Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 3 2 2010 10.5194/amtd-3-863-2010 http://www.atmos-meas-tech-discuss.net/3/863/2010/ http://www.atmos-meas-tech-discuss.net/3/863/2010/amtd-3-863-2010.html http://www.atmos-meas-tech-discuss.net/3/863/2010/amtd-3-863-2010.pdf 863 889 2010-03-03 Novel SO₂ spectral evaluation scheme using the 360–390 nm wavelength range N. Bobrowski n.bobrowski@iup.uni-heidelberg.de C. Kern U. Platt C. Hörmann T. Wagner Institute for Environmental Physics, University of Heidelberg, Germany Max-Planck Institute for Chemistry, Mainz, Germany Differential Optical Absorption Spectroscopy (DOAS) is a well established spectroscopic method to determine trace gases in the atmosphere. During the last decade, passive DOAS, which uses solar radiation scattered in the atmosphere as a light source, has become a standard tool to determine SO₂ column densities and emission fluxes from volcanoes and other large sources by ground based as well as satellite measurements. For the determination of SO₂ column densities, the structured absorption of the molecule in the 300–330 nm region (due to the A¹B₁←X¹A₁ transition) is used. However, there are several problems limiting the accuracy of the technique in this particular application. Here we propose to use an alternative wavelength region (360–390 nm) due to the spin-forbidden a³B₂←X¹A₁ transition for the DOAS evaluation of SO₂ in conditions where high SO₂ column densities prevail. We show this range to have considerable advantages in such cases, in particular when the particle content of the plume is high and when measurements are performed at large distances from the area of interest. 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