Modelling of the July 10 STERAO storm with the RAMSmodel: Chemical species redistribution including gas phase andaqueous phase chemistry

摘要

The meso-scale RAMS model has been applied to the July 10, 1996,STERAO storm observed in Colorado using an idealized horizon-tally homogeneous sounding with warm bubble initiation. This sim-ulation was done in the framework of the WMO cloud modelingworkshop intercomparison on chemistry transport in deep convec-tion led by Mary Barth. The RAMS model coupled with gas andaqueous chemistry simulates CO and O_3mixing ratios similar toobservations and other models. The anvil area, mass flux, CO flux,and NO_x flux simulated by the RAMS-chemistry model are found tobe within 35% of the values deduced from observations. We furtherexamine the simple parameterization of NO production from light-ning used in the RAMS simulations, which lead to a good agreementbetween computed and observed NO_x fluxes. Moreover, because theRAMS model allows using either single or double moment micro-physical schemes, the impact of the microphysical scheme is exam-ined in terms of chemical species redistribution by the storm. Finally,the effect of gas phase versus aqueous phase chemistry on chemicalspecies redistribution by the storm is also studied.