The sky emission between 15 and 26 μ has been measured at the Jungfraujoch (alt. 3570 m) using grating spectrometer with high resolution. Absorption coefficients have been determined for window regions between water vapor rotational lines. The emissivity of cirrus clouds could be estimated from assumed cloud temperatures and measured cloud emission.
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k*λ is the absorption coefficient for Jungfraujoch determined without any correction (ground pressure ~665 mb). kλ,r is the reduced absorption coefficient determined with pressure correction p/1000 mb on water vapor mass. kλ,P is the absorption coefficients derived from spectra of Palmer12; water vapor pressurized with nitrogen, 0.074 resp. 0.143 cm H2O in optical path. The pressure of 550 mb corresponds to an atmospheric level of about 1600 m above Jungfraujoeh. kλ.TY is the absorption coefficient determined from one transmission spectrum of Taylor and Yates.17
Table IV
Meteorological Parameters for the Spectra of Fig. 6
k*λ is the absorption coefficient for Jungfraujoch determined without any correction (ground pressure ~665 mb). kλ,r is the reduced absorption coefficient determined with pressure correction p/1000 mb on water vapor mass. kλ,P is the absorption coefficients derived from spectra of Palmer12; water vapor pressurized with nitrogen, 0.074 resp. 0.143 cm H2O in optical path. The pressure of 550 mb corresponds to an atmospheric level of about 1600 m above Jungfraujoeh. kλ.TY is the absorption coefficient determined from one transmission spectrum of Taylor and Yates.17
Table IV
Meteorological Parameters for the Spectra of Fig. 6