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Atmospheric trace gas measurements by cavity assisted long-path absorptionspectroscopy are an emerging technology. An interesting approach is thecombination of CEAS with broadband light sources, the broadband CEAS(BB-CEAS). BB-CEAS lends itself to the application of the DOAS technique toanalyse the derived absorption spectra. While the DOAS approach has enormousadvantages in terms of sensitivity and specificity of the measurement, animportant implication is the reduction of the light path by the trace gasabsorption, since cavity losses due to absorption by gases reduce thequality (Q) of the cavity. In fact, at wavelength, where the quality of theBB-CEAS cavity is dominated by the trace gas absorption (especially at veryhigh mirror reflectivity), the average light path will vary nearly inverselywith the trace gas concentration and the strength of the band will becomeonly weakly dependent on the trace gas concentration c in the cavity, (thedifferential optical density being proportional to the logarithm of thetrace gas concentration). Only in the limiting case where the mirrorreflectivity determines Q at all wavelength, the strength of the band asseen by the CE-DOAS instrument becomes directly proportional to theconcentration <I>c</I>. We investigate these relationships in detail and presentmethods to correct for the cases between the two above extremes, which areof course the important ones in practice

Broadband Cavity Enhanced Differential Optical Absorption Spectroscopy (CE-DOAS) – applicability and corrections