globalchange  > 气候减缓与适应
DOI: 10.1038/s41561-018-0078-8
论文题名:
A vegetation control on seasonal variations in global atmospheric mercury concentrations
作者: Jiskra M.; Sonke J.E.; Obrist D.; Bieser J.; Ebinghaus R.; Myhre C.L.; Pfaffhuber K.A.; Wängberg I.; Kyllönen K.; Worthy D.; Martin L.G.; Labuschagne C.; Mkololo T.; Ramonet M.; Magand O.; Dommergue A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期:4
起始页码: 244
结束页码: 250
语种: 英语
英文摘要: Anthropogenic mercury emissions are transported through the atmosphere as gaseous elemental mercury (Hg(0)) before they are deposited to Earth's surface. Strong seasonality in atmospheric Hg(0) concentrations in the Northern Hemisphere has been explained by two factors: anthropogenic Hg(0) emissions are thought to peak in winter due to higher energy consumption, and atmospheric oxidation rates of Hg(0) are faster in summer. Oxidation-driven Hg(0) seasonality should be equally pronounced in the Southern Hemisphere, which is inconsistent with observations of constant year-round Hg(0) levels. Here, we assess the role of Hg(0) uptake by vegetation as an alternative mechanism for driving Hg(0) seasonality. We find that at terrestrial sites in the Northern Hemisphere, Hg(0) co-varies with CO2, which is known to exhibit a minimum in summer when CO2 is assimilated by vegetation. The amplitude of seasonal oscillations in the atmospheric Hg(0) concentration increases with latitude and is larger at inland terrestrial sites than coastal sites. Using satellite data, we find that the photosynthetic activity of vegetation correlates with Hg(0) levels at individual sites and across continents. We suggest that terrestrial vegetation acts as a global Hg(0) pump, which can contribute to seasonal variations of atmospheric Hg(0), and that decreasing Hg(0) levels in the Northern Hemisphere over the past 20 years can be partly attributed to increased terrestrial net primary production. © 2018 The Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105583
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Géosciences Environnement Toulouse, Centre National de la Recherche Scientifique, Lnstitut de Recherche Pour le Développement, Université de Toulouse, Toulouse, France; Environmental Geosciences, University of Basel, Basel, Switzerland; Department of Environmental Earth, and Atmospheric Sciences, University of Massachusetts, Lowell, MA, United States; Institute of Coastal Research, Helmholtz Zentrum Geesthacht, Geesthacht, Germany; Norwegian Institute for Air Research, Kjeller, Norway; Swedish Environmental Research Institute, Gothenburg, Sweden; Atmospheric Composition Research Unit, Finnish Meteorological Institute, Helsinki, Finland; Climate Research Division, Environment and Climate Change Canada, Toronto, Canada; Cape Point Global Atmosphere Watch Station, South African Weather Service, Stellenbosch, South Africa; Laboratoire des Sciences du Climat et de l'Environnement, Institut Pierre Simon Laplace, Université Paris-Saclay, Gif Sur Yvette, France; Institut des Géosciences de l'Environnement, Université Grenoble Alpes, Centre National de la Recherche Scientifique, Lnstitut de Recherche Pour le Développement, Grenoble, France

Recommended Citation:
Jiskra M.,Sonke J.E.,Obrist D.,et al. A vegetation control on seasonal variations in global atmospheric mercury concentrations[J]. Nature Geoscience,2018-01-01,11(4)
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