# MODEL FOR LINE-MIXING EFFECTS IN THE INFRARED $\nu_{3}$ BAND OF $CH_{4}$. APPLICATION TO ATMOSPHERIC SPECTRA

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 Title: MODEL FOR LINE-MIXING EFFECTS IN THE INFRARED $\nu_{3}$ BAND OF $CH_{4}$. APPLICATION TO ATMOSPHERIC SPECTRA Creators: Pieroni, D.; Nguyen-Van-Thanh; Brodbeck, C.; Valentin, A.; Claveau, C.; Camy-Peyret, C.; Hartmann, J.- M.; Gabard, T.; Champion, J. P. Issue Date: 1998 Publisher: Ohio State University Abstract: Recent studies, using laboratory and atmospheric spectra, have demonstrated the influence of line-mixing effects on $CH_{4}$ infrared absorption. This phenomenon can significantly affect remote sensing results for atmospheric applications and the contribution of $CH_{4}$ to the green house effect. We propose a model of the relaxation operator in order to account for these effects in the computations of the absorption. The model was built using a semi-classical calculation of collisional energy transfer $rates^{a}$ and few empirical parameters. Results obtained for $N_{2}$-broadened spectra of the $\nu_{3}$ band of $CH_{4}$ (near $3 \mu$m) including laboratory measurements covering different pressure and temperature ranges, and atmospheric spectra will be presented. Description: $^{a}$ T. Gabard, J. Quant, Spectrosc. Radiat. Transfer Vol. 57, no. 2, pp. 177-196, 1997. Author Institution: Laboratoire De Physique Mol\'{E}Culaire Et Applications, B\^{a}t 350., Universit\'{e} Paris-Sud; Laboratoire de Physique de l'Universit\'{e} de Bourgogne, Unit\'{e} associ\'{e}e au CNRS URI: http://hdl.handle.net/1811/19141 Other Identifiers: 1998-WF-09