The Far-Infrared Radiation Mobile Observation System (FIRMOS) for spectral characterisation of the atmospheric emission

Year: 2023

Authors: Claudio Belotti; Flavio Barbara; Marco Barucci; Giovanni Bianchini; Francesco D’Amato; Samuele Del Bianco; Gianluca Di Natale; Marco Gai; Alessio Montori; Filippo Pratesi; Markus Rettinger; Christian Rolf; Ralf Sussmann; Thomas Trickl; Silvia Viciani; Hannes Vogelman; Luca Palchetti

Autors Affiliation: CNR, Natl Inst Opt, Florence, Italy; CNR, Inst Appl Phys Nello Carrara, Florence, Italy; Karlsruhe Inst Technol KIT, IMK IFU, Garmisch Partenkirchen, Germany; Forschungszentrum Julich, IEK 7 Julich, Julich, Germany.

Abstract: The Far-Infrared Radiation Mobile Observation System (FIRMOS) is a Fourier transform spectroradiometer developed to support the Far-infrared Outgoing Radiation Understanding and Monitoring (FORUM) satellite mission by validating measurement methods and instrument design concepts, both in the laboratory and in field campaigns. FIRMOS is capable of measuring the downwelling spectral radiance emitted by the atmosphere in the spectral band from 100 to 1000 cm-1 (10-100 ?m in wavelength), with a maximum spectral resolution of 0.25 cm-1. We describe the instrument design and its characterisation and discuss the geophysical products obtained by inverting the atmospheric spectral radiance measured during a campaign from the high-altitude location of Mount Zugspitze in Germany, beside the Extended-range Atmospheric Emitted Radiance Interferometer (E-AERI), which is permanently installed at the site. Following the selection of clear-sky scenes, using a specific algorithm, the water vapour and temperature profiles were retrieved from the FIRMOS spectra by applying the Kyoto protocol and Informed Management of the Adaptation (KLIMA) code. The profiles were found in very good agreement with those provided by radiosondes and by the Raman lidar operating from the Zugspitze Schneefernerhaus station. In addition, the retrieval products were validated by comparing the retrieved Integrated Water Vapour values with those obtained from the E-AERI spectra.

Journal/Review: ATMOSPHERIC MEASUREMENT TECHNIQUES

Volume: 16 (10)      Pages from: 2511  to: 2529

More Information: This research has been supported by the European Space Agency (FIRMOS Project; contract no. 4000123691/18/NL/LF) and the Agenzia Spaziale Ital-iana (FORUM scienza project; grant no. 2019-20-HH.0). The dedicated balloon activities were partly funded by Helmholtz- Gemeinschaft (MOSES – Modular Observation Solutions for Earth Systems).
KeyWords: FORUM, FIRMOS, Zugspitze campaign; WATER-VAPOR; LIDAR; RETRIEVAL INTERFEROMETER; TEMPERATURE; TROPOSPHERE; ABSORPTION; SOUNDINGS; RADIANCE
DOI: 10.5194/amt-16-2511-2023

Citations: 4
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