Abstract
Detection of nitric acid and nitric oxides in the terrestrial atmosphere in the middle-infrared spectral region
Highlights
The MIRAS grille spectrometer is functionally identical to the grille spectrometer flown in the Spacelab and ATLAS programmes: detailed descriptions can be found in several references (e.g., Muller et al, 1985; Camy-Peyret et al, 1992)
As in the case of MIRAS the choice of the 2.0—16.0 m spectral range is motivated by the presence of numerous strong bands of vibrationalrotational quantum transitions, characteristic of the mentioned gases which enables their detection and determination of their concentration in the atmosphere
The density profiles of the following trace gases will be measured from the lower stratosphere up to the lower thermosphere: O, HO, CO, CO, NO, NO, CH, CNFTOCh, elHM.F,IRHACSl, HNO, NO, OCS, HCN and maybe cyclogram is divided into polar (470°), tropical, sub-tropical and mid-latitude campaigns and covers one calendar year; since MIRAS has predecessors flown in 1983 and 1992, long-term trends in the concentration changes will be addressed
Summary
With the eruption of the Mt. Pinatubo volcano in summer 1991, the role of aerosols in the partitioning of nitrogen species through heterogeneous chemistry and the consequent impact on the ozone distribution through reactions with the halogen species has become evident (Solomon et al, 1996); the corresponding umn and of its rdeisupronnaslevianritahtieoenvoovluetriothneolfastht edeNcaOde colhas been recognised in various observations (Van Roozendael et al, 1996, and references therein). Pinatubo volcano in summer 1991, the role of aerosols in the partitioning of nitrogen species through heterogeneous chemistry and the consequent impact on the ozone distribution through reactions with the halogen species has become evident (Solomon et al, 1996); the corresponding umn and of its rdeisupronnaslevianritahtieoenvoovluetriothneolfastht edeNcaOde colhas been recognised in various observations (Van Roozendael et al, 1996, and references therein) Such a perturbed chemistry plays a major role in the observed ozone losses in the polar winter and spring through heterogeneous processes on polar stratospheric clouds (PSC) at low temperatures, occasionally leading to denitrification (WMO, 1995a). It is of great interest to include the nitrogen species in the correlative measurements proposed here, which in particular contribute to budget studies and vertical profile information simultaneously, with a good spatial and temporal coverage, and which include a new ground-based site
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