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A new in situ instrument for gas-phase formaldehyde(HCHO), COmpact Formaldehyde FluorescencE Experiment (COFFEE), is presented.COFFEE utilizes non-resonant laser-induced fluorescence (NR-LIF) to measureHCHO, with 300 mW of 40 kHz 355 nm laser output exciting multiple HCHOabsorption features. The resulting HCHO fluorescence is collected at 5 nsresolution, and the fluorescence time profile is fit to yield the ambientHCHO mixing ratio. Typical 1<i>σ</i> precision at  ∼  0 pptvHCHO is 150 pptv for 1 s data. The compact instrument was designed tooperate with minimal in-flight operator interaction and infrequentmaintenance (1–2 times per year). COFFEE fits in the wing pod of the AlphaJet stationed at the NASA Ames Research Center and has successfully collectedHCHO data on 27 flights through 2017 March. The frequent flights, combinedwith a potentially long-term data set, makes the Alpha Jet a promisingplatform for validation of satellite-based column HCHO

A new non-resonant laser-induced fluorescence instrument for the airborne in situ measurement of formaldehyde