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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-2019-33
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-33
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 15 Apr 2019

Research article | 15 Apr 2019

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

Full-azimuthal imaging-DOAS observations of NO2 and O4 during CINDI-2

Enno Peters1,2, Mareike Ostendorf1, Tim Bösch1, André Seyler1, Anja Schönhardt1, Stefan F. Schreier3, Jeroen Sebastiaan Henzing4, Folkard Wittrock1, Andreas Richter1, Mihalis Vrekoussis5,6,7, and John P. Burrows1 Enno Peters et al.
  • 1Institute of Environmental Physics (IUP), University of Bremen, Germany
  • 2Institute for the Protection of Maritime Infrastructures, German Aerospace Center (DLR), Bremerhaven, Germany
  • 3Institute of Meteorology, University of Natural Resources and Life Sciences, Vienna, Austria
  • 4Netherlands Organisation for Applied Scientific Research (TNO), Utrecht, the Netherlands
  • 5Laboratory for Modeling and Observation of the Earth System (LAMOS), Institute of Environmental Physics (IUP), University of Bremen, Germany
  • 6Center for Marine Environmental Sciences (MARUM), University of Bremen, Germany
  • 7Energy, Environment and Water Research Centre, The Cyprus Institute (CyI), Nicosia, Cyprus

Abstract. A novel imaging-DOAS instrument (IMPACT) is presented combining full-azimuthal pointing (360°) with a large vertical coverage (~ 40°). Complete panoramic scans are acquired at a temporal resolution of ~ 15 minutes enabling the retrieval of NO2 vertical profiles over the entire panorama around the measurement site.

IMPACT showed excellent agreement (correlation > 99 %) with coinciding MAX-DOAS measurements during the CINDI-2 campaign. The temporal variability of NO2 slant columns within a typical MAX-DOAS vertical scanning sequence could be resolved and was as large as 20 % in a case study under good viewing conditions. The variation of corresponding profiles and surface concentrations were even larger (40 %). This variability is missed when retrieving trace gas profiles based on standard MAX-DOAS measurements.

The azimuthal distribution of NO2 around the measurement site showed inhomogeneities (relative differences) up to 120 % (on average 35 %) on short time scales (individual panoramic scans). This is more than expected taking into account the semi-rural location. One reason for this are transport events. Exploiting the instrument's advantages, the plume's trajectory during a prominent transport event could be reconstructed.

Furthermore, the potential of retrieving information about the aerosol phase function from O4 slant columns along multiple almucantar scans of IMPACT is demonstrated, with promising results for future studies.

Enno Peters et al.
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Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Enno Peters et al.
Enno Peters et al.
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Short summary
A novel imaging-DOAS instrument (IMPACT) is presented for measurements of nitrogen dioxide (NO2) in the atmosphere. The instrument combines full-azimuthal pointing (360°) with a large vertical coverage (40°). Complete panoramic scans and vertical NO2 profiles around the measurement site are acquired at a temporal resolution of 15 minutes. In addition, information about the aerosol phase function is retrieved from O4 slant columns along multiple almucantar scans measured simultaneously by IMPACT.
A novel imaging-DOAS instrument (IMPACT) is presented for measurements of nitrogen dioxide (NO2)...
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