Water vapour continuum absorption in the near-IR atmospheric windows
I.V. Ptashnik, T.M. Petrova, Yu.N. Ponomarev, A.A. Solodov, A.M. Solodov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: H2O continuum, MT_CKD continuum, atmospheric windows, FTS spectroscopy
Abstract
Measurement of the near-infrared water vapour absorption is made in the spectral region 2000–8000 cm–1 at a temperature of 287 K on the basis of high-resolution Fourier spectrometry. The water vapour continuum absorption spectrum is retrieved using known absorption in 2500 cm–1 region as a reference point. It is shown that in the conditions under investigation the continuum absorption in four windows differ no more than by 20%. This is in contradiction with MT_CKD continuum model that predicts much stronger variability of the continuum in these windows.
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