title: CO2 absorption/emission and aerodynamic effects of trees on the concentrations in a street canyon in Guangzhou, China.
abstract: In this paper, the effects of trees on CO2 concentrations in a street canyon in Guangzhou, China are examined by Computational Fluid Dynamics (CFD) simulations of the concentration distribution, taking into account both the CO2 absorption/emission and aerodynamic effects of trees. Simulation results show that, under a 2 m/s southerly prevailing wind condition, CO2 absorption by trees will reduce the CO2 concentration by around 2.5% in the daytime and at the same time the trees' resistance will increase the difference of CO2 concentrations in the street and at the inflow by 43%. As the traffic density increases to 50 vehicles/min, the effect of trees on the ambient CO2 concentration will change from positive to negative. At night, trees have a negative effect on the concentration in the street canyon mainly because of their resistance to airflow. When environmental wind changes, the effect of trees will be different.
authors: Dept. of Applied Mechanics and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
authors: Jian-Feng
authors: JF
authors: Li
authors: Jie-Min
authors: JM
authors: Zhan
authors: Y S
authors: YS
authors: Li
authors: Onyx W H
authors: OW
authors: Wai
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D001336:Automobiles; D057486:Carbon Cycle; D002245:Carbon Dioxide / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring; D008956:Models, Chemical; D014197:Trees / Q000737:chemistry*; D014919:Wind
chemical_list: D000393:Air Pollutants; D002245:Carbon Dioxide