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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-2018-348
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-348
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 11 Dec 2018

Research article | 11 Dec 2018

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

Studies of the horizontal inhomogeneities in NO2 concentrations above a shipping lane using ground-based MAX-DOAS and airborne imaging DOAS measurements

André Seyler1, Andreas C. Meier1, Folkard Wittrock1, Lisa Kattner1,2, Barbara Mathieu-Üffing1,2,a, Enno Peters1,b, Andreas Richter1, Thomas Ruhtz3, Anja Schönhardt1, Stefan Schmolke2, and John P. Burrows1 André Seyler et al.
  • 1Institute of Environmental Physics, University of Bremen, Germany
  • 2Federal Maritime and Hydrographic Agency (BSH), Hamburg, Germany
  • 3Institute for Space Sciences, Freie Universität Berlin, Germany
  • anow at: State Agency for Agriculture, Environment and Rural Areas Schleswig-Holstein (LLUR), Germany
  • bnow at: Institute for the Protection of Maritime Infrastructures, German Aerospace Center (DLR), Bremerhaven, Germany

Abstract. This study describes a novel application of an onion peeling like approach to MAX-DOAS measurements of shipping emissions aiming at investigating the strong horizontal inhomogeneities in NO2 over a shipping lane. To monitor ship emissions on the main shipping route towards the port of Hamburg, a two-channel (UV and visible) MAX-DOAS instrument was deployed on the island Neuwerk in the German Bight, 6–7km south of the main shipping lane. Utilizing the fact that the effective light path length in the atmosphere depends systematically on wavelength, simultaneous measurements and DOAS retrievals in the UV and visible spectral range are used to probe air masses at different horizontal distances to the instrument to estimate two-dimensional pollutant distributions. Two case-studies have been selected to demonstrate the ability to derive the approximate plume positions in the observed area. A situation with northerly wind shows high NO2 concentrations close to the measurement site and low values in the north of the shipping lane. The opposite situation with southerly wind, unfavorable for the on-site in situ instrumentation, demonstrates the ability to detect enhanced NO2 concentrations several kilometers away from the instrument. To validate the approach, a comparison to air-borne imaging DOAS measurements during the NOSE campaign in July 2013 is performed, showing good agreement between the approximate plume position derived from the onion peeling MAX-DOAS and the air-borne measurements. Combining synergistically information about the plume width from the air-borne measurements and about the vertical plume extent from MAX-DOAS, yields NO2 concentrations in the plume from both measurements which agree very well.

André Seyler et al.
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Short summary
This study describes a novel application of an onion peeling like approach to MAX-DOAS measurements of shipping emissions aiming at investigating the inhomogenous NO2 field over a shipping lane. Case studies for different wind conditions demonstrate the ability to derive the approximate plume positions in the observed area, which are in good agreement with simultaneous air-borne imaging DOAS measurements. NO2 concentrations in a plume retrieved from both measurement techniques agree very well.
This study describes a novel application of an onion peeling like approach to MAX-DOAS...
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