青岛近海秋季生物气溶胶分布特征

Distribution characteristics of bioaerosol in Qingdao coastal region in Fall 2007

生物气溶胶是大气气溶胶的重要组成部分,对生物气溶胶的分布特征进行分析对于了解其对人体健康和大气环境的影响具有重要作用。于2007年9—10月运用安德森6级生物粒子采样器在青岛近海连续采集生物气溶胶样品,探讨陆源和海源细菌及真菌的浓度和粒径分布特征。结果表明,青岛近海生物气溶胶中陆源细菌浓度高于海源细菌,而陆源真菌浓度低于海源真菌,海源菌总数高于陆源菌;陆源和海源细菌及真菌浓度分布表现为上午﹥下午﹥中午。9—10月陆源和海源细菌主要分布在大于2.1μm的粒子中,占总数的80.0%以上,呈偏态分布;9月陆源和海源真菌主要分布在2.1～7.0μm的粒子中,10月陆源和海源真菌主要分布在1.1～4.7μm的粒子中,呈对数正态分布。总体而言,青岛近海生物气溶胶受到陆地与海洋的双重影响,海洋影响更为显著。

Bioaerosol is a significant subgroup of atmospheric aerosols. Statistical characteristics ofbioaerosol is important for better understanding its impact on human health and atmospheric environment. Observed bioaerosol particles were analyzed to investigate concentration and size of terrestrial/marine bacteria/fungi in Qingdao coastal region. The data were collected using a six-stage Andersen sampler from September to October 2007. The bioaerosol in Qingdao coastal region was influenced by both land and ocean. Number of total marine microorganisms was higher than that of total terrestrial microorganisms. Average concentration of terrestrial bacteria was higher than that of marine bacteria, while average concentration of terrestrial fungi was lower than that of marine fungi. For both terrestrial/marine bacteria/fungi, its concentration showed the highest value peak in the morning and lowest value at noon. More than 80.0% of terrestrial and marine bacteria existed in the particles larger than 2.1 μm, following skewness distribution. The terrestrial and marine fungi in September mainly appeared in the particles with 2.1-7.0 μm diameter, while those in October mainly existed in the particles of 1.1--4.7 μm, both following lognonnal distribution.