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Proceedings Paper

Far-infrared spectrally resolved broadband emission of the atmosphere from Morello and Gomito mountains near Florence
Author(s): Giovanni Bianchini; Luca Palchetti; Alessio Baglioni; Francesco Castagnoli
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Paper Abstract

The spectrally-resolved characterization of the atmospheric emission has a fundamental role in the study of the Earth radiation balance, and only a measurement performed in a wide spectral range enables us to separate the contributions to the radiative balance due to the different altitudes, constituents and physical phases. The REFIR-PAD (Radiation Explorer in the Far InfraRed-Prototype for Application and Development) Fourier transform spectroradiometer can perform a characterization of the broadband radiative signature of clouds and aerosols, with the only limitation of the need of low levels of water vapour like those that are obtainable in high altitude stations during winter. The capabilities of this kind of measurement have been assessed in a series of test campaign performed in Tuscany during the winter of 2006/2007 when atmospheric emission spectra have been acquired in various transparency conditions and the evidence of transparency in the far-infrared region below 600 cm-1 has been demonstrated. REFIR-PAD operates in the spectral range extending from 100 to 1400 cm-1 with a resolution of 0.5 cm-1, using room-temperature detectors and optics and a compact, misalignment-compensated design. The instrument, developed at IFAC-CNR, Florence, has been successfully deployed in several campaigns, both in the ground based zenith-looking geometry and in the nadir-looking balloon borne configuration. The operating spectral range of the REFIR-PAD spectroradiometer encompasses great part of the atmospheric emission spectrum, from the relatively unexplored far-infrared region below 400 cm-1, dominated by water vapour rotational band, to the atmospheric transparency window, where a number of atmospheric instruments are already operating and can provide intercomparison data.

Paper Details

Date Published: 30 October 2007
PDF: 12 pages
Proc. SPIE 6745, Remote Sensing of Clouds and the Atmosphere XII, 67451J (30 October 2007); doi: 10.1117/12.740571
Show Author Affiliations
Giovanni Bianchini, Istituto di Fisica Applicata Nello Carrara (Italy)
Luca Palchetti, Istituto di Fisica Applicata Nello Carrara (Italy)
Alessio Baglioni, Istituto di Fisica Applicata Nello Carrara (Italy)
Francesco Castagnoli, Istituto di Fisica Applicata Nello Carrara (Italy)


Published in SPIE Proceedings Vol. 6745:
Remote Sensing of Clouds and the Atmosphere XII
Adolfo Comerón; Richard H. Picard; Klaus Schäfer; James R. Slusser; Aldo Amodeo, Editor(s)

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