge funding from the UK Space Agency through Grants ST/V002295/1, ST/V005332/1, and ST/S00145X/1. AM acknowledges the support from the French Space Agency CNES. JJLM acknowledges financial support from the State Agency for Research of the Spanish MCIU through the “Center of Excellence Severo Ochoa” award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709) and by Grant PGC2018-101836-B-100 funded by MCIU/AEI/10.13039/501100011033 and by “ERDF A way of making Europe.”
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Last Updated July 4, 2024, 09:18 (UTC)
Created April 25, 2022, 00:00 (UTC)