Abstract ID: 508

Including the environmental wind effect on cloud scale dilution and the final injection layer of pyro-cumulus.

We describe a parameterization to include the environmental wind effect on the vertical transport of hot gases and particles emitted from biomass burning in low resolution atmospheric-chemistry transport models. This sub-grid transport mechanism is simulated by embedding a 1D cloud-resolving model with appropriate lower boundary conditions in each column of the 3D host model. Through assimilation of remote sensing fire products, we recognize which columns have fires. Using a land use dataset appropriate fire properties are selected. The host model provides the environmental conditions, allowing the plume rise to be simulated explicitly. The role of horizontal environment wind effect on the pyro-cumulus cloud scale in the 1D model is included defining a 'collisional' entrainment in the governing equations. We show that this effect is more pronounced for small fires and windy environment and might help the transport models get better results for the injection layers associated with savanna/pasture fires. Preliminary results of this effect on the long range transport of biomass burning as well as on its vertical distribution are discussed.

Session:  Biogeochemistry - Sources, sinks, and atmospheric chemistry of trace gases.

Presentation Type:  Poster