New spectral features of stratospheric trace gases identified from high-resolution infrared balloon-borne and laboratory spectra

Computer Science – Sound

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Atmospheric Composition, Balloon Sounding, Balloon-Borne Instruments, Infrared Spectra, Stratosphere, Trace Contaminants, Michelson Interferometers, Nitric Acid, Nitrogen Dioxide, Upper Atmosphere

Scientific paper

A new Michelson-type interferometer system operating in the infrared at very high resolution has been used to record numerous balloon-borne solar absorption spectra of the stratosphere, ground-based solar absorption spectra, and laboratory spectra of molecules of atmospheric interest. In the present work results obtained for several important stratospheric trace gases, HNO3, CIONO2, HO2NO2, NO2, and COF2, in the 8- to 12-micron spectral region are reported. Many new features of these gases have been identified in the stratospheric spectra. Comparison of the new spectra with line-by-line simulations shows that previous spectral line parameters are often inadequate and that new analysis of high-resolution laboratory and atmospheric spectra and improved theoretical calculations will be required for many bands. Preliminary versions of several sets of improved line parameters under development are discussed.

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