title: [Variation Characteristics of Total Gaseous Mercury at Simian Mountain Background Station in Mid-subtropical Region].
abstract: Total gaseous mercury (TGM) was continuously monitored at the Simian Mountain Forest Nature Reserve in Chongqing, a representative of the mid-subtropical region, using high-resolution automatic atmospheric mercury vapor analyzer (Tekran 2537X) from March 2012 to February 2013. The results showed that the average concentration of TGM during the monitoring was (2.88 ± 1.54) ng · m⁻³, which was much higher than the background TGM on north hemisphere but lower than those at most of the other monitoring sites in China. These results suggested that the TGM level in Simian Mountain was still in the normal range on regional scale, but had an increasing tendency globally. The TGM level exhibited a distinct seasonal variation, following the order of winter (3.68 ± 2.43) ng · m⁻³ > summer (3.29 ± 0.79) ng · m⁻³ > spring (2.44 ± 0.69) ng · m⁻³ > autumn (2.13 ± 0.97) ng · m⁻³, and the TGM concentration varied to a greater extent in winter. The diurnal variation of TGM concentration characterized as being higher at the nighttime in spring, while higher during the daytime in other seasons. The concentration variation of TGM had a positive correlation to temperature and light intensity. The result of backward trajectory analysis using HYSPLIT showed that the main source of the TGM in Simian Mountain was the local coal combustion, and long distance transportation by the Indian monsoon might also play a role in the increasing TGM level.
authors: Wei-ming
authors: WM
authors: Liu
authors: Ming
authors: M
authors: Ma
authors: Ding-yong
authors: DY
authors: Wang
authors: Tao
authors: T
authors: Sun
authors: Shi-qiang
authors: SQ
authors: Wei
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D003031:Coal; D004784:Environmental Monitoring; D065928:Forests; D005740:Gases / Q000032:analysis; D008628:Mercury / Q000032:analysis*; D012621:Seasons
chemical_list: D000393:Air Pollutants; D003031:Coal; D005740:Gases; D008628:Mercury