Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR020500 |
Dynamics of nitrate concentration-discharge patterns in an urban watershed | |
Duncan, Jonathan M.1,2; Welty, Claire3,4; Kemper, John T.3,4; Groffman, Peter M.5,6; Band, Lawrence E.1,7,8,9 | |
2017-08-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Concentration-discharge (c-Q) relations have been used to infer watershed-scale processes governing solute fluxes. Prior studies have documented inconsistent concentration-discharge patterns at the storm-event scale driven by changes in end-member concentrations. Other studies have evaluated c-Q data from all periods in a composite fashion to quantify chemostasis (relatively invariant changes in concentration over several orders of magnitude variation in streamflow). Here we examine 3 years of high-frequency nitrate and discharge data (49,861 data points) to complement 14 years of weekly data (699 data points) for an urban stream in Baltimore, MD, U.S. to quantify c-Q relationships. We show that these relationships are variable through time and depend on the temporal scale at which they are investigated. On a storm-event scale, the sensor data exhibit a watershed-specific dQ/Q threshold when storms switch from counter-clockwise to clockwise c-Q behavior. On a seasonal scale, we show the influence of hydrologic variability and in-stream metabolism as controls on stream nitrate concentrations and fluxes. On a composite scale, we evaluate the c-Q data for chemostasis using analysis of both c-Q slopes and CVc/CVQ, as a function of time. The slopes of c-Q data for both long-term weekly and high-frequency data sets are in close agreement on an annual basis and vary between dry and wet years; the CVc/CVQ analysis is less sensitive to hydroclimate variability. This work highlights the value of both long-term and high-frequency c-Q data collection for calculating and analyzing solute fluxes. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000411202000053 |
WOS关键词 | HIGH-FREQUENCY WAVE ; CATCHMENT SCALE ; NITROGEN ; METABOLISM ; STREAM ; VARIABILITY ; PHOSPHORUS ; RETENTION ; SENSORS ; FLUXES |
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/21866 |
专题 | 资源环境科学 |
作者单位 | 1.Univ North Carolina Chapel Hill, Inst Environm, Chapel Hill, NC 27514 USA; 2.Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA; 3.Univ Maryland, Dept Chem Biochem & Environm Engn, Baltimore, MD 21201 USA; 4.Univ Maryland, Ctr Urban Environm Res & Educ, Baltimore, MD 21201 USA; 5.CUNY, Grad Ctr, Adv Sci Res Ctr, New York, NY USA; 6.Brooklyn Coll, Dept Earth & Environm Sci, New York, NY USA; 7.Univ North Carolina Chapel Hill, Dept Geog, Chapel Hill, NC USA; 8.Univ Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USA; 9.Univ Virginia, Dept Civil & Environm Engn, Charlottesville, VA USA |
推荐引用方式 GB/T 7714 | Duncan, Jonathan M.,Welty, Claire,Kemper, John T.,et al. Dynamics of nitrate concentration-discharge patterns in an urban watershed[J]. WATER RESOURCES RESEARCH,2017,53(8). |
APA | Duncan, Jonathan M.,Welty, Claire,Kemper, John T.,Groffman, Peter M.,&Band, Lawrence E..(2017).Dynamics of nitrate concentration-discharge patterns in an urban watershed.WATER RESOURCES RESEARCH,53(8). |
MLA | Duncan, Jonathan M.,et al."Dynamics of nitrate concentration-discharge patterns in an urban watershed".WATER RESOURCES RESEARCH 53.8(2017). |
条目包含的文件 | 条目无相关文件。 |
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