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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-121
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-121
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 28 Mar 2019

Research article | 28 Mar 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Ground-based measurements of middle-atmospheric carbon monoxide above Ny-Ålesund (78.9° N, 11.9° E)

Niall J. Ryan1, Mathias Palm1, Christoph G. Hoffmann2, Jens Goliasch3, and Justus Notholt1 Niall J. Ryan et al.
  • 1Institute of Environmental Physics, University of Bremen, Bremen, 28359, Germany
  • 2Institute of Physics, University of Greifswald, Felix-Hausdorff-Str. 6, 17489, Greifswald, Germany
  • 3RPG-Radiometer Physics GmbH, Werner-von-Siemens-Str. 4, 53340 Meckenheim, Germany

Abstract. We present a new ground-based system for measurements of middle-atmospheric carbon monoxide (CO) at Ny Ålesund, Svalbard, and the altitude profiles of CO volume mixing ratios (VMR) measured during the 2017/2018 winter. The Carbon Monoxide Radiometer for Atmospheric Measurements (CORAM) records spectra from CO emissions in the middle-atmosphere with the aid of a low-noise amplifier designed for the 230 GHz spectral region. Altitude profiles of CO VMRs are retrieved from the measured spectra using an optimal estimation inversion technique. The profiles in the current dataset have an average altitude range of 47–87 km and an estimated precision peaking at ~ 12 % of the a priori used in the inversion. The CORAM profiles are compared to collocated CO measurements from the Microwave Limb Sounder (MLS) aboard the Aura satellite and show a difference of 7.4–16.1 %, with a maximum absolute difference of 2.5 ppmv at 86 km altitude. CO profiles are currently available at 1 hr resolution between November 2017 and January 2018.

Niall J. Ryan et al.
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Niall J. Ryan et al.
Niall J. Ryan et al.
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Short summary
We present a new ground-based instrument (CORAM) that measures atmospheric carbon monoxide (CO) concentrations within approximately 47–87 km altitude, with a 1 hour time resolution. The measurements are made at Ny-Ålesund (79N), Svalbard, and add much-needed coverage to the high-Arctic. The first measured CO profiles from winter 2017/2018 are compared to collocated measurements from the Aura-MLS satellite instrument and show agreement on a daily and monthly timescale.
We present a new ground-based instrument (CORAM) that measures atmospheric carbon monoxide (CO)...
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