High-resolution measurements from the airborne Atmospheric Nitrogen Dioxide Imager (ANDI)
Other literature type
Lawrence, J. P.
Anand, J. S.
Vande Hey, J. D.
Leigh, R. R.
Monks, P. S.
Leigh, R. J.
Nitrogen dioxide is both a primary pollutant with direct health effects and a
key precursor of the secondary pollutant ozone. This paper reports on the
development, characterisation and test flight of the Atmospheric Nitrogen
Dioxide Imager (ANDI) remote sensing system. The ANDI system includes an
imaging UV/Vis grating spectrometer able to capture scattered sunlight
spectra for the determination of tropospheric nitrogen dioxide (NO<sub>2</sub>)
concentrations by way of DOAS slant column density and vertical column
Results are shown for an ANDI test flight over Leicester City in the UK on a
cloud-free winter day in February 2013. Retrieved NO<sub>2</sub> columns gridded to
a surface resolution of 80 m × 20 m revealed hotspots in a series of
locations around Leicester City, including road junctions, the train station,
major car parks, areas of heavy industry, a nearby airport (East Midlands)
and a power station (Ratcliffe-on-Soar). In the city centre the dominant
source of NO<sub>2</sub> emissions was identified as road traffic, contributing to
a background concentration as well as producing localised hotspots.
Quantitative analysis revealed a significant urban increment over the city
centre which increased throughout the flight.