AI Article Synopsis
- Total gaseous mercury (TGM) was monitored at Wuzhi mountain from May 2011 to May 2012, showing an average concentration of (1.58 ± 0.71) ng x m(-3), indicating little pollution in the area.
- TGM levels were generally low during summer months but peaked from September 2011 to January 2012, influenced by tropical monsoons.
- The study found a daily pattern in TGM concentrations, with lows in the morning and highs in the evening, affected by mercury transport from mainland China and local weather conditions.
Article Abstract
Total gaseous mercury (TGM) was continuously monitored at Wuzhi mountain (Wuzhishan) using the high-resolution automatic atmospheric mercury vapor analyzer (Tekran 2537B) from May 2011 to May 2012. The annual geometric mean TGM concentration was (1.58 ± 0.71) ng x m(-3), suggesting that the atmosphere was not obviously polluted. The TGM level at WuZhi mountain remained low from June to August in 2011 and from March to May in 2012, while higher values were observed from September in 2011 to January in 2012. Tropical monsoons played an important role in the monthly variation of TGM. TGM concentrations showed a clear diurnal trend with the minimum concentration occurring at 09:00 AM and the peak concentration at 19:00 PM due to the combined impact of the long-range transport of atmospheric mercury and local meteorological conditions. The temporal trend of TGM highlighted the impact of long-range transport from the mainland of China on the distribution of TGM in ambient air at Wuzhi mountain by the results of backward trajectory analysis using HYSPLIT.
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