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. A system based on incoherent broadband cavity-enhancedabsorption spectroscopy (IBBCEAS) has been developed for simultaneousmeasurement of nitrogen dioxide ( NO2 ), glyoxal (GLY), and methylglyoxal(MGLY). In this system, the measured light absorption at around 460 nm isspectrally resolved. The concentration of absorbers is determined from amulticomponent fit. At an integration time of 100 s, the measurementsensitivity ( 2σ ) for NO2 , GLY, and MGLY is 18, 30, and100 ppt, respectively. The measurement uncertainty, which mainly originatesfrom path length calibration, sampling loss, and uncertainty of absorptioncross sections is estimated to be 8 % for NO2 , 8 % for GLY, and16 % for MGLY. When deploying the instrument during field observations, wefound significant influence of NO2 on the spectra fitting forretrieving GLY and MGLY concentrations, which is caused by the fact that NO2 has a higher absorption cross section and higher ambientconcentration. In order to minimize such an effect, a NO2 photolyticconvertor (NPC), which removes sampled NO2 at an efficiency of 76 %,was integrated on the IBBCEAS system. Since sampled GLY and MGLY are mostly( ≥95  %) conserved after passing through the NPC, the quality of thespectra fitting and the measurement accuracy of ambient GLY and MGLY under NO2 -rich environments could be improved.

atmospheric measurement techniques

An IBBCEAS system for atmospheric measurements of glyoxal and methylglyoxal in the presence of high NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; concentrations