Preprints
https://doi.org/10.5194/amt-2021-215
https://doi.org/10.5194/amt-2021-215

  16 Sep 2021

16 Sep 2021

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

The ESA MIPAS/ENVISAT Level2-v8 dataset: 10 years of measurements retrieved with ORM v8.22

Bianca Maria Dinelli1,, Piera Raspollini2,, Marco Gai2,, Luca Sgheri3, Marco Ridolfi4, Simone Ceccherini2, Flavio Barbara2, Nicola Zoppetti2, Elisa Castelli1, Enzo Papandrea1, Paolo Pettinari1,5, Angelika Dehn6, Anu Dudhia7, Michael Kiefer8, Alessandro Piro9, Jean-Marie Flaud10, Manuel Lopez-Puertas11, David Moore12, John Remedios12, and Massimo Bianchini13 Bianca Maria Dinelli et al.
  • 1CNR-ISAC – Istituto di Scienze dell’Atmosfera e del Clima del Consiglio Nazionale delle Ricerche, Via Gobetti, 101 – 40129 Bologna, Italy
  • 2CNR-IFAC – Istituto di Fisica Applicata “Nello Carrara” del Consiglio Nazionale delle Ricerche, Via Madonna del Piano, Via Madonna del Piano, 10 – 50019 Sesto Fiorentino (FI), Italy
  • 3CNR-IAC – Istituto per le Applicazioni del Calcolo Mauro Picone del Consiglio Nazionale delle Ricerche, Via Madonna del Piano, 10 – 50019 Sesto Fiorentino (FI), Italy
  • 4CNR-INO – Via Madonna del Piano, 10 – 50019 Sesto Fiorentino (FI), Italy
  • 5Dipartimento di Fisica e Astronomia - Universita’ di Bologna, Bologna, Italy
  • 6ESA-ESRIN, Frascati, (Rome), Italy
  • 7Atmospheric, Oceanic and Planetary Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK
  • 8Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Karlsruhe, Germany
  • 9Serco Italia S.p.A., Frascati, (Rome), Italy
  • 10LISA - Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR CNRS 7583, Université de Paris et Université Paris Est Créteil, Institut Pierre Simon Laplace (IPSL), 61 Avenue du Général de Gaulle, F-94010 Créteil Cedex, France
  • 11Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía s/n, 18008 Granada, Spain
  • 12University of Leicester, Physics and Astronomy, Leicester, UK
  • 13CNR-ISC – Istituto dei Sistemi Complessi del Consiglio Nazionale delle Ricerche, Section of Florence, Italy
  • These authors contributed equally to this work.

Abstract. The observations acquired during the full mission of the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) instrument, on board the European Space Agency ENVISAT satellite, have been analysed with version 8.22 of the Optimised Retrieval Model (ORM), originally developed as the scientific prototype of the ESA level 2 processor for MIPAS observations. The results of the analyses have been included into the MIPAS level 2 version 8 (level2-v8) database containing atmospheric fields of pressure, temperature and volume mixing ratio of MIPAS main targets H2O, O3, HNO3, CH4, N2O, and NO2, along with the minor gases CFC-11, ClONO2, N2O5, CFC-12, COF2, CCl4, CF4, HCFC-22, C2H2, CH3Cl, COCl2, C2H6, OCS, HDO. The database covers all the measurements acquired by MIPAS in the nominal measurement mode of the Full Resolution (FR) part of the mission (from July 2002 to March 2004) and all the observation modes of the Optimised Resolution (OR) part (from January 2005 to April 2012). The number of species included in the MIPAS level2-v8 data-set makes it of particular importance for the studies of stratospheric chemistry. The database is considered by ESA the final release of the MIPAS level 2 products. The ORM algorithm is operated at the vertical grid coincident to the tangent altitudes of the observations or to a subset of them, spanning (in the nominal mode) the altitude range from 6 to 68 km in the FR phase and from 6 to 70 km in the OR period. In the latitude domain, FR profiles are spaced by about 4.7 degrees while the OR profiles are spaced by about 3.7 degrees. For each retrieved species the auxiliary data and the retrieval choices are described. Each product is characterised in terms of the retrieval error, spatial resolution, and 'useful' vertical range in both phases of the MIPAS mission. These depend on the characteristics of the measurements (spectral and vertical resolution of the measurements), on the retrieval choices (number of spectral points included in the analyses, number of altitudes included in the vertical retrieval grid), and on the information content of the measurements for each trace species. For temperature, water vapour, ozone and nitric acid the number of degrees of freedom is significantly larger in the OR phase than in the FR one, mainly due to the finer vertical measurement grid. In the FR phase some trace species are characterised by a smaller retrieval error with respect to the OR phase, mainly due to the larger number of spectral points used in the analyses, along with the reduced vertical resolution. The way of handling possible caveats (negative VMR, vertical grid representation) is discussed. The quality of the retrieved profiles is assessed through four criteria, two providing information on the successful convergence of the retrieval iterations, one on the capability of the retrieval to reproduce the measurements, and one on the presence of outliers. An easy way to identify and filter the problematic profiles with the information contained in the output files is provided. MIPAS level2-v8 data are available to the scientific community through the ESA portal https://earth.esa.int/eogateway/.

Bianca Maria Dinelli et al.

Status: open (until 21 Oct 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-215', Ellis Remsberg, 17 Sep 2021 reply
  • RC2: 'Comment on amt-2021-215', Joern Ungermann, 06 Oct 2021 reply

Bianca Maria Dinelli et al.

Bianca Maria Dinelli et al.

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Short summary
The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) instrument, on board the European Space Agency ENVISAT satellite, level 2 version 8 database, containing atmospheric fields of pressure, temperature and volume mixing ratio of 21 trace gases, is described in this paper. The database covers all the measurements acquired by MIPAS (from July 2002 to April 2012). The number of species included makes it of particular importance for the studies of stratospheric chemistry.