Schärfe der optischen Obergrenze der Ozonschicht

• Main Author: Stille, Ulrich
• Format: Article in Journal/Newspaper
• Language: German
• Published: Vieweg 1952
• Subjects: Article; ddc:53; Brunsvicensien der Universitätsbibliothek Braunschweig; Abhandlungen der BWG; Tromso
• Online Access: https://doi.org/10.24355/dbbs.084-201212061502-0; https://nbn-resolving.org/urn:nbn:de:gbv:084-12120615023; https://leopard.tu-braunschweig.de/receive/dbbs_mods_00046330; https://leopard.tu-braunschweig.de/servlets/MCRFileNodeServlet/dbbs_derivate_00027083/Stille_Obergrenze_Ozonschicht.pdf; http://www.digibib.tu-bs.de/?docid=00046330

A difference [delta]x of the heights in the atmosphere of the earth is considered as a measure of the 'sharpness' of the optical upper limit of the ozone-layer which strongly absorbs ultraviolet sunlight in the spectral region of the Hartley-band. This difference [delta]x is defined by the condition that an ultraviolet sunbeam, traversing the atmosphere at the height x* with the intensity I0 ([lambda]), by the absorption of the ozone will be weakened to an intensity I([lambda])=lO^-2.I0([lambda]) if the path of the sunbeam through the atmosphere is lowered by the amount of [delta]x. Approximating the real distribution of atmospheric ozone with height by suitable exponential functions, the constants of which are to be taken from the observed distributions, the thickness d of absorption in the ozone-layer is evaluated for different basic heights x0 of the ultraviolet beam. In this way, using different decadic coefficients of absorption, [alpha]([lambda]), of the Hartley-band, one gets the corresponding curves of I([lambda])/I0([lambda]) against the height h aver the ground for the average distributions of atmospheric ozone over Arosa and Tromso. From a detailed discussion of these curves, it follows that the 'sharpness' [delta]x of the optical upper limit of the atmospheric ozone-layer is of the order of 1 to 2 km. The consequences for the decay with time of the intensity of the D-lines of sodium, emitted in the twilight, are mentioned.