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Volume 9, issue 11 | Copyright

Special issue: Twenty-five years of operations of the Network for the Detection...

Atmos. Meas. Tech., 9, 5621-5636, 2016
https://doi.org/10.5194/amt-9-5621-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 25 Nov 2016

Research article | 25 Nov 2016

CFC-11, CFC-12 and HCFC-22 ground-based remote sensing FTIR measurements at Réunion Island and comparisons with MIPAS/ENVISAT data

Minqiang Zhou1,2,3, Corinne Vigouroux2, Bavo Langerock2, Pucai Wang1, Geoff Dutton4, Christian Hermans2, Nicolas Kumps2, Jean-Marc Metzger5, Geoff Toon6, and Martine De Mazière2 Minqiang Zhou et al.
  • 1Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 2Royal Belgian Institute for Space Aeronomy, Brussels, Belgium
  • 3University of Chinese Academy of Sciences, Beijing, China
  • 4Earth System Research Laboratory, NOAA, Boulder, Colorado, USA
  • 5UMS 3365 – OSU Réunion, Université de La Réunion, Saint-Denis, Réunion, France
  • 6Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA

Abstract. Profiles of CFC-11 (CCl3F), CFC-12 (CCl2F2) and HCFC-22 (CHF2Cl) have been obtained from Fourier transform infrared (FTIR) solar absorption measurements above the Saint-Denis (St Denis) and Maïdo sites at Réunion Island (21°S, 55°E) with low vertical resolution. FTIR profile retrievals are performed by the well-established SFIT4 program and the detail retrieval strategies along with the systematic/random uncertainties of CFC-11, CFC-12 and HCFC-22 are discussed in this study. The FTIR data of all three species are sensitive to the whole troposphere and the lowermost stratosphere, with the peak sensitivity between 5 and 10km.

The ground-based FTIR data have been compared with the collocated Michelson Interferometer for Passive Atmospheric Sounding (MIPAS/ENVISAT) data and found to be in good agreement: the observed mean relative biases and standard deviations of the differences between the smoothed MIPAS and FTIR partial columns (6–30km) are (−4.3 and 4.4%), (−2.9 and 4.6%) and (−0.7 and 4.8%) for CFC-11, CFC-12 and HCFC-22, respectively, which are within the combined error budgets from both measurements. The season cycles of CFC-11, CFC-12 and HCFC-22 from FTIR measurements and MIPAS data show a similar variation: concentration is highest in February–April and lowest in August–October.

The trends derived from the combined St Denis and Maïdo FTIR time series are −0.86±0.12 and 2.84±0.06% year−1 for CFC-11 and HCFC-22, respectively, for the period 2004 to 2016, and −0.76±0.05% year−1 for CFC-12 for 2009 to 2016. These measurements are consistent with the trends observed by the National Oceanic and Atmospheric Administration (NOAA) Global Monitoring Division's (GMD) Halocarbons & other Atmospheric Trace Species Group (HATS) measurements at Samoa (14.2°S, 170.5°W) for CFC-11 (−0.87±0.04% year−1), but slightly weaker for HCFC-22 (3.46±0.05%) year−1 and stronger for CFC-12 (−0.60±0.02% year−1).

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Profiles of CFC-11, CFC-12 and HCFC-22 have been obtained from FTIR measurements above the Saint-Denis and Maïdo sites at Reunion Island (21° S, 55° E) with low vertical resolution. The trends derived from the FTIR measurements are −0.86 ± 0.12 % and 2.84 ± 0.06 % for CFC-11 and HCFC-22, respectively, for the period 2004 to 2016, and −0.76 ± 0.05 % for CFC-12 for 2009 to 2016, which are consistent with ground-based in situ observations. Our FTIR data and the collocated MIPAS data are in good agreement.
Profiles of CFC-11, CFC-12 and HCFC-22 have been obtained from FTIR measurements above the...
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