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Atmosphere 2017, 8(4), 78; doi:10.3390/atmos8040078

Mobile DOAS Observations of Tropospheric NO2 Using an UltraLight Trike and Flux Calculation

1
European Center of Excellence for the Environment, Faculty of Sciences and Environment, “Dunarea de Jos” University of Galati, Str. Domneasca 111, Galati 800008, Romania
2
Royal Belgian Institute for Space Aeronomy, Ringlaan-3-Avenue Circulaire, B-1180 Brussels, Belgium
*
Author to whom correspondence should be addressed.
Academic Editors: Pius Lee, Rick Saylor and Jeff McQueen
Received: 24 February 2017 / Revised: 18 April 2017 / Accepted: 19 April 2017 / Published: 22 April 2017
(This article belongs to the Special Issue Air Quality Monitoring and Forecasting)
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Abstract

In this study, we report on airborne Differential Optical Absorption Spectroscopy (DOAS) observations of tropospheric NO2 using an Ultralight Trike (ULT) and associated flux calculations. The instrument onboard the ULT was developed for measuring the tropospheric NO2 Vertical Column Density (VCD) and it was operated for several days between 2011 and 2014, in the South-East of Romania. Collocated measurements were performed using a car-DOAS instrument. Most of the airborne and mobile ground-based measurements were performed close to an industrial platform located nearby Galati city (45.43° N, 28.03° E). We found a correlation of R = 0.71 between tropospheric NO2 VCDs deduced from airborne DOAS observations and mobile ground-based DOAS observations. We also present a comparison between stratospheric NO2 Slant Column Density (SCD) derived from the Dutch OMI NO2 (DOMINO) satellite data product and stratospheric SCDs obtained from ground and airborne measurements. The airborne DOAS observations performed on 13 August 2014 were used to quantify the NO2 flux originating from an industrial platform located nearby Galati city. Measurements during a flight above the industrial plume showed a maximum tropospheric NO2 VCD of (1.41 ± 0.27) × 1016 molecules/cm2 and an associated NO2 flux of (3.45 ± 0.89) × 10−3 kg/s. View Full-Text
Keywords: mobile DOAS; airborne observations; nitrogen dioxide; emission flux mobile DOAS; airborne observations; nitrogen dioxide; emission flux
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Constantin, D.-E.; Merlaud, A.; Voiculescu, M.; Dragomir, C.; Georgescu, L.; Hendrick, F.; Pinardi, G.; Van Roozendael, M. Mobile DOAS Observations of Tropospheric NO2 Using an UltraLight Trike and Flux Calculation. Atmosphere 2017, 8, 78.

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