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

Journal metrics

Journal metrics

  • IF value: 3.248 IF 3.248
  • IF 5-year value: 3.650 IF 5-year 3.650
  • CiteScore value: 3.37 CiteScore 3.37
  • SNIP value: 1.253 SNIP 1.253
  • SJR value: 1.869 SJR 1.869
  • IPP value: 3.29 IPP 3.29
  • h5-index value: 47 h5-index 47
  • Scimago H index value: 60 Scimago H index 60
Volume 9, issue 7 | Copyright
Atmos. Meas. Tech., 9, 3355-3389, 2016
https://doi.org/10.5194/amt-9-3355-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 28 Jul 2016

Research article | 28 Jul 2016

MIPAS IMK/IAA CFC-11 (CCl3F) and CFC-12 (CCl2F2) measurements: accuracy, precision and long-term stability

E. Eckert1, A. Laeng1, S. Lossow1, S. Kellmann1, G. Stiller1, T. von Clarmann1, N. Glatthor1, M. Höpfner1, M. Kiefer1, H. Oelhaf1, J. Orphal1, B. Funke2, U. Grabowski1, F. Haenel1, A. Linden1, G. Wetzel1, W. Woiwode1, P. F. Bernath3, C. Boone4, G. S. Dutton5,6, J. W. Elkins5, A. Engel7, J. C. Gille8,9, F. Kolonjari10, T. Sugita11, G. C. Toon12, and K. A. Walker4,10 E. Eckert et al.
  • 1Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Karlsruhe, Germany
  • 2Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain
  • 3Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529-0126, USA
  • 4Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada
  • 5NOAA Earth System Research Laboratory, Boulder, CO 80305, USA
  • 6Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, USA
  • 7Institut für Atmosphäre und Umwelt, J. W. Goethe Universität, Frankfurt, Germany
  • 8National Center for Atmospheric Research, Boulder, Colorado, USA
  • 9Center for Limb Atmospheric Sounding, University of Colorado, Boulder, Colorado, USA
  • 10Department of Physics, University of Toronto, Toronto, Ontario, Canada
  • 11National Institute for Environmental Studies, Tsukuba, Japan
  • 12Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA

Abstract. Profiles of CFC-11 (CCl3F) and CFC-12 (CCl2F2) of the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) aboard the European satellite Envisat have been retrieved from versions MIPAS/4.61 to MIPAS/4.62 and MIPAS/5.02 to MIPAS/5.06 level-1b data using the scientific level-2 processor run by 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). These profiles have been compared to measurements taken by the balloon-borne cryosampler, Mark IV (MkIV) and MIPAS-Balloon (MIPAS-B), the airborne MIPAS-STRatospheric aircraft (MIPAS-STR), the satellite-borne Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) and the High Resolution Dynamic Limb Sounder (HIRDLS), as well as the ground-based Halocarbon and other Atmospheric Trace Species (HATS) network for the reduced spectral resolution period (RR: January 2005–April 2012) of MIPAS. ACE-FTS, MkIV and HATS also provide measurements during the high spectral resolution period (full resolution, FR: July 2002–March 2004) and were used to validate MIPAS CFC-11 and CFC-12 products during that time, as well as profiles from the Improved Limb Atmospheric Spectrometer, ILAS-II. In general, we find that MIPAS shows slightly higher values for CFC-11 at the lower end of the profiles (below  ∼ 15km) and in a comparison of HATS ground-based data and MIPAS measurements at 3km below the tropopause. Differences range from approximately 10 to 50pptv ( ∼ 5–20%) during the RR period. In general, differences are slightly smaller for the FR period. An indication of a slight high bias at the lower end of the profile exists for CFC-12 as well, but this bias is far less pronounced than for CFC-11 and is not as obvious in the relative differences between MIPAS and any of the comparison instruments. Differences at the lower end of the profile (below  ∼ 15km) and in the comparison of HATS and MIPAS measurements taken at 3km below the tropopause mainly stay within 10–50pptv (corresponding to  ∼ 2–10% for CFC-12) for the RR and the FR period. Between  ∼ 15 and 30km, most comparisons agree within 10–20pptv (10–20%), apart from ILAS-II, which shows large differences above  ∼ 17km. Overall, relative differences are usually smaller for CFC-12 than for CFC-11. For both species – CFC-11 and CFC-12 – we find that differences at the lower end of the profile tend to be larger at higher latitudes than in tropical and subtropical regions. In addition, MIPAS profiles have a maximum in their mixing ratio around the tropopause, which is most obvious in tropical mean profiles. Comparisons of the standard deviation in a quiescent atmosphere (polar summer) show that only the CFC-12 FR error budget can fully explain the observed variability, while for the other products (CFC-11 FR and RR and CFC-12 RR) only two-thirds to three-quarters can be explained. Investigations regarding the temporal stability show very small negative drifts in MIPAS CFC-11 measurements. These instrument drifts vary between  ∼ 1 and 3%decade−1. For CFC-12, the drifts are also negative and close to zero up to  ∼ 30km. Above that altitude, larger drifts of up to  ∼ 50%decade−1 appear which are negative up to  ∼ 35km and positive, but of a similar magnitude, above.

Publications Copernicus
Download
Short summary
We investigate the accuracy, precision and long-term stability of the MIPAS Envisat IMK/IAA CFC-11 (CCl3F) and CFC-12 (CCl2F2) products. For comparisons we use several data products from satellite, airplane and balloon-borne instruments as well as ground-based data. MIPAS Envisat CFC-11 has a slight high bias at the lower end of the profile. CFC-12 agrees well with other data products. The temporal stability is good up to ~ 30 km, but still leaves room for improvement.
We investigate the accuracy, precision and long-term stability of the MIPAS Envisat IMK/IAA...
Citation
Share