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. Many processes in the lower atmosphere including transport,turbulent mixing and chemical conversions happen on timescales of the orderof seconds (e.g. at point sources). Remote sensing of atmospheric trace gasesin the UV and visible spectral range (UV–Vis) commonly uses dispersivespectroscopy (e.g. differential optical absorption spectroscopy, DOAS). Therecorded spectra allow for the direct identification, separation andquantification of narrow-band absorption of trace gases. However, thesetechniques are typically limited to a single viewing direction and limited bythe light throughput of the spectrometer set-up. While two-dimensional imagingis possible by spatial scanning, the temporal resolution remains poor (oftenseveral minutes per image). Therefore, processes on timescales of secondscannot be directly resolved by state-of-the-art dispersive methods. We investigate the application of Fabry–Perot interferometers (FPIs) forthe optical remote sensing of atmospheric trace gases in the UV–Vis spectral range. Bychoosing a FPI transmission spectrum, which is optimised to correlate withnarrow-band (ideally periodic) absorption structures of the target trace gas,column densities of the trace gas can be determined with a sensitivity andselectivity comparable to dispersive spectroscopy, using only a small numberof spectral channels (FPI tuning settings). Different from dispersive opticalelements, the FPI can be implemented in full-frame imaging set-ups (cameras),which can reach high spatio-temporal resolution. In principle, FPIcorrelation spectroscopy can be applied for any trace gas with distinctabsorption structures in the UV–Vis range. We present calculations for the application of FPI correlation spectroscopyto SO2 , BrO and NO2 for exemplary measurementscenarios. In addition to high sensitivity and selectivity we find that the spatiotemporal resolution of FPI correlation spectroscopy can be more than 2orders of magnitude higher than state-of-the-art DOAS measurements. As proofof concept we built a 1-pixel prototype implementing the technique for SO2 in the UV. Good agreement with our calculations and conventionalmeasurement techniques is demonstrated and no cross sensitivities to othertrace gases are observed.

Towards imaging of atmospheric trace gases using Fabry–Pérot interferometer correlation spectroscopy in the UV and visible spectral range