中文摘要：

硝酸（HNO3）、亚硝酸（HNO2）和氨气（NH3）是大气中重要的含氮化合物,不仅影响大气的光化学氧化能力和酸碱性,还在大气氮沉降中有重要贡献.利用2012年5月4—13日在青岛采集的denuder大气样品,分析了其中HNO3、HNO2和NH3的浓度.青岛大气中HNO3、HNO2和NH3浓度分别为0.88~6.15μg·m-3、0.07~2.02μg·m-3和0.47~7.87μg·m-3,平均分别为2.06μg·m-3、0.92μg·m-3和3.03μg·m-3.大气中3种气体浓度的昼夜变化均无显著性差异.平行采集的样品分析结果显示：denuder涂层的差异对HNO3和NH3的观测结果影响较小,但对HNO2的影响较大,且高温天气易于造成HNO2更大的观测误差.青岛大气中HNO3浓度与温度呈正相关、与湿度呈负相关关系,高温低湿天气时样品中HNO3的浓度一般较高,而高湿或降雨天气时的浓度则较低.NH3浓度与风向呈显著相关关系,主要受局地一次排放源的影响,NH4NO3和NH4NO2分解对青岛大气中NH3的贡献小于23%.青岛大气样品中NH3的浓度在阵雨时以受土壤释放的影响为主,浓度较高;而连续降雨时则以受湿清除作用的影响为主,浓度较低.

英文摘要：

Nitric acid （HNO3 ）, nitrous acid （HNO2 ） and ammonia （NH3 ） are important reactive nitrogen compounds in the atmosphere. These acidic and basic gases could influence atmospheric photochemical oxidation capacity and change the extent of acidity of atmospheric aerosols, and further contribute to atmospheric nitrogen deposition. Gas samples were continuously collected using denuders in Qingdao from 4 to 13 May in 2012. Concentrations of HNO3 , HNO2 and NH3 were in the range of 0.88 -6.15 μg·m-3 , 0.07 -2.02 μg·m-3 and 0.47 -7.87μg·m-3 , with a mean value of 2.06 μg·m-3, 0. 92 μg·m-3 and 3.03 μg·m-3, respectively. No statistically significant differences were observed between daytime and nighttime concentrations of these species. The results of parallel samples showed that artifact reactions had little influence on the measured concentrations of HNO3 and NH3 , but had an important influence on the measured vales of HNO2. High temperature apparently increased the sampling artifact of HNO2. The concentration of HNO3 had a positive correlation with temperature, and a negative correlation with relative humidity. High relative humidity and rainfall enhanced wet deposition of I-INO3 in the atmosphere. The concentration of NH3 correlated well with wind direction. The results suggested that the main sources of NH3 were from local emissions, less than 23% from dissociation of NH4 NO3 and NH4 NO2. When there was a shower, the concentration of NH3 increased because of the enhancement of soil release, but when the rainfall was continuous, the concentration of NH3 decreased because of wet deposition.