| DOI: | 10.1002/2014GL062234
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| 论文题名: | Enhanced removal of groundwater-borne nitrate in heterogeneous aquatic sediments |
| 作者: | Sawyer A.H.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9029
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| EISSN: | 1944-8760
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| 出版年: | 2015
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| 卷: | 42, 期:2 | | 起始页码: | 403
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| 结束页码: | 410
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| 语种: | 英语
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| 英文关键词: | denitrification
; heterogeneity
; hyporheic
; nitrogen
; surface water-groundwater interactions
; water quality
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| Scopus关键词: | Agglomeration
; Denitrification
; Groundwater
; Nitrates
; Nitrogen
; Organic carbon
; Oxic sediments
; Sediments
; Silt
; Surface waters
; Travel time
; Water quality
; Aerobic respiration
; Coastal water quality
; Heterogeneity
; Hyporheic
; Organic carbon contents
; Reactive transport
; Soils and sediments
; Surface water-groundwater interaction
; Nitrogen removal
; anthropogenic effect
; aquatic ecosystem
; denitrification
; groundwater
; heterogeneity
; infill
; nitrate
; nutrient enrichment
; reactive transport
; travel time
; water quality
|
| 英文摘要: | Anthropogenic nitrate loads to rivers and coasts deteriorate coastal water quality. The primary sink for nitrate is denitrification in aquatic sediments. Here I show that nitrate removal rates in upwelling groundwater are as much as 60 times more efficient in heterogeneous than equivalent homogeneous aquatic sediments, even when travel times are the same. Coupled flow and reactive transport simulations were used to quantify the removal of groundwater-borne nitrate in aquatic sediments with sand and silt structures that represent infilled burrows, rip-up clasts, or other core-scale features. In silt structures with greater organic carbon content and microbial biomass, aerobic respiration consumes oxygen, creating localized zones of denitrification that would not otherwise exist in homogeneous sediments. While hot spots of denitrification have previously been shown to form in organic-rich aggregates in soils and sediments, this study is the first to quantify their potentially large influence on groundwater-borne nitrate loads to surface waters. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923599378&doi=10.1002%2f2014GL062234&partnerID=40&md5=23292678164090233eac8def0bbf5442
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8645
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | School of Earth Sciences, Ohio State University, Columbus, OH, United States
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| Recommended Citation: | |
Sawyer A.H.. Enhanced removal of groundwater-borne nitrate in heterogeneous aquatic sediments[J]. Geophysical Research Letters,2015-01-01,42(2).
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