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Stratospheric Lifetime Ratio of Cfc-11 and Cfc-12 from Satellite and Model Climatologies : Volume 14, Issue 11 (25/06/2014)

By Hoffmann, L.

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Book Id: WPLBN0003996969
Format Type: PDF Article :
File Size: Pages 42
Reproduction Date: 2015

Title: Stratospheric Lifetime Ratio of Cfc-11 and Cfc-12 from Satellite and Model Climatologies : Volume 14, Issue 11 (25/06/2014)  
Author: Hoffmann, L.
Volume: Vol. 14, Issue 11
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Hoppe, C. M., Dutton, G. S., Jones, A., Volk, C. M., Müller, R., Gille, J. C.,...Griessbach, S. (2014). Stratospheric Lifetime Ratio of Cfc-11 and Cfc-12 from Satellite and Model Climatologies : Volume 14, Issue 11 (25/06/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Jülich Supercomputing Centre, Forschungszentrum Jülich, Jülich, Germany. 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 global 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 yr 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 111(96–132) yr for ACE-FTS, a ratio of 0.46±0.07 and a lifetime of 112(97–133) yr for HIRDLS, and a ratio of 0.46±0.08 and a lifetime of 112(96–135) yr for MIPAS. The error-weighted, combined CFC-11/CFC-12 lifetime ratio is 0.47±0.04 and the CFC-12 lifetime estimate is 112(102–123) yr. These results agree with the recent Stratosphere-troposphere Processes And their Role in Climate (SPARC) reassessment, which recommends lifetimes of 52(43–67) yr and 102(88–122) yr, 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) yr, based on a ten-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.

Summary
Stratospheric lifetime ratio of CFC-11 and CFC-12 from satellite and model climatologies

Excerpt
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