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| Titel |
Impact on ozone of high-speed stratospheric aircraft: effects of the emission scenario |
| VerfasserIn |
G. Pitari, S. Palermi, G. Visconti |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 12, no. 10/11 ; Nr. 12, no. 10/11, S.996-1005 |
| Datensatznummer |
250010337
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| Publikation (Nr.) |
 copernicus.org/angeo-12-996-1994.pdf |
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| Zusammenfassung |
| A photochemical-transport two-dimensional
model has been used to assess the impact of a projected fleet of high-speed
stratospheric aircraft using different emissions scenarios. It is shown that the
presence in the background atmosphere of nitric acid trihydrate aerosols is
responsible for a lower stratospheric denoxification in addition to that caused
by the sulfate aerosol layer. This has the effect of further decreasing the
relative role of the odd nitrogen catalytic cycle for ozone destruction, so that
the lower stratosphere is primarily controlled by chlorine species. The effect
of aircraft injection of nitric oxides is that of decreasing the level of ClO,
so that the lower stratospheric ozone (below about 20-25 km altitude) increases.
The net effect on global ozone is that of a small increase even at Mach 2.4, and
is enhanced by adopting emission scenarios including altitude restriction at 15
or 18 km. Reductions of the emission index (EI) of nitric oxides below
relatively small values (about 15) are shown to reduce the aircraft-induced
ozone increase, because of the associated smaller decrease of ClO. This
conclusion is no more valid when the emission index is raised at the present
values (about 45). |
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