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

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https://doi.org/10.5194/amt-2017-179
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
25 Jul 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Retrieving Vertical Ozone Profiles from Measurements of Global Spectral Irradiance
Germar Bernhard1, Irina Petropavlovskikh2,3, and Bernhard Mayer4 1Biospherical Instruments Inc., San Diego, CA 92110, USA
2Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colo rado, Boulder, CO 80309, USA
3NOAA Earth System Research Laboratory, Global Monitoring Division, Boulder, CO 80305, USA
4Ludwig-Maximilians-Universität, Munich, 80333, Germany
Abstract. A new method is presented to determine vertical ozone profiles from measurements of spectral global (direct Sun plus upper hemisphere) irradiance in the UV. The method is similar to the widely used Umkehr technique, which inverts measurements of zenith sky radiance. The procedure was applied to measurements of a high-resolution spectroradiometer installed near the centre of the Greenland ice sheet. Retrieved profiles were validated with balloon sonde observations and ozone profiles from the space-borne Microwave Limb Sounder (MLS). Depending on altitude, the bias between retrieval results presented in this paper and MLS observations ranges between −5 % and +3 %. The magnitude of this bias is comparable, if not smaller, to values reported in the literature for the standard Dobson Umkehr method. Total ozone columns (TOCs) calculated from the retrieved profiles agree to within 0.7 ± 2.0 % (±1σ) with TOCs measured by the Ozone Monitoring Instrument (OMI) onboard the Aura satellite. The new method is called the “Global-Umkehr” method.

Citation: Bernhard, G., Petropavlovskikh, I., and Mayer, B.: Retrieving Vertical Ozone Profiles from Measurements of Global Spectral Irradiance, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-179, in review, 2017.
Germar Bernhard et al.
Germar Bernhard et al.

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UVSIMN Version2 Summit
G. Bernhard
https://doi.org/10.18739/A2B60B
Germar Bernhard et al.

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Short summary
The vertical distribution of atmospheric ozone has historically been measured from the ground by analyzing the wavelength dependence of zenith radiation. Our method retrieves the same information from global irradiance, which is defined as radiant flux received from the entire upper hemisphere, including the Sun. The new method makes existing long-term datasets of global irradiance available for studying the ozone profile. The accuracy of the new method is similar to that of the legacy method.
The vertical distribution of atmospheric ozone has historically been measured from the ground by...
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