The atmospheric absorption spectra in the 0,88-1,03mm range were studied by means of an intracavity F2+: LiF-laser spectrometer with a minimum detectable absorption coefficient of 8Ч10-8 cm-1 and a spectral resolution of 0,05 cm-1. Water vapor was found to be the major atmospheric absorber in the spectral region of interest where ~300 absorption lines of H2O were observed.