The Concentrations and Sources of Nitrate in Aerosol over Golmud, Qinghai, China
Received date: 2015-01-09
Revised date: 2015-02-11
Online published: 2016-05-20
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 NO3- are 2 015.94 μg·m-3 and 1.8 μg·m-3 under dust condition, with 274.68 μg·m-3 and 0.74 μg·m-3 under non-dust condition, respectively. The concentrations of TSP and the WS NO3- show distinctive seasonal variations with a trend of spring>summer>winter. The correlation of the WS NO3- and TSP are quite obvious with a coefficient of r=0.67 for all samples and r=0.71 for the samples of spring in 2008. And the concentrations of NO3- have significant correlation with Ca2+. Thus we infer that the dust processes have mainly effects on the concentrations of the WS NO3-, and the surface soil should be the main sources for particulate nitrate. The ratios of NO3-/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 NO3- may mainly be affected by anthropogenic sources and local weather in non-dust conditions in Goumud.
Key words: dust aerosol; ionic analysis; nitrate; Golmud
Sheng Yang , Yang Shengli , Han Yongxiang , Zheng Qiufeng , Fang Xiaomin . The Concentrations and Sources of Nitrate in Aerosol over Golmud, Qinghai, China[J]. Journal of Desert Research, 2016 , 36(3) : 792 -797 . DOI: 10.7522/j.issn.1000-694X.2015.00054
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