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| Titel |
DOAS measurements of NO2 from an ultralight aircraft during the Earth Challenge expedition |
| VerfasserIn |
A. Merlaud, M. Roozendael, J. Gent, C. Fayt, J. Maes, X. Toledo-Fuentes, O. Ronveaux, M. Mazière |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 8 ; Nr. 5, no. 8 (2012-08-24), S.2057-2068 |
| Datensatznummer |
250003056
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| Publikation (Nr.) |
 copernicus.org/amt-5-2057-2012.pdf |
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| Zusammenfassung |
| We report on airborne Differential Optical Absorption Spectroscopy (DOAS)
measurements of NO2 tropospheric columns above South Asia, the Arabic
peninsula, North Africa, and Italy in November and December 2009. The DOAS
instrument was installed on an ultralight aircraft involved in the Earth
Challenge project, an expedition of seven pilots flying on four ultralight
aircraft between Australia and Belgium. The instrument recorded spectra in
limb geometry with a large field of view, a set-up which provides a high
sensitivity to the boundary layer NO2 while minimizing the
uncertainties related to the attitude variations. We compare our measurements
with OMI (Ozone Monitoring Instrument) and GOME-2 (Global Ozone Monitoring
Experiment 2) tropospheric NO2 products when the latter are
available. Above Rajasthan and the Po Valley, two areas where the NO2
field is homogeneous, data sets agree very well. Our measurements in these
areas are 0.1 ± 0.1 to 3 ± 1 × 1015 molec cm−2 and
2.6 ± 0.8 × 1016 molec cm−2, respectively. Flying downwind of
Riyadh, our NO2 measurements show the structure of the megacity's
exhaust plume with a higher spatial resolution than OMI. Moreover, our
measurements are larger (up to 40%) than those seen by satellites. We also
derived tropospheric columns when no satellite data were available if it was
possible to get information on the visibility from satellite measurements of
aerosol optical thickness. This experiment also provides a confirmation for
the recent finding of a soil signature above desert. |
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