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Implication for stratospheric composition of a reduced absorption cross section in the Herzberg continuum of molecular oxygen
Author(s) -
Brasseur G.,
De Rudder A.,
Simon P. C.
Publication year - 1983
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl010i001p00020
Subject(s) - absorption cross section , molecular absorption , absorption (acoustics) , wavelength , atmospheric sciences , irradiance , atmospheric composition , absorption spectroscopy , oxygen , in situ , optics , environmental science , cross section (physics) , materials science , physics , atomic physics , atmosphere (unit) , spectral line , meteorology , astronomy , quantum mechanics
Recent determinations of O 2 absorption cross sections in the Herzberg continuum, obtained from in situ solar irradiance measurements, have shown that the corresponding laboratory values might be overestimated by 30 to 50 percent. The change in the stratospheric composition due to such a reduction in these cross sections has been calculated by means of a steady state one dimensional chemical model. An accurate determination of the O 2 absorption spectrum in the 200‐220 nm range is required since the distribution of several trace species is very sensitive to the atmospheric transmissivity in this wavelength region.