Hannun, Reem A.Swanson, Andrew K.Bailey, Steven A.Hanisco, Thomas F.Bui, T. PaulBourgeois, IlannPeischl, JeffRyerson, Thomas B.2020-08-172020-08-172020-07-22Hannun, Reem A.; Swanson, Andrew K.; Bailey, Steven A.; Hanisco, Thomas F.; Bui, T. Paul; Bourgeois, Ilann; Peischl, Jeff; Ryerson, Thomas B.; A Cavity-Enhanced UV Absorption Instrument for High Precision, Fast Time Response Ozone Measurements; Atmospheric Measurement Techniques (2020); https://amt.copernicus.org/preprints/amt-2020-195/https://doi.org/10.5194/amt-2020-195http://hdl.handle.net/11603/19451The NASA Rapid Ozone Experiment (ROZE) is a broadband cavity-enhanced UV absorption instrument for the detection of in situ ozone (O₃). ROZE uses an incoherent LED 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 (0.1 s) and 31 pptv (1 s), as well as a 1/e response time 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 O₃.20 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Attribution 4.0 International (CC BY 4.0)Text