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| Titel |
Stratospheric loss and atmospheric lifetimes of CFC-11 and CFC-12 derived from satellite observations |
| VerfasserIn |
K. Minschwaner, L. Hoffmann, A. Brown, M. Riese, R. Müller, P. F. Bernath |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 8 ; Nr. 13, no. 8 (2013-04-24), S.4253-4263 |
| Datensatznummer |
250018605
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| Publikation (Nr.) |
 copernicus.org/acp-13-4253-2013.pdf |
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| Zusammenfassung |
| The lifetimes of CFC-11 and CFC-12 have been evaluated using global
observations of their stratospheric distributions from satellite-based
instruments over the time period from 1992 to 2010. The chlorofluorocarbon (CFC) datasets are
from the Cryogen Limb Array Etalon Spectrometer (CLAES), the Cryogenic
Infrared Spectrometers and Telescopes for the Atmosphere (CRISTA-1 and
CRISTA-2), the Michelson Interferometer for Passive Atmospheric Sounding
(MIPAS), and the Atmospheric Chemistry Experiment (ACE). Stratospheric loss
rates were calculated using an ultraviolet radiative transfer code with
updated cross section and solar irradiance data. Mean steady-state lifetimes
based on these observations are 44.7 (36–58) yr for CFC-11 and 106.6
(90–130) yr for CFC-12, which are in good agreement with the most recent WMO
ozone assessment. There are two major sources of error in calculating
lifetimes using this method. The first important error arises from
uncertainties in tropical stratospheric observations, particularly for
CFC-11. Another large contribution to the error is due to uncertainties in
the penetration of solar ultraviolet radiation at wavelengths between 185
and 220 nm, primarily in the tropical stratosphere between 20 and 35 km
altitude. |
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