气候变化领域集成服务门户(CCPortal): Mercury Sourcing and Sequestration in Weathering Profiles at Six Critical Zone Observatories

CCPortal

DOI	10.1029/2018GB005974
	Mercury Sourcing and Sequestration in Weathering Profiles at Six Critical Zone Observatories
	Richardson J.B.; Aguirre A.A.; Buss H.L.; Toby O'Geen A.; Gu X.; Rempe D.M.; Richter D.D.B.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1542
结束页码	1555
卷号	32 期号:10
英文摘要	Mercury sequestration in regolith (soils + weathered bedrock) is an important ecosystem service of the critical zone. This has largely remained unexplored, due to the difficulty of sample collection and the assumption that Hg is predominantly sequestered within surface soils (here we define as 0–0.3 m). We measured Hg concentrations and inventories in weathering profiles at six Critical Zone Observatories (CZOs): Boulder Creek in the Front Range of Colorado, Calhoun in the South Carolina Piedmont, Eel River in coastal northern California, Luquillo in the tropical montane forest of Puerto Rico, Shale Hills of the valley and ridges of central Pennsylvania, and Southern Sierra in the Sierra Nevada range of California. Surface soils had higher Hg concentrations than the deepest regolith samples, except for Eel River, which had lower Hg concentrations in surface soils compared to regolith. Using Ti normalization, CZOs with <12% rock-derived Hg (Boulder Creek, Calhoun, and Southern Sierra) had Hg peaks between 1.5 and 8.0 m in depth. At CZOs with >50% rock-derived Hg, Eel River Hg concentrations and pools were greatest at >4.0 m in the weathering profile, while Luquillo and Shale Hills had peaks at the surface that diminished within 1.0 m of the surface. Hg and total organic C were only significantly correlated in regolith at Luquillo and Shale Hills CZOs, suggesting that Hg sorption to organic matter may be less dominant than clays or Fe(II) sulfides in deeper regolith. Our results demonstrate the importance of Hg sequestration in deep regolith, below typical soil sampling depths. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	critical zone; excess mercury; mercury cycling; mercury inventories; regolith; soil
语种	英语
scopus关键词	chemical weathering; concentration (composition); critical analysis; ecosystem service; mercury (element); montane forest; regolith; sampling; soil organic matter; source-sink dynamics; Boulder Creek [Wisconsin]; Calhoun County [Florida]; California; Colorado; Eel River; Florida [United States]; Front Range; New Mexico; Pennsylvania; Piedmont [United States]; Puerto Rico; Rocky Mountains; Shale Hills; Sierra County [New Mexico]; Sierra Nevada [California]; South Carolina; United States; Wisconsin
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129783
作者单位	Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States; Department of Geoscience, University of Massachusetts Amherst, Amherst, MA, United States; School of Earth Sciences, University of Bristol, Bristol, United Kingdom; Department of Land, Air and Water Resources, University of California, Davis, CA, United States; Department of Geosciences, The Pennsylvania State University, University Park, PA, United States; Department of Geosciences, Jackson School of Geosciences, University of Texas Austin, Austin, TX, United States; University Program in Ecology and Nicholas School of Environment, Duke University, Durham, NC, United States
推荐引用方式 GB/T 7714	Richardson J.B.,Aguirre A.A.,Buss H.L.,et al. Mercury Sourcing and Sequestration in Weathering Profiles at Six Critical Zone Observatories[J],2018,32(10).
APA	Richardson J.B..,Aguirre A.A..,Buss H.L..,Toby O'Geen A..,Gu X..,...&Richter D.D.B..(2018).Mercury Sourcing and Sequestration in Weathering Profiles at Six Critical Zone Observatories.Global Biogeochemical Cycles,32(10).
MLA	Richardson J.B.,et al."Mercury Sourcing and Sequestration in Weathering Profiles at Six Critical Zone Observatories".Global Biogeochemical Cycles 32.10(2018).