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We describe a two-channel broadband cavity enhanced absorption spectrometer (BBCEAS)for aircraft measurements of glyoxal (CHOCHO), methylglyoxal(CH3COCHO), nitrous acid (HONO), nitrogen dioxide (NO2), and water(H2O). The instrument spans 361–389 and 438–468 nm, using twolight-emitting diodes (LEDs) and a single grating spectrometer with acharge-coupled device (CCD) detector. Robust performance is achieved using acustom optical mounting system, high-power LEDs with electronic on/offmodulation, high-reflectivity cavity mirrors, and materials that minimizeanalyte surface losses. We have successfully deployed this instrument duringtwo aircraft and two ground-based field campaigns to date. The demonstratedprecision (2σ) for retrievals of CHOCHO, HONO and NO2 are 34,350, and 80 parts per trillion (pptv) in 5 s. The accuracy is 5.8,9.0, and 5.0 %, limited mainly by the available absorption crosssections

atmospheric measurement techniques

A broadband cavity enhanced absorption spectrometer for aircraft measurements of glyoxal, methylglyoxal, nitrous acid, nitrogen dioxide, and water vapor