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A cavity-enhanced ultraviolet absorption instrument for high-precision,...

Hannun, R. A., A. Swanson, S. A. Bailey, T. F. Hanisco, T. P. Bui, I. Bourgeois, J. Peischl, and T. B. Ryerson (2020), A cavity-enhanced ultraviolet absorption instrument for high-precision, fast-time-response ozone measurements, Atmos. Meas. Tech., 13, 6877-6887, doi:10.5194/amt-13-6877-2020.

The NASA Rapid Ozone Experiment (ROZE) is a broadband cavity-enhanced UV (ultraviolet) absorption instrument for the detection of in situ ozone (O3 ). ROZE uses an incoherent LED (light-emitting diode) light source coupled to a high-finesse optical cavity to achieve an effective pathlength of ∼ 104 m. Due to its high sensitivity and small optical cell volume, ROZE demonstrates a 1σ precision of 80 pptv (parts per trillion by volume) in 0.1 s and 31 pptv in a 1 s integration time, as well as an e-fold time response of 50 ms. ROZE can be operated in a range of field environments, including low- and high-altitude research aircraft, and is particularly suited to O3 vertical-flux measurements using the eddy covariance technique. ROZE was successfully integrated aboard the NASA DC-8 aircraft during July– September 2019 and validated against a well-established chemiluminescence measurement of O3 . A flight within the marine boundary layer also demonstrated flux measurement capabilities, and we observed a mean O3 deposition velocity of 0.029 ± 0.005 cm s−1 to the ocean surface. The performance characteristics detailed below make ROZE a robust, versatile instrument for field measurements of O3 .

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Research Program: 
Tropospheric Composition Program (TCP)
Upper Atmosphere Research Program (UARP)
Funding Sources: 
NASA Internal Research and Development (IRAD) program