Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR019724 |
Snowmelt controls on concentration-discharge relationships and the balance of oxidative and acid-base weathering fluxes in an alpine catchment, East River, Colorado | |
Winnick, Matthew J.1; Carroll, Rosemary W. H.2; Williams, Kenneth H.3,4; Maxwell, Reed M.5; Dong, Wenming3; Maher, Kate1 | |
2017-03-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Although important for riverine solute and nutrient fluxes, the connections between biogeochemical processes and subsurface hydrology remain poorly characterized. We investigate these couplings in the East River, CO, a high-elevation shale-dominated catchment in the Rocky Mountains, using concentration-discharge (C-Q) relationships for major cations, anions, and organic carbon. Dissolved organic carbon (DOC) displays a positive C-Q relationship with clockwise hysteresis, indicating mobilization and depletion of DOC in the upper soil horizons and emphasizing the importance of shallow flow paths during snowmelt. Cation and anion concentrations demonstrate that carbonate weathering, which dominates solute fluxes, is promoted by both sulfuric acid derived from pyrite oxidation in the shale bedrock and carbonic acid derived from subsurface respiration. Sulfuric acid weathering dominates during base flow conditions when waters infiltrate below the inferred pyrite oxidation front, whereas carbonic acid weathering plays a dominant role during snowmelt as a result of shallow flow paths. Differential C-Q relationships between solutes suggest that infiltrating waters approach calcite saturation before reaching the pyrite oxidation front, after which sulfuric acid reduces carbonate alkalinity. This reduction in alkalinity results in CO2 outgassing when waters equilibrate to surface conditions, and reduces the riverine export of carbon and alkalinity by roughly 33% annually. Future changes in snowmelt dynamics that control the balance of carbonic and sulfuric acid weathering may substantially alter carbon cycling in the East River. Ultimately, we demonstrate that differential C-Q relationships between major solutes can provide unique insights into the complex subsurface flow and biogeochemical dynamics that operate at catchment scales. |
英文关键词 | concentration-discharge critical zone pyrite oxidation |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000400160500042 |
WOS关键词 | DISSOLVED ORGANIC-CARBON ; FORESTED HEADWATER CATCHMENT ; MODELING TRANSPORT ; SULFIDE OXIDATION ; CLIMATE-CHANGE ; WATER ; SOIL ; STREAM ; CO2 ; HYSTERESIS |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/20016 |
专题 | 资源环境科学 |
作者单位 | 1.Stanford Univ, Dept Geol Sci, Stanford, CA 94305 USA; 2.Desert Res Inst, Div Hydrol Sci, Reno, NV USA; 3.Lawrence Berkeley Natl Lab, Berkeley, CA USA; 4.Rocky Mt Biol Labs, Crested Butte, CO USA; 5.Colorado Sch Mines, Hydrol Sci & Engn Program, Golden, CO 80401 USA |
推荐引用方式 GB/T 7714 | Winnick, Matthew J.,Carroll, Rosemary W. H.,Williams, Kenneth H.,et al. Snowmelt controls on concentration-discharge relationships and the balance of oxidative and acid-base weathering fluxes in an alpine catchment, East River, Colorado[J]. WATER RESOURCES RESEARCH,2017,53(3). |
APA | Winnick, Matthew J.,Carroll, Rosemary W. H.,Williams, Kenneth H.,Maxwell, Reed M.,Dong, Wenming,&Maher, Kate.(2017).Snowmelt controls on concentration-discharge relationships and the balance of oxidative and acid-base weathering fluxes in an alpine catchment, East River, Colorado.WATER RESOURCES RESEARCH,53(3). |
MLA | Winnick, Matthew J.,et al."Snowmelt controls on concentration-discharge relationships and the balance of oxidative and acid-base weathering fluxes in an alpine catchment, East River, Colorado".WATER RESOURCES RESEARCH 53.3(2017). |
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