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

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doi:10.5194/amt-2017-7
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
22 Feb 2017
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Ground-based remote sensing of O3 by high and medium resolution FTIR spectrometers over the Mexico City basin
Eddy F. Plaza-Medina1, Wolfgang Stremme1, Alejandro Bezanilla1, Michel Grutter1, Matthias Schneider2, Frank Hase2, and Thomas Blumenstock2 1Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, 04510 Ciudad de México, México
2Institute of Meteorology and Climate Research (IMK-ASF), Karlsruhe Institute of Technology, Karlsruhe, Germany
Abstract. We present atmospheric ozone (O3) profiles measured over central Mexico between November 2012 and February 2014 by two different ground-based FTIR (Fourier transform infrared) solar absorption experiments. The first instrument offers very high resolution spectra and contributes to NDACC (Network for the Detection of Atmospheric Composition Change). It is located at a mountain observatory about 1700 m above the Mexico City basin. The second instrument has a medium spectral resolution and is located inside of Mexico City at a horizontal distance of about 60 km to the mountain observatory. It is documented that the retrieval with the high and medium resolution experiments give O3 variations for three and four independent atmospheric altitude ranges, respectively, whereby the theoretically estimated errors of these profile data are mostly within 10 %. The good quality of the data is empirically demonstrated: above the tropopause by intercomparing the two FTIR O3 data and for the boundary layer by comparing the Mexico City FTIR O3 data with in-situ O3 surface data. Furthermore, we develop a combined boundary layer O3 remote sensing product that uses the retrieval results of both FTIR experiments and demonstrate theoretically and empirically the improvements achieved by such combination.

Citation: Plaza-Medina, E. F., Stremme, W., Bezanilla, A., Grutter, M., Schneider, M., Hase, F., and Blumenstock, T.: Ground-based remote sensing of O3 by high and medium resolution FTIR spectrometers over the Mexico City basin, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2017-7, in review, 2017.
Eddy F. Plaza-Medina et al.
Eddy F. Plaza-Medina et al.
Eddy F. Plaza-Medina et al.

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Short summary
We present data and error estimations of O3 profiles retrieved from spectra measured by a medium and a high resolution FTIR spectrometer (located at 2260 m and 3985 m a.s.l., respectively). Above the tropopause both datasets agree well and in accordance to the estimated errors. We introduce a product that combines the two FTIR retrieval results, and a comparison to Mexico City in-situ data indicates that the combined product is able to capture the highly varying boundary layer O3 concentrations.
We present data and error estimations of O3 profiles retrieved from spectra measured by a medium...
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