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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2020-195
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-195
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  22 Jul 2020

22 Jul 2020

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This preprint is currently under review for the journal AMT.

A Cavity-Enhanced UV Absorption Instrument for High Precision, Fast Time Response Ozone Measurements

Reem A. Hannun1,2, Andrew K. Swanson1,3, Steven A. Bailey1, Thomas F. Hanisco1, T. Paul Bui4, Ilann Bourgeois5,6, Jeff Peischl5,6, and Thomas B. Ryerson5 Reem A. Hannun et al.
  • 1Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Spaceflight Center, Greenbelt, MD, USA
  • 2Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, MD, USA
  • 3Universities Space Research Association, Columbia, MD, USA
  • 4Earth Science Division, NASA Ames Research Center, Moffett Field, CA, USA
  • 5NOAA Chemical Sciences Laboratory, Boulder, CO, USA
  • 6Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, USA

Abstract. The 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.

Reem A. Hannun et al.

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Reem A. Hannun et al.

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Latest update: 08 Aug 2020
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Short summary
We have developed a cavity enhanced absorption instrument to measure ozone in the atmosphere. The detection technique enables highly sensitive measurements in fast averaging times. The compact, robust instrument is suitable for operation in varied field environments, including aboard research aircraft. We have successfully flown the instrument and demonstrated its performance capabilities with measurements of ozone deposition rates over the coastal Pacific Ocean.
We have developed a cavity enhanced absorption instrument to measure ozone in the atmosphere....
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