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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 13 | Copyright
Atmos. Chem. Phys., 9, 4447-4465, 2009
https://doi.org/10.5194/acp-9-4447-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  10 Jul 2009

10 Jul 2009

Accurate satellite-derived estimates of the tropospheric ozone impact on the global radiation budget

J. Joiner1, M. R. Schoeberl1, A. P. Vasilkov2, L. Oreopoulos1, S. Platnick1, N. J. Livesey3, and P. F. Levelt4 J. Joiner et al.
  • 1NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 2Science Systems and Applications Inc., Lanham, MD, USA
  • 3Jet Propulsion Laboratory, Pasadena, CA, USA
  • 4Royal Netherlands Meteorological Institute (KNMI), de Bilt, The Netherlands

Abstract. Estimates of the radiative forcing due to anthropogenically-produced tropospheric O3 are derived primarily from models. Here, we use tropospheric ozone and cloud data from several instruments in the A-train constellation of satellites as well as information from the GEOS-5 Data Assimilation System to accurately estimate the radiative effect of tropospheric O3 for January and July 2005. Since we cannot distinguish between natural and anthropogenic sources with the satellite data, our derived radiative effect reflects the unadjusted (instantaneous) effect of the total tropospheric O3 rather than the anthropogenic component. We improve upon previous estimates of tropospheric ozone mixing ratios from a residual approach using the NASA Earth Observing System (EOS) Aura Ozone Monitoring Instrument (OMI) and Microwave Limb Sounder (MLS) by incorporating cloud pressure information from OMI. We focus specifically on the magnitude and spatial structure of the cloud effect on both the short- and long-wave radiative budget. The estimates presented here can be used to evaluate the various aspects of model-generated radiative forcing. For example, our derived cloud impact is to reduce the radiative effect of tropospheric ozone by ~16%. This is centered within the published range of model-produced cloud effect on unadjusted ozone radiative forcing.

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