气态硝酸在钙质山毛榉森林中沉降通量的研究

1987年5月至12月,在联邦德国哥廷根森林中,位于树冠不同高度上完成了气态硝酸浓度分布的测定。同时,还测定了森林中大气扩散参数。用模式计算出气态硝酸的沉降速度和沉降通量。结果表明,气态硝酸沉降通量平均约为26kg HNO₃—N/a·ha,气态硝酸浓度平均约为0.88μgHNO₃—N/m3,夜间浓度下降,43m处(树冠上面)气态硝酸浓度高于33m(树冠中)。在第1至第10个实验里气溶胶中气态硝酸与硝酸盐的比值是0.3,而在第11~14个实验中约为1~3。 

Research on the Deposition Flux of Gaseous Nitric Acid on Calcareous Beech

The concentration distribution of gaseous nitric acid on different heights of canopy had been measured at Gottingen forest from May to December, 1987. The atmospheric diffusion efficiency in the forest was measured simultaneously.The deposition velocity and deposition flux of gaseous nitric acid were calculated using models.The results showed that the average deposition flux of gaseous nitric acid was about 26 kg HNO3-N/a.ha. The average concentration of gaseous nitric acid was about 0.88ug HNO3-N/m3, and descended at night time. The concentrations of gaseous nitric acid on 43m ( or above the canopy ) were higher than on 33m ( in the canopy ). The ratio between gaseous nitric acid and nitrate in aerosol was about 0.3 from the first to 10th experiments and about -3 from 11th- 14th experiments.