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2022 Articolo in rivista open access

Retrieval of Tropospheric Water Vapor From Airborne Far-Infrared Measurements: A Case Study

Warwick L. ; Brindley H. ; Di Roma A. ; Fox S. ; Havemann S. ; Murray J. ; Oetjen H. ; Price H. C. ; Schuttemeyer D. ; Sgheri L. ; Tiddeman D. A.

We describe studies undertaken in support of the Far-infrared Outgoing Radiation Understanding and Monitoring mission, European Space Agency's ninth Earth Explorer, designed to investigate whether airborne observations of far-infrared radiances can provide beneficial information on mid and upper tropospheric water vapor concentrations. Initially we perform a joint temperature and water vapor retrieval and show that the water vapor retrieval exploiting far-infrared measurements from the Tropospheric Airborne Fourier Transform Spectrometer (TAFTS) shows improvement over the a-priori Unified Model global forecast when compared to in situ dropsonde measurements. For this case the improvement is particularly noticeable in the mid-upper troposphere. Equivalent retrievals using mid-infrared radiances measured by the Airborne Research Interferometer Evaluation System (ARIES) show much reduced performance, with the degrees of freedom for signal (DFS), reduced by a factor of almost 2. Further sensitivity studies show that this advantage is decreased, but still present when the spectral resolution of the TAFTS measurements is reduced to match that of ARIES. The beneficial role of the far infrared for this case is further confirmed by performing water vapor only retrievals using ARIES and TAFTS individually, and then in combination. We find that the combined retrieval has a DFS value of 6.7 for water vapor, marginally larger than that obtained for the TAFTS retrieval and almost twice as large as that obtained for ARIES. These results provide observational support of theoretical studies highlighting the potential improvement that far-infrared observations could bring for the retrieval of tropospheric water vapor.

far-infrared remote sensing water vapor
CNR IRIS
2019 Rapporto di ricerca / Relazione scientifica restricted access

Earth Explorer 9 Candidate Mission FORUM -- Report for Mission Selection

This report is based on contributions from the FORUM Mission Advisory Group MAGHelen Brindley Imperial College London ; UKStefan A Buehler University of Hamburg ; DEDorothee Coppens EUMETSAT ; INTAdrien Deschamps CNES ; FRSteven Dewitte Royal Meteorological Institute of Belgium ; BEBianca M Dinelli ISACCNR ; ITLaurent Labonnote University of Lille ; FRQuentin Libois MétéoFrance ; FRMartin Mlynczak NASA Langley Research Center ; USLuca Palchetti INOCNR ; ITMarco Ridolfi University of Bologna ; ITMartin Riese Forschungszentrum Jülich ; DERoger Saunders Met Office ; UKThe scientific content of the report was compiled by Hilke Oetjen Scientific Coordinator ; based on inputs derived from the MAG ; supporting scientific studies ; campaignactivities ; with contributions from Richard Bantges ; Marco Barucci ; Claudio Belotti ; Giovanni Bianchini ; Elisa Castelli ; Simone Ceccherini ; Bertrand Cluzet ; Mathieu Compiègne ; Ugo Cortesi ; William Cossich ; Francesco D'Amato ; Samuele Del Bianco ; MohamadouAbdoulaye Diallo ; Gianluca Di Natale ; Alessio Di Roma ; Marie Dumont ; Marco Gai ; DinaKhordakova ; Lukas Kluft ; Tiziano Maestri ; Davide Magurno ; Alessio Montori ; Jonathan EMurray ; Piera Raspollini ; Markus Rettinger ; Christian Rolf ; Jacqueline E Russell ; LucaSgheri ; Ralf Sussmann ; Silvia Viciani ; Jérôme Vidot ; Hannes Vogelmann ; Laura Warwick ; the UK FAAM team ; the UK MetOffice ; Dirk SchuettemeyerThe technical content of the report was compiled by Bernardo Carnicero DomínguezTechnical Coordinator ; Charlotte Pachot Payload Technical Coordinator withcontributions from Itziar Barat ; Paolo Bensi ; Christophe Caspar ; Miguel Copano ; MauroFederici ; Dulce Lajas ; Flavio Mariani ; Vasco Pereira ; Stefanie Riel ; Gonçalo Rodrigues ; Bernd Sierk ; Kate Symonds ; Andrea Tromba ; based on inputs derived from the industrialPhase A system ; technical activities ; the FORUM endtoend performance simulatoractivity under the responsibility of the Future Missions ; Instruments Division Specialthanks go to the industrial teams who have supported ESA to bring this report together in avery short time after the Phase A Preliminary Requirements Review

his report forms the basis for the selection of the ninth Earth Explorer mission within ESA's Earth Observation Programme. Two competing 'Fast Track' candidates, the Far-infrared Outgoing Radiation Understanding and Monitoring (FORUM) mission and the Surface ocean KInematics Multiscale (SKIM) mission. Each have each undergone a rapid and compressed Phase A feasibility study. This report covers the FORUM mission.

EE9 FORUM
CNR IRIS