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

Helen Marie Worden, NSF National Center for Atmospheric Research (NSF NCAR), Atmospheric Chemistry Observations & Modeling Laboratory (ACOM), Boulder, CO, United States, Kevin W Bowman, NASA Jet Propulsion Laboratory, Pasadena, United States, Andrew J Conley, National Center for Atmospheric Research, Atmospheric Chemistry Observations & Modeling, Boulder, CO, United States, J F Lamarque, National Center for Atmospheric Research, Boulder, CO, United States, Drew T Shindell, Duke University, Nicholas School of the Environment, Durham, United States, Cathy Clerbaux, LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, Paris, France, Pierre-Francois Coheur, Université libre de Bruxelles (ULB), Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Brussels, Belgium and Stamatia Doniki, Université Libre de Bruxelles, Brussels, Belgium
Abstract:
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.
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