CLOUD-TO-GROUND LIGHTNING CHARACTERISTICS IN THE AMAZON REGION BETWEEN DRY TO WET SEASON
In the last decade many authors have found evidence on the influence of smoke from fires on the cloud-to-ground (CG) lightning characteristics, both in the lifetime scale of individual storms and on a climatological scale. In general, the observations indicate that the peak current and percentage of positive flashes increase in thunderstorms injected with smoke, while the negative peak current decreases. This article investigates the validity of these findings in thunderstorms injected with large concentrations of smoke from fires in the Amazon region, comparing CG lightning characteristics in the dry (polluted) and wet (clean) seasons, as well as using a new methodology, based on results of a numerical simulation model of atmospheric transport of tracers coupled to a biomass burning emission model. The results confirm the previous findings and, in addition, give a first estimation of the sensitity of these parameters to changes in the smoke concentration.
Widinei A. Fernandes Iara R.C.A. Pinto Osmar Pinto Jr
Brazilian Institute of Space Research (INPE)S(a)o José dos Campos, SP, Brazil
国际会议
第13届国际大气电学会议(The 13th International Conference on Atmospheric Electricity)
北京
英文
2007-08-13（万方平台首次上网日期，不代表论文的发表时间）