格尔木地区沙尘气溶胶硝酸盐含量及来源  

The Concentrations and Sources of Nitrate in Aerosol over Golmud,Qinghai,China

作　　者：盛阳[1] 杨胜利[2,1] 韩永翔[3] 郑秋凤[1] 方小敏[4] 

机构地区：[1]南京师范大学地理科学学院/江苏省环境演变与生态建设重点实验室实验室,江苏南京210023 [2]兰州大学西部环境教育部重点实验室/资源环境学院,甘肃兰州730000 [3]南京信息工程大学大气物理学院,江苏南京210044 [4]中国科学院青藏高原研究所,北京100101

出　　处：《中国沙漠》2016年第3期792-797,共6页Journal of Desert Research

基　　金：国家自然科学基金项目(40972122);江苏高校优势学科建设工程项目

摘　　要：沙尘气溶胶中硝酸盐的含量和来源对于全球氮排放估算具有重要意义。为了探讨格尔木沙尘气溶胶中硝酸盐的含量和来源,我们在格尔木2008年沙尘过程多发期1—6月进行了连续观测,并对收集的沙尘气溶胶样品进行了详细的水溶性离子色谱分析。结果显示:沙尘天气的大气总悬浮颗粒物(TSP)平均浓度及NO_3^-平均浓度分别为2 015.94μg·m^(-3)和1.8μg·m^(-3),非沙尘天气两者平均浓度分别为274.68μg·m^(-3)和0.74μg·m^(-3)。观测期间,格尔木NO_3^-浓度和TSP浓度存在明显的季节变化,NO_3^-和TSP浓度变化均为春季>夏季>冬季。TSP与NO_3^-浓度的相关系数为0.67,春季两者相关系数为0.71,且Ca^(2+)与NO_3^-浓度显著相关,推测格尔木沙尘气溶胶中NO_3^-离子可能主要来源于干旱区的地表物质。非沙尘天气期间NO_3^-/TSP浓度比值高于沙尘天气,且分布较为分散,表明非沙尘天气NO_3^-浓度受到人为源或气象条件的影响。The study of particulate nitrate in the ambient air in continental area is of great importance to estimate the global nitrogen emission.To investigate the concentrations and sources of particulate nitrate in aerosol in the northern Tibetan Plateau,the water soluble（WS）nitrates were analyzed by ion chromatography for total suspended particulate（TSP）collected in Golmud from January to June,2008.The average concentrations of TSP and the WS NO_3^-are 2 015.94μg·m^（-3） and 1.8μg·m^（-3） under dust condition,with 274.68μg·m^（-3）and 0.74μg·m^（-3）under non-dust condition,respectively.The concentrations of TSP and the WS NO_3^-show distinctive seasonal variations with a trend of spring〉summer〉winter.The correlation of the WS NO_3^-and TSP are quite obvious with a coefficient of r=0.67 for all samples and r=0.71 for the samples of spring in2008.And the concentrations of NO_3^-have significant correlation with Ca2＋.Thus we infer that the dust processes have mainly effects on the concentrations of the WS NO_3^-,and the surface soil should be the main sources for particulate nitrate.The ratios of NO_3^-/TSP are higher in dust samples than that of in non-dust samples,and the ratioes are scattered in non-dust samples.It indicates that the WS NO_3^-may mainly be affected by anthropogenic sources and local weather in non-dust conditions in Goumud.

关 键 词：沙尘气溶胶 离子分析 硝酸盐 格尔木 

分 类 号：O648.18[理学—物理化学]