 |
| Titel |
Stratospheric lifetime ratio of CFC-11 and CFC-12 from satellite and model climatologies |
| VerfasserIn |
L. Hoffmann, C. M. Hoppe, R. Müller, G. S. Dutton, J. C. Gille, S. Griessbach, A. Jones, C. I. Meyer, R. Spang, C. M. Volk, K. A. Walker |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 22 ; Nr. 14, no. 22 (2014-11-27), S.12479-12497 |
| Datensatznummer |
250119192
|
| Publikation (Nr.) |
 copernicus.org/acp-14-12479-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Chlorofluorocarbons (CFCs) play a key role in stratospheric ozone
loss and are strong infrared absorbers that contribute to global
warming. The stratospheric lifetimes of CFCs are a measure of their
stratospheric loss rates that are needed to determine global warming
and ozone depletion potentials. We applied the tracer–tracer
correlation approach to zonal mean climatologies from satellite
measurements and model data to assess the lifetimes of CFCl3
(CFC-11) and CF2Cl2 (CFC-12). We present estimates of the
CFC-11/CFC-12 lifetime ratio and the absolute lifetime of CFC-12,
based on a reference lifetime of 52 years for CFC-11. We analyzed
climatologies from three satellite missions, the Atmospheric
Chemistry Experiment-Fourier Transform Spectrometer (ACE-FTS), the
HIgh Resolution Dynamics Limb Sounder (HIRDLS), and the Michelson
Interferometer for Passive Atmospheric Sounding (MIPAS). We found a
CFC-11/CFC-12 lifetime ratio of 0.47±0.08 and a CFC-12 lifetime
of 112(96–133) years for ACE-FTS, a ratio of 0.46±0.07 and a
lifetime of 113(97–134) years for HIRDLS, and a ratio of
0.46±0.08 and a lifetime of 114(98–136) years for MIPAS. The
error-weighted, combined CFC-11/CFC-12 lifetime ratio is
0.46±0.04 and the CFC-12 lifetime estimate is
113(103–124) years. These results agree with the recent
Stratosphere-troposphere Processes And their Role in Climate (SPARC)
reassessment, which recommends lifetimes of 52(43–67) years and
102(88–122) years, respectively. Having smaller uncertainties than
the results from other recent studies, our estimates can help to
better constrain CFC-11 and CFC-12 lifetime recommendations in
future scientific studies and assessments. Furthermore, the
satellite observations were used to validate first simulation
results from a new coupled model system, which integrates a
Lagrangian chemistry transport model into a climate model. For the
coupled model we found a CFC-11/CFC-12 lifetime ratio of
0.48±0.07 and a CFC-12 lifetime of 110(95–129) years, based on a
10-year perpetual run. Closely reproducing the satellite
observations, the new model system will likely become a useful tool
to assess the impact of advective transport, mixing, and
photochemistry as well as climatological variability on the
stratospheric lifetimes of long-lived tracers. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|