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| Titel |
Global stratospheric fluorine inventory for 2004-2009 from Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) measurements and SLIMCAT model simulations |
| VerfasserIn |
A. T. Brown, M. P. Chipperfield, N. A. D. Richards, C. Boone, 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 ; 14, no. 1 ; Nr. 14, no. 1 (2014-01-09), S.267-282 |
| Datensatznummer |
250118257
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| Publikation (Nr.) |
 copernicus.org/acp-14-267-2014.pdf |
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| Zusammenfassung |
| Fluorine-containing species can be extremely effective atmospheric
greenhouse gases. We present fluorine budgets using organic and inorganic
species retrieved by the ACE-FTS satellite instrument supplemented with
output from the SLIMCAT 3-D chemical transport model. The budgets are
calculated between 2004 and 2009 for a number of latitude bands:
70–30° N, 30–00° N,
00° N–30° S, and 30–70° S. At
lower altitudes total fluorine profiles are dominated by the contribution
from CFC-12, up to an altitude of 20 km in the extra-tropics and 29 km in
the tropics; above these altitudes the profiles are dominated by hydrogen fluoride (HF). Our
data show that total fluorine profiles at all locations have a negative
slope with altitude, providing evidence that overall fluorine emissions
(measured by their F content) have been increasing with time. Total
stratospheric fluorine is increasing at a similar rate in the tropics:
32.5 ± 4.9 ppt yr−1 (1.31 ± 0.20% per year) in the Northern
Hemisphere (NH) and 29.8 ± 5.3 ppt yr−1 (1.21 ± 0.22% per
year) in the Southern Hemisphere (SH). Extra-tropical total stratospheric
fluorine is also increasing at a similar rate in both the NH and SH: 28.3 ± 2.7 ppt per year (1.12 ± 0.11% per year) in the NH and
24.3 ± 3.1 ppt per year (0.96 ± 0.12% per year) in the SH.
The calculation of radiative efficiency-weighted total fluorine allows the
changes in radiative forcing between 2004 and 2009 to be calculated. These
results show an increase in radiative forcing of between 0.23 ± 0.11% per year and 0.45 ± 0.11% per year, due to the increase in
fluorine-containing species during this time. The decreasing trends in the
mixing ratios of halons and chlorofluorocarbons (CFCs), due to their prohibition under the
Montreal Protocol, have suppressed an increase in total fluorine caused by
increasing mixing ratios of hydrofluorocarbons (HFCs). This has reduced the impact of fluorine-containing species on global warming. |
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