The ESA MIPAS/Envisat level2-v8 dataset: 10 years of measurements retrieved with ORM v8.22
Year: 2021
Authors: Dinelli B.M., Raspollini P., Gai M., Sgheri L., Ridolfi M., Ceccherini S., Barbara F., Zoppetti N., Castelli E., Papandrea E., Pettinari P., Dehn A., Dudhia A., Kiefer M., Piro A., Flaud JM., Lupez-Puertas M., Moore D., Remedios J., Bianchini M.
Autors Affiliation: CNR, CNR ISAC Ist Sci Atmosfera & Clima, Via Gobetti 101, I-40129 Bologna, Italy; CNR, CNR IFAC Ist Fis Applicata Nello Carrara, Via Madonna Piano 10, I-50019 Sesto Fiorentino, Italy; CNR, CNR IAC Ist Applicaz Calcolo Mauro Picone, Via Madonna Piano 10, I-50019 Sesto Fiorentino, Italy; CNR, CNR INO Ist Nazl Ott, Via Madonna Piano 10, I-50019 Sesto Fiorentino, Italy; Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy; European Space Agcy ESA ESRIN, Via Galileo Galilei, I-00044 Frascati, Italy; Univ Oxford, Clarendon Lab, Atmospher Ocean & Planetary Phys, Parks Rd, Oxford OX1 3PU, England; Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Karlsruhe, Germany; SERCO Italia Spa, Via Sciadonna 24, I-00044 Frascati, Italy; Univ Paris, UMR CNRS 7583, Lab Interuniv Syst Atmospher LISA, 61 Ave Gen de Gaulle, F-94010 Creteil, France; Univ Paris Est Creteil, Inst Pierre Simon Laplace IPSL, 61 Ave Gen de Gaulle, F-94010 Creteil, France; Inst Astrofis Andalucia IAA CSIC, Glorieta Astron S-N, Granada 18008, Spain; Univ Leicester, Phys & Astron, Leicester, Leics, England; CNR, CNR ISC Ist Sistemi Complessi, Via Madonna Piano 10, I-50019 Sesto Fiorentino, Italy.
Abstract: The observations acquired during the full mission of the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) instrument, aboard the European Space Agency Environmental Satellite (Envisat), 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 MI- PAS level-2 version 8 (level2-v8) database containing atmospheric fields of pressure, temperature, and volume mixing ratio (VMR) of MIPAS main targets H2 O, O3 , HNO3 , CH4 , N2 O, and NO2 , along with the minor gases CFC- 11, ClONO2 , N2 O5 , CFC-12, COF2 , CCl4 , CF4 , HCFC-22, C2 H2 , CH3 Cl, COCl2 , C2 H6 , OCS, and 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 dataset 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 alti- tude range from 6 to 68km in the FR phase and from 6 to 70 km in the OR period. In the latitude domain, FR profiles are spaced by about 4.7o, while the OR profiles are spaced by about 3.7o. 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), the retrieval choices (number of spectral points in- cluded in the analyses, number of altitudes included in the vertical retrieval grid), and 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 informa- tion contained in the output files is provided. MIPAS level2- v8 data are available to the scientific community through the ESA portal (https://doi.org/10.5270/EN1-c8hgqx4).
Journal/Review: ATMOSPHERIC MEASUREMENT TECHNIQUES
Volume: 14 Pages from: 7975 to: 7998
More Information: This research has been supported by the ESA ESRIN contract no. 4000112093/14/I/LG MIPAS and CCN2 “Support to MIPAS Level 2 Product Validation Phase F” and the State Agency for Research of the Spanish MCIU (grant no. PID2019110689RB-I00/AEI/10.13039/501100011033).KeyWords: composizione atmosferica, MIPASDOI: 10.5194/amt-14-7975-2021ImpactFactor: 4.184Citations: 8data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-24References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here
