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https://doi.org/10.5194/amt-2017-484
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
30 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Potential sources of a priori ozone profiles for TEMPO tropospheric ozone retrievals
Matthew S. Johnson1, Xiong Liu2, Peter Zoogman2,a, John Sullivan3, Michael J. Newchurch4, Shi Kuang5, Thierry Leblanc6, and Thomas McGee3 1Earth Science Division, NASA Ames Research Center, Moffett Field, CA, USA
2Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
3Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
4Atmospheric Science Department, University of Alabama in Huntsville, Huntsville, AL, USA
5Earth System Science Center, University of Alabama in Huntsville, Huntsville, AL, USA
6Table Mountain Facility, California Institute of Technology, Wrightwood, CA, USA
aalso at: Minerva Schools at KGI, San Francisco, CA, USA
Abstract. Potential sources of a priori ozone (O3) profiles for use in Tropospheric Emissions: Monitoring of Pollution (TEMPO) satellite tropospheric O3 retrievals are evaluated with observations from multiple Tropospheric Ozone Lidar Network (TOLNet) systems in North America. An O3 profile climatology (tropopause-based O3 climatology (TB-Clim), currently proposed for use in TEMPO O3 retrieval algorithms) based on ozonesonde observations and O3 profiles from 3 separate models (operational Goddard Earth Observing System (GEOS-5) Forward Processing (FP) product, reanalysis product from Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA2), and the GEOS-Chem chemical transport model (CTM)) were: 1) evaluated with TOLNet measurements on various temporal scales (seasonally, daily, hourly) and 2) implemented as a priori information in theoretical TEMPO tropospheric O3 retrievals in order to determine how each a priori impacts the accuracy of retrieved tropospheric (0–10 km) and lowermost tropospheric (LMT, 0–2 km) O3 columns. We found that all potential sources of a priori profiles evaluated in this study generally reproduced the vertical structure of summer-averaged observations of O3 profiles. However, larger differences between the a priori profiles and lidar observations were observed when evaluating inter-daily and diurnal variability of tropospheric O3. The TB-Clim O3 profile climatology was unable to replicate observed inter-daily and diurnal variability of O3 while model products, in particular GEOS-Chem simulations, displayed more skill in reproducing these features. Due to the ability of models, primarily the CTM used in this study, on average to capture the inter-daily and diurnal variability of tropospheric and LMT O3 columns, using a priori profiles from these model simulations resulted in TEMPO retrievals with the best statistical comparison with lidar observations. Furthermore, important from an air quality perspective, when high LMT O3 values are observed, using GEOS-Chem a priori profiles resulted in TEMPO LMT O3 retrievals with the least bias.

Citation: Johnson, M. S., Liu, X., Zoogman, P., Sullivan, J., Newchurch, M. J., Kuang, S., Leblanc, T., and McGee, T.: Potential sources of a priori ozone profiles for TEMPO tropospheric ozone retrievals, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-484, in review, 2018.
Matthew S. Johnson et al.
Matthew S. Johnson et al.
Matthew S. Johnson et al.

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Short summary
This research was conducted to determine the representativeness of the TB-Clim a priori ozone (O3) profile product currently suggested to be used in Tropospheric Emissions: Monitoring of Pollution (TEMPO) satellite retrievals. This study determined that the TB-Clim profiles generally could not reproduce daily/diurnal O3 observations and that modeled profile products were more accurate. These modeled a priori O3 profile data resulted in more accurate theoretical TEMPO tropospheric O3 retrievals.
This research was conducted to determine the representativeness of the TB-Clim a priori ozone...
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