ESTIMATION OF THE INJECTION HEIGHT OF BIOMASS BURNING EMISSION

摘要

The focus of this study islaidon the relation betweenrnemitted Fire Radiative Power (FRP) and smoke plumernheight. Once validated for different weather conditionsrnand different fire characteristics, such a relation couldrnbe used to set up a parameterization of fire injection inrnglobal atmospheric chemical transport model. The studyrnis based on both numerical simulation and observations.rnThe numerical approach follows a two successive simulationsrnstrategy that first focuseson the study of fire radiation.rnBased on the capability of the WFDS model inrnfire simulation (and validation on prescribed fires), thernmodel is developed to calculate fire radiation in the middlerninfra red. The partitioning of the emitted energy betweenrndifferent processes such as radiation and convectionrnis also studied. The second step simulation is basedrnon the plume model developed by Freitas et al. (2007).rnThis plume model is already used in different host models(rne.g. WRF, BRAMS). In its current version, the firernis modeled by: a convective heat flux (pre-defined byrnthe land cover and evaluated as a fixed part of the totalrnheat released); and a plume radius which defines the firernextension where the FRP is homogeneously distributed.rnHere in our approach the Freitas model is modified to usernresults based on WFDS simulation and observations, torndirectly force the convective heat flux from FRP data.rnValidation of this new initialization method is shown byrncomparing Freitas 1D plume model with MISR data forrnseveral test case fires.