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

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© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
04 Jul 2013
Review status
A revision of this discussion paper for further review has not been submitted.
Intercomparison of stratospheric ozone profiles for the assessment of the upgraded GROMOS radiometer at Bern
S. Studer1,2, K. Hocke1,2, M. Pastel3, S. Godin-Beekmann3, and N. Kämpfer1,2 1Institute of Applied Physics (IAP), University of Bern, Bern, Switzerland
2Oeschger Center for Climate Change Research (OCCR), University of Bern, Bern, Switzerland
3Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles, Saint-Quentin-en-Yvelines, Guyancourt, France
Abstract. Since November 1994, the GROund-based Millimeter-wave Ozone Spectrometer (GROMOS) measures stratospheric and lower mesospheric ozone in Bern, Switzerland (47.95° N, 7.44° E). GROMOS is part of the Network for the Detection of Atmospheric Composition Change (NDACC). In July 2009, a Fast-Fourier-Transform spectrometer (FFTS) has been added as backend to GROMOS. The new FFTS and the original filter bench (FB) measured parallel for over two years. In October 2011, the FB has been turned off and the FFTS is now used to continue the ozone time series. For a consolidated ozone time series in the frame of NDACC, the quality of the stratospheric ozone profiles obtained with the FFTS has to be assessed. The FFTS results from July 2009 to December 2011 are compared to ozone profiles retrieved by the FB. FFTS and FB of the GROMOS microwave radiometer agree within 5% above 20 hPa. A later harmonization of both time series will be realized by taking the FFTS as benchmark for the FB. Ozone profiles from the FFTS are also compared to coinciding lidar measurements from the Observatoire Haute Provence (OHP), France. For the time period studied a maximum mean difference (lidar – GROMOS FFTS) of +3.8% at 3.1 hPa and a minimum mean difference of +1.4% at 8 hPa is found. Further, intercomparisons with ozone profiles from other independent instruments are performed: satellite measurements include MIPAS onboard ENVISAT, SABER onboard TIMED, MLS onboard EOS Aura and ACE-FTS onboard SCISAT-1. Additionally, ozonesondes launched from Payerne, Switzerland, are used in the lower stratosphere. Mean relative differences of GROMOS FFTS and these independent instruments are less than 10% between 50 and 0.1 hPa.

Citation: Studer, S., Hocke, K., Pastel, M., Godin-Beekmann, S., and Kämpfer, N.: Intercomparison of stratospheric ozone profiles for the assessment of the upgraded GROMOS radiometer at Bern, Atmos. Meas. Tech. Discuss., 6, 6097-6146, doi:10.5194/amtd-6-6097-2013, 2013.
S. Studer et al.
Interactive discussionStatus: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
RC C2284: 'Review report', Anonymous Referee #2, 29 Aug 2013 Printer-friendly Version Supplement 
RC C2394: 'Reviewer comments', Anonymous Referee #1, 05 Sep 2013 Printer-friendly Version 
AC C4312: 'Author Comment', Klemens Hocke, 07 Feb 2014 Printer-friendly Version Supplement 
S. Studer et al.
S. Studer et al.


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