Gaseous mercury fluxes from the forest floor of the Adirondacks
Gaseous mercury fluxes from the forest floor of the Adirondacks
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DOI：
10.1016/j.envpol.2008.08.020
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发表时间：
2009-02-01
影响因子：
8.9
通讯作者：
Holsen, Thomas M.
中科院分区：
文献类型：
--
作者：
Choi, Hyun-Deok;Holsen, Thomas M.
在2005年和2006年期间，使用聚碳酸酯动态通量箱(DFC)多次测量了来自美国纽约阿迪朗达克山脉森林地面的气态元素汞(Hg-0)通量。汞通量变化范围为-2.5~27.2ngm(-2)h(-1)，并与温度和太阳辐射呈正相关。测得的汞排放通量以春、夏最高，冬季最低。在落叶期，汞排放通量对太阳辐射的依赖性较强，对温度的依赖性较小。在落叶期，由于森林冠层遮蔽了森林地面，汞排放通量相当稳定。开发了两个经验模型来估计每年的He排放量，一个是针对落叶期，另一个是针对落叶期。使用美国环保局的CASTNET气象数据，累积估计的排放通量约为。7.0Mg汞-0m(-2)年(-1年)。(C)2008爱思唯尔有限公司。保留所有权利。
The flux of gaseous elemental mercury (Hg-0) from the forest floor of the Adirondack Mountains in New York (USA) was measured numerous times throughout 2005 and 2006 using a polycarbonate dynamic flux chamber (DFC). The Hg flux ranged between -2.5 and 27.2 ng m(-2) h(-1) and was positively correlated with temperature and solar radiation. The measured Hg emission flux was highest in spring, and summer, and lowest in winter. During leaf-off periods, the Hg emission flux was highly dependent on solar radiation and less dependent on temperature. During leaf-on periods, the Hg emission flux was fairly constant because the forest canopy was shading the forest floor. Two empirical models were developed to estimate yearly He emissions, one for the leaf-off period and one for the leaf-on period. Using the U.S. EPA's CASTNET meteorological data, the cumulative estimated emission flux was approx. 7.0 mu g Hg-0 m(-2) year(-1). (C) 2008 Elsevier Ltd. All rights reserved.