Gaseous mercury fluxes from the forest floor of the Adirondacks

被引：87

作者：

Choi, Hyun-Deok ^{[1
]}

Holsen, Thomas M. ^{[1
]}

机构：

[1] Clarkson Univ, Dept Civil & Environm Engn, Potsdam, NY 13699 USA

来源：

ENVIRONMENTAL POLLUTION | 2009年 / 157卷 / 02期

基金：

美国国家科学基金会;

关键词：

Mercury emission flux; Dynamic flux chamber (DFC); Empirical model; Mercury mass balance; Forest canopy; TERRESTRIAL BACKGROUND SURFACES; ATMOSPHERIC MERCURY; ELEMENTAL MERCURY; AIR/SURFACE EXCHANGE; CHAMBER MEASUREMENT; EMISSION FLUXES; EASTERN USA; SOILS; PRECIPITATION; MODEL;

D O I：

10.1016/j.envpol.2008.08.020

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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.

引用

页码：592 / 600

页数：9

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