Prognostic Ozone in NOGAPS

Douglas Allen

Naval Research Lab, Washington, DC


The Navy Operational Global Atmospheric Prediction System (NOGAPS) uses a zonal mean ozone climatology to assess the radiative effects of ozone in operational forecasts. Current evaluation is underway of a new prognostic ozone capability in a high-altitude (top at 0.005 mb) test version of NOGAPS. Ozone is advected using the model's spectral transport scheme and can be made both photochemically and radiatively active. For the photochemistry, we have been testing different schemes in NOGAPS, including parameterized monthly-mean production and loss from our in-house NRL CHEM2D model and the more sophisticated Cariolle-Déqué scheme, used operationally at ECMWF. We are also planning to implement and evaluate the "cold tracer" scheme for heterogeneous chemistry, which is necessary for producing a realistic ozone hole, and to include photochemically active methane and nitrous oxide. Here we discuss these recent developments and show examples of the ozone forecasts from several test runs. In addition, plans for future assimilation of satellite ozone observations will be discussed, focusing on the NPOESS Ozone Mapping and Profiler Suite (OMPS).