Dynamic Oxidation of Gaseous Mercury in the Arctic Troposphere at Polar Sunrise
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- 作者：Steve E. Lindberg ; Steve Brooks ; C.-J. Lin ; Karen J. Scott ; Matthew S. Landis ; Robert K. Stevens ; Mike Goodsite ; and Andreas Richter
- 刊名：Environmental Science & Technology
- 出版年：2002
- 出版时间：March 15, 2002
- 年：2002
- 卷：36
- 期：6
- 页码：1245 - 1256
- 全文大小：1580K
- 年卷期：v.36,no.6(March 15, 2002)
- ISSN：1520-5851
文摘
Gaseous elemental mercury (Hg0) is a globally distributedair toxin with a long atmospheric residence time. Anyprocess that reduces its atmospheric lifetime increasesits potential accumulation in the biosphere. Our data fromBarrow, AK, at 71
N show that rapid, photochemicallydriven oxidation of boundary-layer Hg0 after polar sunrise,probably by reactive halogens, creates a rapidly depositingspecies of oxidized gaseous mercury in the remote Arctictroposphere at concentrations in excess of 900 pg m-3.This mercury accumulates in the snowpack during polarspring at an accelerated rate in a form that is bioavailableto bacteria and is released with snowmelt during thesummer emergence of the Arctic ecosystem. Evidencesuggests that this is a recent phenomenon that may beoccurring throughout the earth's polar regions.
N show that rapid, photochemicallydriven oxidation of boundary-layer Hg0 after polar sunrise,probably by reactive halogens, creates a rapidly depositingspecies of oxidized gaseous mercury in the remote Arctictroposphere at concentrations in excess of 900 pg m-3.This mercury accumulates in the snowpack during polarspring at an accelerated rate in a form that is bioavailableto bacteria and is released with snowmelt during thesummer emergence of the Arctic ecosystem. Evidencesuggests that this is a recent phenomenon that may beoccurring throughout the earth's polar regions.