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. An incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS)instrument for quantification of atmospheric trace gases that absorb in thecyan region of the electromagnetic spectrum (470 to 540 nm), including NO2 and I2 , is described. The instrument uses alight-emitting diode coupled to a 1 m optical cavity consisting of a pair ofmirrors in stable resonator configuration. Transmitted light is monitoredusing a grating spectrometer and charge-coupled device array detector. Theaverage mirror reflectivity was determined from the N2∕He and Ar∕He ratios of scattering coefficients and was ∼99.98  % at its maximum,yielding an effective optical path length of 6.3 km. Cross sections of N2 , O2 , air, Ar, CO2 , and CH4 scattering andof O 4 absorption were measured and agree with literature values withinthe measurement uncertainty. Trace gas mixing ratios were retrieved using thespectral fitting software DOASIS (DOAS intelligent system) from 480 to 535 nm. Under laboratoryconditions, the 60 s, 1σ measurement precisions were ±124 and ±44  pptv for NO2 and I2 , respectively. The IBBCEASinstrument sampled ambient air in Ucluelet, BC, Canada, in July 2015. IBBCEASretrievals agreed with independent measurements of NO2 by bluediode laser cavity ring-down spectroscopy ( r2=0.975 ), but ambient I2 concentrations were below the detection limit.

A broadband cavity-enhanced spectrometer for atmospheric trace gas measurements and Rayleigh scattering cross sections in the cyan region (470–540 nm)