Retrieval of foreign-broadened water vapor continuum coefficients from emitted spectral radiance in the H2O rotational band from 240 to 590 cm

Year: 2008

Authors: Serio C., Masiello G., Esposito F., Di Girolamo P., Di Iorio T., Palchetti L., Bianchini G., Muscari G., Pavese G., Rizzi R., Carli B., Cuomo V.

Autors Affiliation: Dip. Ingegeneria e Fisica dell\’Ambiente, Universitá della Basilicata, Potenza, Italy; Dip. Fisica, Universitá di Roma La Sapienza, Roma, Italy; Istituto di Fisica Applicata Nello Carrara, IFAC-CNR, Firenze, Italy; Istituto di Metodologie, per l\’Analisi Ambientale, IMAA-CNR, Potenza, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy; Dip. Fisica, Universitá di Bologna, Bologna, Italy

Abstract: The paper presents a novel methodology to retrieve the foreign-broadened water vapor continuum absorption coefficients in the spectral range 240 to 590 cm-1 and is the first estimation of the continuum coefficient at wave numbers smaller than 400 cm-1 under atmospheric conditions. The derivation has been accomplished by processing a suitable set of atmospheric emitted spectral radiance observations obtained during the March 2007 Alps campaign of the ECOWAR project (Earth COoling by WAter vapor Radiation). It is shown that, in the range 450 to 600 cm-1, our findings are in good agreement with the widely used Mlawer, Tobin-Clough, Kneizys-Davies (MT_CKD) continuum. Below 450 cm-1 however the MT.CKD model overestimates the magnitude of the continuum coefficient.

Journal/Review: OPTICS EXPRESS

Volume: 16 (20)      Pages from: 15816  to: 15833

More Information: Work supported by MIUR PRIN 2005, project # 2005025202/Area 02. We thank the Istituto di Fisica dello Spazio Interplanetario, the Centro Nazionale di Meteorologia e Climatologia Aeronautica, and the town of Valtournenche.
KeyWords: Water absorption, Absorption co-efficient; Atmospheric conditions; Earth cooling; Novel methodology; Rotational band; Spectral radiance; Spectral range; Water vapor continuums, Water vapor, water, algorithm; article; atmosphere; chemistry; Fourier analysis; gas; infrared spectrophotometry; methodology; optics; statistical model; temperature; theoretical model, Algorithms; Atmosphere; Fourier Analysis; Gases; Models, Statistical; Models, Theoretical; Optics; Spectrophotometry, Infrared; Temperature; Water
DOI: 10.1364/OE.16.015816

Citations: 39
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