Oxidation of gaseous elemental mercury to gaseous divalent mercury during 2003 polar sunrise at Ny-Alesund.
Oxidation of gaseous elemental mercury to gaseous divalent mercury during 2003 polar sunrise at Ny-Alesund.
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DOI：
10.1021/es050965o
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发表时间：
2005-10
影响因子：
11.4
通讯作者：
F. Sprovieri;N. Pirrone;M. Landis;R. Stevens
中科院分区：
文献类型：
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作者：
F. Sprovieri;N. Pirrone;M. Landis;R. Stevens
春季现象被称为汞耗竭事件（MDE），在此期间，元素气态汞（Hg 0）可能转化为在极地生态系统中积累的反应形式，首先在北极发现，现在已在两极观察到，并导致大气汞的重要去除途径。2003年4月19日至5月13日，在斯匹次卑尔根岛的Ny-Alesund进行了一次密集的国际春季汞实验，以研究北极环境中的大气汞化学，特别是极地日出后北极边界层中发生的MDE。在齐柏林山站（ZMS）对汞0、二价活性气态汞（RGM）和细颗粒汞（<2.5微米）（Hg（p））进行了自动环境测量。在实验期间，整个春季低层大气中的汞浓度与臭氧水平同步变化。在第一次和主要的MDE期间，Hg 0浓度范围从背景水平（约1.6 ng m（-3））到无法检测的值（<0.1 ng m（-3）），而RGM数据在采样期间显示出相反的趋势，浓度急剧增加至230 pg m（-3）的峰值，与Hg 0的耗尽同步。气象迁移分析的结果表明，在ZMS观测到的MDE主要是由于空气质量从北冰洋的开放水域输送进来，这些区域在到达时已经耗尽了Hg 0，而不是由于原位氧化机制。
The springtime phenomenon, termed as the mercury depletion event (MDE), during which elemental gaseous mercury (Hg0) may be converted to a reactive form that accumulates in polar ecosystems, first noted in the Arctic, has now been observed at both poles and results in an important removal pathway for atmospheric mercury. An intensive international springtime mercury experiment was performed at Ny-Alesund, Spitsbergen, from 19 April to 13 May 2003 to study the atmospheric mercury chemistry in the Arctic environment and, in particular, the MDEs which occurred in the arctic boundary layer after polar sunrise. Automated ambient measurements of Hg0, divalent reactive gaseous mercury (RGM) and fine particulate mercury (<2.5 microm) (Hg(p)) were made at the Zeppelin Mountain Station (ZMS). During the experiment mercury concentrations in the lower atmosphere varied in synchrony with ozone levels throughout the Spring. Hg0 concentrations ranged from background levels (approximately 1.6 ng m(-3)) to undetectable values (<0.1 ng m(-3)) during the first and major MDE, while RGM data showed an opposite trend during the sampling period with concentrations increasing dramatically to a peak of 230 pg m(-3), synchronous with the depletion of Hg0. The results of a meteorological transport analysis indicate the MDEs observed at ZMS were primarily due to air masses being transported in from open water areas in the Arctic Ocean that were already depleted of Hg0 when they arrived and not due to in-situ oxidation mechanisms.