Liu Wei-ming, Ma Ming, Wang Ding-yong, Sun Tao, Wei Shi-qiang
Huan Jing Ke Xue. 2016 May 15;37(5):1639-45.
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.
2012年3月至2013年2月期间，在重庆四面山森林自然保护区（中亚热带地区的代表），使用高分辨率自动大气汞蒸气分析仪（Tekran 2537X）对总气态汞（TGM）进行了连续监测。结果表明，监测期间TGM的平均浓度为（2.88±1.54）ng·m⁻³，该浓度远高于北半球的背景TGM浓度，但低于中国其他大多数监测点的浓度。这些结果表明，四面山的TGM水平在区域尺度上仍处于正常范围内，但在全球范围内呈上升趋势。TGM水平呈现出明显的季节变化，顺序为冬季（3.68±2.43）ng·m⁻³＞夏季（3.29±0.79）ng·m⁻³＞春季（2.44±0.69）ng·m⁻³＞秋季（2.13±0.97）ng·m⁻³，且冬季TGM浓度变化幅度更大。TGM浓度的日变化特征为春季夜间较高，而其他季节白天较高。TGM浓度变化与温度和光照强度呈正相关。使用HYSPLIT进行的后向轨迹分析结果表明，四面山TGM的主要来源是当地的煤炭燃烧，印度季风的长距离输送也可能对TGM水平的升高起到作用。
