The distribution of gaseous elemental mercury (GEM)was determined in the surface atmosphere of the northern South China Sea(SCS) during 12 SEATS cruises between May 2003 and December 2005. The samplingand analysis of GEM were performed on board ship by using an on-line mercuryanalyzer (GEMA). Distinct annual patterns were observed for the GEM with awinter maximum of 5.7 ± 0.2 ng m ( = 3) and minimum in summer(2.8 ± 0.2; = 3), with concentrations elevated 2–3 times globalbackground values. Source tracking through backward air trajectory analysisdemonstrated that during the northeast monsoon (winter), air masses camefrom Eurasia, bringing continental- and industrial-derived GEM to the SCS.In contrast, during summer southwest monsoon and inter-monsoon, air masseswere from the Indochina Peninsula and Indian Ocean and west Pacific Ocean.This demonstrates the impact that long-range transport, as controlled byseasonal monsoons, has on the Hg atmospheric distribution and cycling in theSCS.
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机译：在2003年5月至2005年12月的12次SEATS航行中，确定了南海北部（SCS）表层大气中的气态元素汞（GEM）的分布。GEM的采样和分析是通过以下方法在船上进行的：线汞分析仪（GEMA）。观察到的GEM有不同的年度模式，冬季最大值为5.7±0.2 ng m（= 3），夏季最小值（2.8±0.2; = 3），其浓度升高了全球本底值的2-3倍。通过反向空气轨迹分析进行的源跟踪表明，在东北季风（冬季）期间，空气团来自欧亚大陆，将大陆和工业衍生的GEM带入了南海，而在夏季西南季风和季风之间，气团来自印度支那半岛，印度洋和西太平洋。这证明了受季节性季风控制的远距离运输对SCS中汞的大气分布和循环的影响。
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