globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-016-0255-z
Scopus记录号: 2-s2.0-84990846986
论文题名:
Regional meteorological drivers and long term trends of winter-spring nitrate dynamics across watersheds in northeastern North America
作者: Crossman J.; Catherine Eimers M.; Casson N.J.; Burns D.A.; Campbell J.L.; Likens G.E.; Mitchell M.J.; Nelson S.J.; Shanley J.B.; Watmough S.A.; Webster K.L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 130, 期:3
起始页码: 247
结束页码: 265
语种: 英语
英文关键词: Meteorological drivers ; Nitrate ; Rain-on-snow
Scopus关键词: annual variation ; atmospheric deposition ; community composition ; headwater ; high temperature ; nitrate ; nutrient dynamics ; phytoplankton ; precipitation (climatology) ; regional climate ; snow cover ; spatial variation ; spring (season) ; stochasticity ; watershed ; winter ; Canada ; Ontario [Canada] ; United States ; algae
英文摘要: This study evaluated the contribution of winter rain-on-snow (ROS) events to annual and seasonal nitrate (N-NO3) export and identified the regional meteorological drivers of inter-annual variability in ROS N-NO3 export (ROS-N) at 9 headwater streams located across Ontario, Canada and the northeastern United States. Although on average only 3.3 % of annual precipitation fell as ROS during winter over the study period, these events contributed a significant proportion of annual and winter N-NO3 export at the majority of sites (average of 12 and 42 %, respectively); with the exception of the most northern catchment, where total winter precipitation was exceptionally low (average 77 mm). In years with a greater magnitude of ROS events, the timing of the peak N-NO3 export period (during spring melt) was redistributed to earlier in the year. Variability in ROS frequency and magnitude amongst sites was high and a generalised linear model demonstrated that this spatial variability could be explained by interactive effects between regional and site-specific drivers. Snowpack coverage was particularly important for explaining the site-specific ROS response. Specifically, ROS events were less common when higher temperatures eliminated snow cover despite increasing the proportion of winter rainfall, whereas ROS event frequency was greater at sites where sufficient snow cover remained. This research suggests that catchment response to changes in N deposition is sensitive to climate change; a vulnerability which appears to vary in intensity throughout the seasonally snow-covered temperate region. Furthermore, the sensitivity of stream N-NO3 export to ROS events and potential shifts (earlier) in the timing of N-NO3 export relative to other nutrients affect downstream nutrient stoichiometry and the community composition of phytoplankton and other algae. © 2016, Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83344
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: School of the Environment, Trent University, West Bank Drive, Peterborough, ON, Canada; Department of Geography, University of Winnipeg, Portage Avenue, Winnipeg, MB, Canada; New York Water Science Center, US Geological Survey, 425 Jordan Rd., Troy, NY, United States; Northern Research Station, USDA Forest Service, 271 Mast Rd, Durham, NH, United States; Cary Institute of Ecosystem Studies, Millbrook, NY, United States; Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, United States; State University of New York, College of Environmental Science and Forestry, Syracuse, NY, United States; School of Forest Resources, University of Maine, 5755 Nutting Hall, Orono, ME, United States; New England Water Science Center, US Geological Survey, 331 Commerce Way, Pembroke, NH, United States; Environmental and Resource Studies Program, Trent University, Peterborough, ON, Canada; Natural Resources Canada, Canadian Forest Service, 1219 Queen St. E, Sault Ste. Marie, ON, Canada

Recommended Citation:
Crossman J.,Catherine Eimers M.,Casson N.J.,et al. Regional meteorological drivers and long term trends of winter-spring nitrate dynamics across watersheds in northeastern North America[J]. Biogeochemistry,2016-01-01,130(3)
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