Validation of SAGE II NO2 measurements
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Stratospheric aerosol and gas experiment (SAGE) II satellite-borne measurements of the stratospheric profiles of NO2 at sunset have been made since October 1984. The measurements are made by solar occultation and are derived from the difference between the absorptions in narrow bandwidth channels centered at 0.448 and 0.453 μm. The precision of the profiles is approximately 5% between an upper altitude of 36 km and a latitude-dependent lower altitude at which the mixing ratio is 4 ppbv (for example, approximately 25 km at mid-latitudes and 29 km in the tropics). At lower altitudes the precision is approximately 0.2 ppbv. Comparisons against two sets of balloon profiles and atmospheric trace molecules spectroscopy experiment (ATMOS) measurements show agreement within approximately 10% over the altitude range of 23 to 37 km at mid-latitudes.
CitationCunnold, D.M.; Zawodny, J.M.; Chu, W.P.; Pommereau, J.P.; Goutail, F.; Lenoble, J.; McCormick, M.P.; Veiga, R.E.; Murcray, D.; Iwagami, N.; Shibasaki, K.; Simon, P.C.; Peetermans, W. (1991). Validation of SAGE II NO2 measurements. , Journal of Geophysical Research, Vol. 96, Issue D7, 12913-12925, DOI: 10.1029/91JD01344.