Level 2 processor and auxiliary data for ESA Version 8 final fullmission analysis of MIPAS measurements on ENVISAT
Year: 2022
Authors: Raspollini P., Arnone E., Barbara F., Bianchini M., Carli B., Ceccherini S.,Chipperfield M.P., Dehn A., Della Fera S., Dinelli B.M., Dudhia A., J.M., Gai M., Kiefer M., Lupez-Puertas M., Moore D.P., Piro A., Remedios J.J., Ridolfi M., Sembhi H., Sgheri L., Zoppeti N.
Autors Affiliation: Consiglio Nazl Ric IFAC CNR, Ist Fis Applicata Nello Carrara, I-50019 Sesto Fiorentino, Italy; Consiglio Nazl Ric ISAC CNR, Lstituto Sci Atmosfera & Clima, I-40129 Bologna, Italy; Univ Turin, Dept Phys, I-10125 Turin, Italy; Consiglio Nazl Ric ISC CNR, Ist Sistemi Complessi, Sect Florence, Via Madonna Piano 10, I-50019 Sesto Fiorentino, Italy; Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England; Univ Leeds, Natl Ctr Earth Observat NCEO, Leeds LS2 9JT, W Yorkshire, England; ESA ESRIN, I-00044 Frascati, Italy; Univ Bologna, Dept Phys & Astron, I-40127 Bologna, Italy; Univ Oxford, Dept Phys, Oxford OX1 3PU, England; Univ Paris, Lab Interuniv Syst Atmospher LISA, UMR CNRS 7583, Univ Paris Est, F-94010 Paris, France; Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Karlsruhe, Germany; CSIC, Inst Astrofis Andalucia, Granada 18008, Spain; Univ Leicester, Natl Ctr Earth Observat NCEO, Leicester LE4 55B, Leics, England; Univ Leicester, Sch Phys & Astron, Leicester LE1 7RH, Leics, England; European Space Agcy ESA ESRIN, SERCO SpA, I-00044 Frascati, Italy; Consiglio Nazl Ric INO CNR, Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy; Consiglio Nazl Ric IAC CNR, Ist Applicaz Calcolo, Sect Florence, Via Madonna Piano 10, I-50019 Sesto Fiorentino, Italy; Inst Pierre Simon Laplace, 61 Ave Gen Gaulle, F-94010 Creteil, France.
Abstract: High quality long-term data sets of altitude-resolved measurements of the atmospheric composition areimportant because they can be used both to study the evolu-tion of the atmosphere and as a benchmark for future mis-sions. For the final ESA reprocessing of MIPAS (MichelsonInterferometer for Passive Atmospheric Sounding) on ENVISAT (ENViromental SATellite) data, numerous improve-ments were implemented in the Level 2 (L2) processor Op-timised Retrieval Model (ORM) version 8.22 (V8) and itsauxiliary data. The implemented changes involve all aspects of the processing chain, from the modelling of the measure-ments with the handling of the horizontal inhomogeneitiesalong the line of sight to the use of the optimal estimationtechnique to retrieve the minor species, from a more sensitive approach to detecting the spectra affected by cloudsto a refined method for identifying low quality products. Improvements in the modelling of the measurements werealso obtained with an update of the used spectroscopic dataand of the databases providing the a priori knowledge ofthe atmosphere. The HITRAN_mipas_pf4.45 spectroscopic database was finalised with new spectroscopic data verifiedwith MIPAS measurements themselves, while recently measured cross-sections were used for the heavy molecules. TheLevel 2 Initial Guess (IG2) data set, containing the clima-tology used by the MIPAS L2 processor to generate the ini-tial guess and interfering species profiles when the retrieved profiles from previous scans are not available, was improved taking into account the diurnal variation of the profiles defined using climatologies from both measurements and models. Horizontal gradients were generated using the ECMWFERA-Interim data closest in time and space to the MIPASdata. Further improv ements in the L2 V8 products derivedfrom the use of the L1b V8 products, which were upgraded to reduce the instrumental temporal drift and to handle theabrupt changes in the calibration gain. The improvements in-troduced into the ORM V8 L2 processor and its upgraded auxiliary data, together with the use of the L1b V8 products, lead to the generation of the MIPAS L2 V8 products, which are characterised by an increased accuracy, better temporal stability and a greater number of retrieved species.
Journal/Review: ATMOSPHERIC MEASUREMENT TECHNIQUES
Volume: 15 (6) Pages from: 1871 to: 1901
More Information: This research has been supported by ESA ESRIN (contract no. 4000112093/14/I/LG MIPAS) and CCN2 “Support to MIPAS Level 2 Product Validation Phase F”.KeyWords: Atmospheric composition, L2 analysis, MIPAS measurementsDOI: 10.5194/amt-15-1871-2022Citations: 6data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-17References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here