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Observations of Atmospheric NO2 Using a New Low-Cost MAX-DOAS System

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Faculty of Sciences and Environment, European Centre of Excellence for the Environment, “Dunarea de Jos” University of Galati, Domneasca Street, no. 111, 800201 Galati, Romania
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Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Ringlaan-3-Avenue Circulaire, B-1180 Brussels, Belgium
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Author to whom correspondence should be addressed.
Atmosphere 2020, 11(2), 129; https://doi.org/10.3390/atmos11020129
Received: 2 December 2019 / Revised: 18 January 2020 / Accepted: 21 January 2020 / Published: 24 January 2020
(This article belongs to the Special Issue Air Quality in Romania)
This article describes the prototype of a new MAX-DOAS (multi-axis differential optical absorption spectroscopy) system built at “Dunarea de Jos” University of Galati (UGAL), Romania, and the first results of its use to observe NO2 content over Galati city (45.42° N, 28.04° E). The new equipment is a ground-based MAX-DOAS system capable of measuring the spatial distribution of DSCD (differential slant column densities) of several trace gases using horizontal and vertical observations. The new optic system, named UGAL-2-DOAS, is an in-house, low-cost, solution in comparison to the existing market of the MAX-DOAS systems. This paper describes the technical design and capabilities of the new MAX-DOAS instrument. The UGAL-2D-DOAS system was tested in April and June 2017 in Galati city. Measurements over three days were selected for the present manuscript. Full azimuthal (0–360°), local celestial meridian observations and other elevation angle sequence measurements (e.g., E–W) were performed. We found that the new MAX-DOAS system is able to detect diurnal variation and the local source emissions of NO2 from the urban environment. Also, we present concomitant zenith-sky car-DOAS observations measurements around the location of the new MAX-DOAS instrument. Comparing the horizontal scanning sequence of the new developed instrument with the mobile DOAS observations, we found that both systems can indicate and detect the same NO2 sources.
Keywords: UV–Vis spectroscopy; atmospheric remote sensing; nitrogen dioxide; MAX-DOAS; mobile DOAS UV–Vis spectroscopy; atmospheric remote sensing; nitrogen dioxide; MAX-DOAS; mobile DOAS
MDPI and ACS Style

Roşu, A.; Constantin, D.-E.; Voiculescu, M.; Arseni, M.; Merlaud, A.; Van Roozendael, M.; Georgescu, P.L. Observations of Atmospheric NO2 Using a New Low-Cost MAX-DOAS System. Atmosphere 2020, 11, 129.

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