Airborne multi-axis DOAS measurements of tropospheric SO₂ plumes in the Po-valley, Italy

P. Wang (1) , A. Richter (1) , M. Bruns (1) , J. P. Burrows (1) , W. Junkermann (2) , K.-P. Heue (1) , T. Wagner (1) , U. Platt (1) , I. Pundt (1)

1 IUP - Institute of Environmental Physics [Bremen]
2 IMK-IFU - Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung

During the second FORMAT (FORMaldehyde as A Tracer of oxidation in the troposphere) campaign in 2003 the airborne multi-axis DOAS instrument (AMAXDOAS) performed spectroscopic measurements of SO₂ from the city of Mantova and the power plant Porto Tolle using scattered sun-light during two flights on 26 and 27 September 2003. Measurements were performed in 10 different viewing directions, providing information on the vertical SO₂ distribution and the SO₂ vertical column. The SO₂ emission flux from the power plant Porto Tolle was calculated to 1.6×10²⁵ molec cm^-2 (1.7 kg s^-1) and was found to be the same on both measurement days, and also comparable to official emission data, which quote 2.25×10²⁵ molec s^-1 (26 September) and 2.07×10²⁵ molec s^-1 (27 September). Over the city of Mantova, the observed SO₂ vertical columns were 1.1×10¹⁶ molec cm^-2 and 1.9×10¹⁶ molec cm^-2 on 26 and 27 September, respectively. This is in good agreement with ground-based measurements of 5.9 ppbv and 10.0 ppbv which correspond to 1.2×10¹⁶ molec cm^-2 and 2.2×10¹⁶ molec cm^-2.

Domaines: Océan, Atmosphère

P. Wang, A. Richter, M. Bruns, J. P. Burrows, W. Junkermann, et al.. Airborne multi-axis DOAS measurements of tropospheric SO₂ plumes in the Po-valley, Italy. Atmospheric Chemistry and Physics Discussions, 2005, 5 (2), pp.2017-2045. ⟨hal-00301159⟩