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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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doi:10.5194/amt-2016-422
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
01 Feb 2017
Review status
A revision of this discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
MIPAS IMK/IAA Carbon Tetrachloride (CCl4) Retrieval
Ellen Eckert1, Thomas von Clarmann1, Alexandra Laeng1, Gabriele P. Stiller1, Bernd Funke1, Norbert Glatthor1, Udo Grabowski1, Sylvia Kellmann1, Michael Kiefer1, Andrea Linden1, Gerald Wetzel1, Christopher Boone2, Andreas Engel3, Jeremy J. Harrison4,5,6, Patrick E. Sheese7, Kaley A. Walker2,7, and Peter F. Bernath2,8 1Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Karlsruhe, Germany
2Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada
3Institut für Atmosphäre und Umwelt, J. W. Goethe Universität, Frankfurt, German
4Department of Physics, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
5National Centre for Earth Observation, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
6Leicester Institute for Space and Earth Observation, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
7Department of Physics, University of Toronto, Toronto, Ontario, Canada
8Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529-0126, USA
Abstract. MIPAS thermal limb emission measurements were used to derive vertically resolved profiles of carbon tetrachloride (CCl4). Level-1b data versions MIPAS/5.02 to MIPAS/5.06 were converted into profiles using the level-2 processor developed at Karlsruhe Institute of Technology (KIT) Institute of Meteorology and Climate Research (IMK) and Consejo Superior de Investigaciones Científicas (CSIC), Instituto de Astrofísica de Andalucía (IAA). Consideration of peroxyacetyl nitrate (PAN) as interfering species, which is jointly retrieved and CO2 line mixing, was found to be crucial for reliable retrievals. Parts of the CO2 Q-branch region that overlap with the CCl4 signature were omitted, since large residuals were still found even though line mixing was considered in the forward model. However, the omitted spectral region could be narrowed considerably when line mixing was a44 volume mixing ratios. In general, latitude-altitude cross-section show the expected CCl4 features with highest values of around 90 pptv at altitudes at and below the tropical tropopause and values decreasing with altitude and latitude due to stratospheric decomposition. Other patterns, such as subsidence in the polar vortex during winter and early spring, are also visible in the distributions. The decline in CCl4 abundance during the MIPAS Envisat measurement period (July 2002 to April 2012) is clearly reflected in the retrieved distributions.

Citation: Eckert, E., von Clarmann, T., Laeng, A., Stiller, G. P., Funke, B., Glatthor, N., Grabowski, U., Kellmann, S., Kiefer, M., Linden, A., Wetzel, G., Boone, C., Engel, A., Harrison, J. J., Sheese, P. E., Walker, K. A., and Bernath, P. F.: MIPAS IMK/IAA Carbon Tetrachloride (CCl4) Retrieval, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-422, in review, 2017.
Ellen Eckert et al.
Ellen Eckert et al.
Ellen Eckert et al.

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Short summary
We retrieved vertical profiles of CCl4 from MIPAS Envisat IMK/IAA data. A detailed description of all characteristics is included in the paper as well as comparisons with historical measurements and comparisons with collocated measurements of instruments covering the same time span as MIPAS Envisat. A particular focus also lies on the introduction of a new CCl4 spectroscopic dataset introduced recently, which leads to more realistic CCl4 volume mixing ratios.
We retrieved vertical profiles of CCl4 from MIPAS Envisat IMK/IAA data. A detailed description...
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