ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-4447-2009 Accurate satellite-derived estimates of the tropospheric ozone impact on the global radiation budget Joiner J. 1 Schoeberl M. R. 1 Vasilkov A. P. 2 Oreopoulos L. 1 Platnick S. 1 Livesey N. J. 3 Levelt P. F. 4 NASA Goddard Space Flight Center, Greenbelt, MD, USA Science Systems and Applications Inc., Lanham, MD, USA Jet Propulsion Laboratory, Pasadena, CA, USA Royal Netherlands Meteorological Institute (KNMI), de Bilt, The Netherlands 10 07 2009 9 13 4447 4465 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/9/4447/2009/acp-9-4447-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/4447/2009/acp-9-4447-2009.pdf

Estimates of the radiative forcing due to anthropogenically-produced tropospheric O<sub>3</sub> 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 O<sub>3</sub> 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 O<sub>3</sub> 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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