Improvement in two aspects is done of the one-level mesoscale numerical model of Mass et al.(1985)and the re- vised model is used to make a simulation of a severe convective weather process in North China,with the res...Improvement in two aspects is done of the one-level mesoscale numerical model of Mass et al.(1985)and the re- vised model is used to make a simulation of a severe convective weather process in North China,with the result showing the pronounced effects of the topography upon the mesoscale systems.展开更多
[Objective] The aim was to research application of revised puff trajectory model in atmospheric environmental risks simulation.[Method] In the research,theory of puff trajectory model for pollution diffusion in atmosp...[Objective] The aim was to research application of revised puff trajectory model in atmospheric environmental risks simulation.[Method] In the research,theory of puff trajectory model for pollution diffusion in atmosphere in urban areas was analyzed and CALPUFF,a revised puff trajectory model,was applied in prediction on atmospheric environmental risks in Xining City.[Result] The simple puff trajectory model can not be applied for long-distance transport or in complex terrain and airflow field.In contrast,CALPUFF would be applied in urban areas,and complex terrain or underlying surface.With high resolution ratio,it would depict the beginning condition and detailed distribution of pollutants transport and diffusion.For prediction on atmospheric environmental risks in Xining City,northwest wind dominated in Huangshui Valley;north wind dominated in Beichuan Valley;temperature inversion occurred at high altitude.These had a significant effect on the downwind direction in Xining urban district.The simulation results indicated that puffs usually spread along Huangshui Valley and some non-steady phenomena occurred,such as blocking effect by mountains,deformation of puff by airflow field in ridges and influence of valley wind.[Conclusion] The research is of significance for precise prediction on characters,influence and extent of atmospheric environmental risks in cities.展开更多
基金supported by the National Natural Science Foundation of China
文摘Improvement in two aspects is done of the one-level mesoscale numerical model of Mass et al.(1985)and the re- vised model is used to make a simulation of a severe convective weather process in North China,with the result showing the pronounced effects of the topography upon the mesoscale systems.
文摘[Objective] The aim was to research application of revised puff trajectory model in atmospheric environmental risks simulation.[Method] In the research,theory of puff trajectory model for pollution diffusion in atmosphere in urban areas was analyzed and CALPUFF,a revised puff trajectory model,was applied in prediction on atmospheric environmental risks in Xining City.[Result] The simple puff trajectory model can not be applied for long-distance transport or in complex terrain and airflow field.In contrast,CALPUFF would be applied in urban areas,and complex terrain or underlying surface.With high resolution ratio,it would depict the beginning condition and detailed distribution of pollutants transport and diffusion.For prediction on atmospheric environmental risks in Xining City,northwest wind dominated in Huangshui Valley;north wind dominated in Beichuan Valley;temperature inversion occurred at high altitude.These had a significant effect on the downwind direction in Xining urban district.The simulation results indicated that puffs usually spread along Huangshui Valley and some non-steady phenomena occurred,such as blocking effect by mountains,deformation of puff by airflow field in ridges and influence of valley wind.[Conclusion] The research is of significance for precise prediction on characters,influence and extent of atmospheric environmental risks in cities.
