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DOI	10.1007/s10533-020-00671-w
	Natural atmospheric deposition of molybdenum: a global model and implications for tropical forests
	Wong M.Y.; Mahowald N.M.; Marino R.; Williams E.R.; Chellam S.; Howarth R.W.
发表日期	2020
ISSN	0168-2563
起始页码	159
结束页码	174
卷号	149 期号:2
英文摘要	Molybdenum (Mo) is an essential trace metal that plays a central role in biological nitrogen fixation (BNF) as the cofactor in the conventional form of the nitrogenase enzyme. The low availability of Mo in soils often constrains BNF in many terrestrial ecosystems. Atmospheric sources may supply a critical source of exogenous Mo to regions with highly weathered soils likely low in Mo, particularly in tropical forests where BNF is thought to be high. Here, we present results of a global model of Mo deposition that considers the principal natural sources of atmospheric Mo—windborne mineral dust, sea-salt aerosols, and volcanic sources—which operate over geologic time. The largest source of mineral dust globally is from North Africa. We quantified Mo concentrations in dust and sediments from the Bodélé Depression, a large source within North Africa, to constrain our model. Because the Mo concentration of seawater is relatively high for a trace element, we also hypothesized that sea-salt aerosols would contribute atmospheric Mo. Our model predicts higher Mo deposition to terrestrial ecosystems along coasts downstream in trade winds, near active volcanoes, and in areas that receive dust deposition from North Africa, such as the northern Amazon Basin, the Caribbean, and Central America. Regions with higher Mo deposition tend to be areas where BNF has previously been measured. The lowest Mo deposition occurs in the high latitudes, northern parts of North America, Western Australia, Southern Africa, and much of central South America. Atmospheric transport of Mo likely plays an important role in supplying Mo to ecosystems across geologic time, particularly in regions with highly weathered soils. © 2020, Springer Nature Switzerland AG.
英文关键词	Amazon basin; Atmospheric dust; Bodélé depression; Nitrogen fixation; Saharan dust; Sahel region; Sea-salt aerosols; Tropical forests
语种	英语
scopus关键词	aerosol; atmospheric deposition; atmospheric transport; enzyme; global perspective; mineral dust; molybdenum; nitrogen fixation; pollutant source; sea salt; terrestrial ecosystem; trace metal; tropical forest; Amazon Basin; Australia; Bodele; Central America; Chad; North Africa; North America; South America; Southern Africa; Western Australia
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153137
作者单位	Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, United States; Cary Institute of Ecosystem Studies, Millbrook, NY 12545, United States; Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14853, United States; Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Department of Civil and Environmental Engineering, Texas A&M University, College Station, TX 77843, United States
推荐引用方式 GB/T 7714	Wong M.Y.,Mahowald N.M.,Marino R.,et al. Natural atmospheric deposition of molybdenum: a global model and implications for tropical forests[J],2020,149(2).
APA	Wong M.Y.,Mahowald N.M.,Marino R.,Williams E.R.,Chellam S.,&Howarth R.W..(2020).Natural atmospheric deposition of molybdenum: a global model and implications for tropical forests.Biogeochemistry,149(2).
MLA	Wong M.Y.,et al."Natural atmospheric deposition of molybdenum: a global model and implications for tropical forests".Biogeochemistry 149.2(2020).