Atmospheric gaseous elemental mercury (GEM) over a coastal/rural site downwind of East China: Temporal variation and long-range transport
Atmospheric gaseous elemental mercury (GEM) over a coastal/rural site downwind of East China: Temporal variation and long-range transport
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中国东部沿海/农村下风处大气气态元素汞（GEM）：时间变化和长距离迁移
DOI：
10.1016/j.atmosenv.2011.02.043
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发表时间：
2011-05
影响因子：
5
通讯作者：
中科院分区：
文献类型：
--
作者：
尽管中国的汞污染问题备受关注，但探索汞在大气中行为的实地研究却很有限。为了研究大气气态元素汞（GEM或Hg(0)）的时间变化和远距离迁移，在中国东部黄海顺风的沿海/农村地区进行了四个不同季节的GEM测量。在整个研究期间（2007 年 7 月至 2009 年 5 月的四个不同时间段），RA-915+ 汞分析仪测量的 GEM 每小时平均浓度为 2.31 ± 0.74 ng m−3，范围为 1.12–7.01 ng m−3。结果显示，季节性变化适中，寒冷季节水平较高（冬季：2.53 ± 0.77 ng m−3，春季：2.34 ± 0.54 ng m−3），暖季水平较低（夏季：2.28 ± 0.82 ng m−3，秋季：2.16 ± 0.84 ng m−3）。在每个活动期间，观察到 GEM 的日变化一致，白天达到峰值，深夜和清晨达到低水平。污染上升和NOAA-HYSPLIT反轨迹模型分析表明，上升的GEM是从中国东部和朝鲜半岛-日本的区域源输送到采样点的。来自东海和东亚大陆大气汞排放强度较低的地区（如俄罗斯东部、内蒙古北部和渤海）的气团GEM水平有所下降。
Although much attention has been paid to the mercury pollution in China, limited field studies have been conducted to explore the atmospheric behavior of mercury. To investigate the temporal variation and long-range transport of atmospheric gaseous elemental mercury (GEM or Hg(0)), the GEM measurements covering four different seasons were performed at a coastal/rural site of the Yellow Sea downwind of East China. Hourly mean concentrations of GEM measured by RA–915+ mercury analyzer over the entire study (four different time periods between July 2007 and May 2009) were 2.31 ± 0.74 ng m−3with a range of 1.12–7.01 ng m−3. The results showed moderate seasonal variations with high levels in cold seasons (winter: 2.53 ± 0.77 ng m−3and spring: 2.34 ± 0.54 ng m−3) and low levels in warm seasons (summer: 2.28 ± 0.82 ng m−3and fall: 2.16 ± 0.84 ng m−3). Over the each campaign a diurnal variation of GEM was observed consistently with peak levels in daytime and low levels in late night and early morning. The pollution rose and NOAA–HYSPLIT back-trajectory model analyses indicated that the elevated GEM was transported to the sampling site from the regional sources of East China and Korea peninsula–Japan. Air masses originated from the East China Sea and the regions of Continental East Asia with low emission strengths of atmospheric mercury (e.g., the east Russia, the north Inner Mongolia and the Bohai Sea) showed the decreased GEM levels.
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DOI：
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期刊：
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