Abstract
Abstract. Differential Optical Absorption Spectroscopy (DOAS) is a widely used method to quantify atmospheric trace gases from spectroscopic measurements. While DOAS can, in principal, be described by a linear equation system, usually nonlinearities occur, in particular as a consequence of spectral misalignments. Here we propose to linearise the effects of a spectral shift by including a "shift spectrum", which is the first term of a Taylor expansion, as pseudo-absorber in the DOAS fit. The effects of a spectral stretch are considered as additional wavelength-dependent shifts. Solving the DOAS equation system linearly has several advantages: the solution is unique, the algorithm is robust, and it is very fast. The latter might be particularly important for measurements with high data rates, like for upcoming satellite missions.
Reference25 articles.
1. Beirle, S. and Wagner, T.: Tropospheric vertical column densities of NO2 from SCIAMACHY, available at: http://www.sciamachy.org/products/NO2/NO2tc_v1_0_MPI_AD.pdf (last access: 12 March 2013), 2012.
2. Boersma, K., Eskes, H., and Brinksma, E.: Error analysis for tropospheric NO2 retrieval from space, J. Geophy. Res., 109, D04311, https://doi.org/10.1029/2003JD003962, 2004.
3. Bronstein, I. N. and Semendjajew, K. A.: Taschenbuch der Mathematik, 20th Edn., Verlag Harri Deutsch, Thun, 1981.
4. Chance, K.: Analysis of BrO measurements from the Global Ozone Monitoring Experiment, Geophys. Res. Lett., 25, 3335–3338, https://doi.org/10.1029/98GL52359, 1998.
5. Chance, K. and Kurucz, R. L.: An improved high-resolution solar reference spectrum for Earth's atmosphere measurements in the ultraviolet, visible, and near infrared, J. Quant. Spectrosc. Ra., 111, 1289–1295, https://doi.org/10.1016/j.jqsrt.2010.01.036, 2010.
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