Perspectives of 2D and 3D mapping of atmospheric pollutants over urban areas by means of airborne DOAS spectrometers

G. Giovanelli, E. Palazzi, A. Petritoli, D. Bortoli, I. Kostadinov, F. Margelli, S. Pagnutti, M. Premuda, F. Ravegnani, G. Trivellone


offering numerous advantages over conventional networks of in situ analysers. We propose some innovative
solutions in the field of DOAS (Differential Optical Absorption Spectroscopy) remote systems, utilizing diffuse solar
light as the radiation source. We examine the numerous potentialities of minor gas slant column calculations,
applying the «off-axis» methodology for collecting the diffuse solar radiation. One of these particular approaches,
using measurements along horizontal paths, has already been tested with the spectrometer installed on board the
Geophysica aircraft during stratospheric flights up to altitudes of 20 km. The theoretical basis of these new measurement
techniques using DOAS remote sensing systems are delineated to assess whether low altitude flights can
provide 2D and 3D pollution tomography over metropolitan areas. The 2D or 3D trace gas total column mapping
could be used to investigate: i) transport and dispersion phenomena of air pollution, ii) photochemical process rates,
iii) gas plume tomography, iv) minor gas vertical profiles into the Planetary Boundary Layer and v) minor gas flux
divergence over a large area.


DOAS applications in urban areas;atmospheric pollutants tomography;aircraft measurements of atmospheric trace gases

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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X