Title |
Links between N Deposition and Nitrate Export from a High-Elevation Watershed in the Colorado Front Range
|
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Published in |
Environmental Science & Technology, November 2014
|
DOI | 10.1021/es502461k |
Pubmed ID | |
Authors |
M. Alisa Mast, David W. Clow, Jill S. Baron, Gregory A. Wetherbee |
Abstract |
Long-term patterns of stream nitrate export and atmospheric N deposition were evaluated over three decades in Loch Vale, a high-elevation watershed in the Colorado Front Range. Stream nitrate concentrations increased in the early 1990s, peaked in the mid-2000s, and have since declined by over 40%, coincident with trends in nitrogen oxide emissions over the past decade. Similarities in the timing and magnitude of N deposition provide evidence that stream chemistry is responding to changes in atmospheric deposition. The response to deposition was complicated by a drought in the early 2000s that enhanced N export for several years. Other possible explanations, including forest disturbance, snow depth, or permafrost melting, could not explain patterns in N export. Our results show that stream chemistry responds rapidly to changes in N deposition in high-elevation watersheds, similar to the response observed to changes in sulfur deposition. |
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Mendeley readers
Geographical breakdown
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Japan | 1 | 2% |
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Student > Doctoral Student | 3 | 6% |
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Unknown | 10 | 19% |
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