Benchmarking Climate Model Top-of-Atmosphere Radiance in the 9.6 Micron Ozone Band Compared to TES and IASI Observations

Thursday, 18 December 2014
Helen Marie Worden1, Kevin W Bowman2, Andrew J Conley1, J F Lamarque1, Drew T Shindell3, Cathy Clerbaux4, Pierre-Francois Coheur5 and Stamatia Doniki5, (1)National Center for Atmospheric Research, Boulder, CO, United States, (2)Jet Propulsion Laboratory, Pasadena, CA, United States, (3)Duke University, Durham, NC, United States, (4)LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales, Paris Cedex 05, France, (5)Université Libre de Bruxelles, Brussels, Belgium
Tropospheric ozone has the third highest radiative forcing (RF) for anthropogenic greenhouse gases since pre-industrial times, but high uncertainties and a large spread in model values remain in the IPCC AR5. These uncertainties, along with studies using climate models and observations of tropospheric ozone and the sensitivity of TOA (top of atmosphere) flux to the vertical distribution of ozone from the Aura-TES instrument, provide motivation to benchmark the model-to-satellite differences in TOA ozone band flux and flux sensitivity. The TOA flux for the 9.6 micron ozone band is a fundamental quantity which is predicted by IPCC chemistry-climate models but has never been tested directly against satellite measurements. The continuation of the TES record of infrared ozone spectra with long-term IASI data will allow accurate predictions of future ozone forcing and an assessment of the feedback from changes in the hydrological cycle on ozone RF.