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. We report the development of an instrument forsimultaneous fast measurements of glyoxal (CHOCHO) and NO2 based onincoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) inthe 438–465 nm wavelength region. The highly reflective cavity mirrorswere protected from contamination by N2 purge gas. The reduction of theeffective cavity length was calibrated by measuring collision-induced oxygenabsorption at ∼477  nm of pure oxygen gas input with andwithout the N2 mirror purge gas. The detection limits of the developedsystem were evaluated to be 23 parts per trillion by volume (pptv, 2 σ ) for CHOCHO and 29 pptv (2 σ ) for NO2 with a 30 s acquisitiontime. A potential cross-interference of NO2 absorption onaccurate CHOCHO measurements has been investigated in this study, as theabsorption of NO2 in the atmosphere could often be several hundred-foldhigher than that of glyoxal, especially in contaminated areas. Due tonon-linear spectrometer dispersion, simulation spectra of NO2 based ontraditional convolution simulation did not match the measurement spectrawell enough. In this work, we applied actual NO2 spectral profilemeasured by the same spectrometer as a reference spectral profile insubsequent atmospheric spectral analysis and retrieval of NO2 andCHOCHO concentrations. This effectively reduced the spectral fittingresiduals. The instrument was successfully deployed for 24 d ofcontinuous measurements of CHOCHO and NO2 in the atmosphere in acomprehensive field campaign in Beijing in June 2017.

atmospheric measurement techniques

Development of an incoherent broadband cavity-enhanced absorption spectrometer for measurements of ambient glyoxal and NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; in a polluted urban environment