气候变化领域集成服务门户(CCPortal): Previously unaccounted atmospheric mercury deposition in a midlatitude deciduous forest

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DOI	10.1073/pnas.2105477118
	Previously unaccounted atmospheric mercury deposition in a midlatitude deciduous forest
	Obrist, Daniel; Roy, Eric M.; Harrison, Jamie L.; Kwong, Charlotte F.; Munger, J. William; Moosmueller, Hans; Romero, Christ D.; Sun, Shiwei; Zhou, Jun; Commane, Roisin
通讯作者	Obrist, D (通讯作者)，Univ Massachusetts, Dept Environm Earth & Atmospher Sci, Lowell, MA 01854 USA.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:29
英文摘要	Mercury is toxic to wildlife and humans, and forests are thought to be a globally important sink for gaseous elemental mercury (GEM) deposition from the atmosphere. Yet there are currently no annual GEM deposition measurements over rural forests. Here we present measurements of ecosystem-atmosphere GEM exchange using tower-based micrometeorological methods in a midlatitude hardwood forest. We measured an annual GEM deposition of 25.1 mu g.m(-2) (95% CI: 23.2 to 26.7 1 mu g.m(-2)), which is five times larger than wet deposition of mercury from the atmosphere. Our observed annual GEM deposition accounts for 76% of total atmospheric mercury deposition and also is three times greater than litterfall mercury deposition, which has previously been used as a proxy measure for GEM deposition in forests. Plant GEM uptake is the dominant driver for ecosystem GEM deposition based on seasonal and diel dynamics that show the forest GEM sink to be largest during active vegetation growing periods and middays, analogous to photosynthetic carbon dioxide assimilation. Soils and litter on the forest floor are additional GEM sinks throughout the year. Our study suggests that mercury loading to this forest was underestimated by a factor of about two and that global forests may constitute a much larger global GEM sink than currently proposed. The larger than anticipated forest GEM sink may explain the high mercury loads observed in soils across rural forests, which impair water quality and aquatic biota via watershed Hg export.
关键词	ELEMENTAL MERCURY EXCHANGE FLUXES LITTER METHYLMERCURY PATHWAYS CANOPY REGION VAPOR
英文关键词	dry deposition; mass balance; mercury cycling
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000685038600011
来源期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/255063
作者单位	[Obrist, Daniel; Roy, Eric M.; Romero, Christ D.; Sun, Shiwei; Zhou, Jun] Univ Massachusetts, Dept Environm Earth & Atmospher Sci, Lowell, MA 01854 USA; [Harrison, Jamie L.; Commane, Roisin] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA; [Kwong, Charlotte F.; Commane, Roisin] Columbia Univ, Dept Earth & Environm Sci, New York, NY 10027 USA; [Munger, J. William] Harvard Univ, Harvard John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA; [Moosmueller, Hans] Desert Res Inst, Div Atmospher Sci, Reno, NV 89512 USA; [Sun, Shiwei] Univ Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Obrist, Daniel,Roy, Eric M.,Harrison, Jamie L.,et al. Previously unaccounted atmospheric mercury deposition in a midlatitude deciduous forest[J]. 中国科学院西北生态环境资源研究院,2021,118(29).
APA	Obrist, Daniel.,Roy, Eric M..,Harrison, Jamie L..,Kwong, Charlotte F..,Munger, J. William.,...&Commane, Roisin.(2021).Previously unaccounted atmospheric mercury deposition in a midlatitude deciduous forest.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,118(29).
MLA	Obrist, Daniel,et al."Previously unaccounted atmospheric mercury deposition in a midlatitude deciduous forest".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 118.29(2021).