Riverine nitrogen source and yield in urban systems
Riverine nitrogen source and yield in urban systems
复制标题
城市系统中的河流氮源和产量
DOI:
10.1002/fee.2679
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发表时间:
2023
影响因子:
10.3
通讯作者:
Darden, Julie A
中科院分区:
文献类型:
--
作者:
Chung, Angela H;Elliott, Emily M;Bain, Daniel J;Thomas, Brian F;River, Mark;Nim, Carl J;Darden, Julie A
Although human reshaping of the nitrogen (N) cycle is well established, contributions of individual N sources to riverine and coastal eutrophication are less certain. Urban N fluxes are potentially substantial, particularly from sewer overflows. Results from four longitudinal surveys in rivers in and around the city of Pittsburgh, Pennsylvania, were used to characterize N chemistry and isotopic composition and were compared with LOADEST‐model‐derived total N (TN) flux budgets from three urban areas along the Ohio River (Pittsburgh, Pennsylvania; Cincinnati, Ohio; and Louisville, Kentucky). Triple nitrate isotopes reveal that riverine nitrate in the Pittsburgh region is dominated by wastewater inputs despite high atmospheric deposition rates. Our budget estimates demonstrate that the magnitude of urban N yields is comparable to yields reported for agricultural watersheds and that these high urban N yields cannot consist of permitted, point‐source discharges alone. Our results reveal that nonpoint sources in urban systems represent an important but overlooked source of TN to overall riverine budgets.
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影响因子:
7.4
作者:
Sigman, DM;Casciotti, KL;Böhlke, JK
通讯作者:
Böhlke, JK
影响因子:
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通讯作者:
Sigman, Daniel M.