Experimental selfand foreign-continuum of water vapor in the 1600 cm-1 absorption band
A.A. Simonova, I.V. Ptashnik
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: continuum absorption, water vapor, foreign-continuum, self-continuum, spectral parameters, Fourier-transform spectroscopy, absorption bans, water dimer, temperature dependence
Abstract
Water vapor is a significant component of the Earth's atmosphere. Assessing the contribution of water vapor to the Earth's radiation balance has remained a topical issue for decades. In this work, the water vapor self- and foreign-continuum spectra have been retrieved at temperatures of 310, 325, and 340 K in the 1600 cm-1 absorption band for the first time based on earlier Fourier-measurements of water vapor absorption under self-broadening and broadening by air at 296-340 K within this absorption band with the use of HITRAN2020 spectroscopic database. The retrieved spectra show characteristic for self- and foreign-continuum spectral and temperature dependences. The spectra we retrieved are compared with the MT_CKD semi-empirical continuum model and the semi-empirical dimer-based continuum model ( Simonova A.A., Ptashnik I.V., Shine K.P. Semi-empirical water dimer model of the water vapour self-continuum within the IR absorption bands // J. Quant. Spectrosc. Radiat. Transfer. 2024. V. 329. P. 109198-1-19. DOI: 10.1016/j.jqsrt.2024.109198). The results are important from both fundamental, within the molecular spectroscopy, and practical point of view, in problems of atmospheric modeling and remote sensing.
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