David Considine (PI)
NASA Langley Research Center
d.b.considine@larc.nasa.gov

Studies of Near Tropopause Ozone, Very Short-Lived Species, and Tropospheric Physical Processes for the Global Modeling Initiative

The Global Modeling Initiative (GMI) is a NASA-led activity to develop state-of-the-art modeling tools for the purpose of quantifying and reducing uncertainties in global atmospheric model results, understanding the coupling between atmospheric composition and climate, and contributing to assessments of the effects of anthropogenic and natural perturbations of atmospheric composition. We propose several investigations in support of these goals, based on our past involvement with GMI, the current needs of the GMI effort, and the interests of the assessment community, the primary customer for GMI results. First, we propose to continue to lead the effort to develop and utilize the GMI combined model of stratospheric and tropospheric chemistry and dynamics, which will enable investigations of the near-tropopause region (NTR) of the atmosphere. We will oversee the implementation and testing of a new photolysis scheme and a new combined chemistry solver, and continue evaluating the characteristics of GMI combined model ozone distributions in the NTR using ozonesonde and satellite observations. Second, we propose to utilize the GMI model to investigate the contribution to stratospheric halogen concentrations from the decay of very short-lived halocarbon source gas species, paying particular attention to the relative importance of the product gas injection (PGI) and source gas injection (SGI) transport pathways and their sensitivity to the meteorological data used to drive the model. Third, we propose to continue providing diagnostic and scientific studies of tropospheric physical processes such as convection and wet scavenging using radionuclide simulations and other tropospheric species, and Fourth we will continue to maintain the current polar stratospheric cloud scheme for the GMI.

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