Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR020644 |
Aquatic Nitrate Retention at River Network Scales Across Flow Conditions Determined Using Nested In Situ Sensors | |
Wollheim, W. M.1,2; Mulukutla, G. K.1,2; Cook, C.1,2; Carey, R. O.1,2 | |
2017-11-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Nonpoint pollution sources are strongly influenced by hydrology and are therefore sensitive to climate variability. Some pollutants entering aquatic ecosystems, e.g., nitrate, can be mitigated by in-stream processes during transport through river networks. Whole river network nitrate retention is difficult to quantify with observations. High frequency, in situ nitrate sensors, deployed in nested locations within a single watershed, can improve estimates of both nonpoint inputs and aquatic retention at river network scales. We deployed a nested sensor network and associated sampling in the urbanizing Oyster River watershed in coastal New Hampshire, USA, to quantify storm event-scale loading and retention at network scales. An end member analysis used the relative behavior of reactive nitrate and conservative chloride to infer river network fate of nitrate. In the headwater catchments, nitrate and chloride concentrations are both increasingly diluted with increasing storm size. At the mouth of the watershed, chloride is also diluted, but nitrate tended to increase. The end member analysis suggests that this pattern is the result of high retention during small storms (51-78%) that declines to zero during large storms. Although high frequency nitrate sensors did not alter estimates of fluxes over seasonal time periods compared to less frequent grab sampling, they provide the ability to estimate nitrate flux versus storm size at event scales that is critical for such analyses. Nested sensor networks can improve understanding of the controls of both loading and network scale retention, and therefore also improve management of nonpoint source pollution. Plain Language Summary High frequency in situ nitrate sensors reveal whole river network nitrate retention is high during small storms but declines rapidly to no retention during large storms. Nonpoint nitrate dilutes during storms in headwaters but increases at basin mouth, while chloride dilutes in both headwaters and basin mouth. Wider use of storm even sampling in nested sensor networks increases understanding of catchment biogeochemistry and could improve management of nonpoint pollution. |
英文关键词 | nutrients sensors retention sources network storm |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000418736700060 |
WOS关键词 | SPRING-FED RIVER ; GULF-OF-MEXICO ; NUTRIENT REMOVAL ; LAND-USE ; NITROGEN ; STREAM ; ECOSYSTEMS ; DENITRIFICATION ; PHOSPHORUS ; SIZE |
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/21624 |
专题 | 资源环境科学 |
作者单位 | 1.Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA; 2.Univ New Hampshire, Earth Syst Res Ctr, Durham, NH 03824 USA |
推荐引用方式 GB/T 7714 | Wollheim, W. M.,Mulukutla, G. K.,Cook, C.,et al. Aquatic Nitrate Retention at River Network Scales Across Flow Conditions Determined Using Nested In Situ Sensors[J]. WATER RESOURCES RESEARCH,2017,53(11). |
APA | Wollheim, W. M.,Mulukutla, G. K.,Cook, C.,&Carey, R. O..(2017).Aquatic Nitrate Retention at River Network Scales Across Flow Conditions Determined Using Nested In Situ Sensors.WATER RESOURCES RESEARCH,53(11). |
MLA | Wollheim, W. M.,et al."Aquatic Nitrate Retention at River Network Scales Across Flow Conditions Determined Using Nested In Situ Sensors".WATER RESOURCES RESEARCH 53.11(2017). |
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