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- W3207670122 abstract "Nitrate concentrations in high-elevation lakes of the Colorado Front Range remain elevated despite declining trends in atmospherically deposited nitrate since 2000. The current source of this elevated nitrate in surface waters remains elusive, given shifts in additional nitrogen sources via glacial inputs and atmospheric ammonium deposition. We present the complete isotopic composition of nitrate (δ15N, δ18O, and Δ17O) from a suite of nitrate-bearing source waters collected during the summers of 2017-2018 from two alpine ecosystems to constrain the provenance of elevated nitrate in surface waters during the summer open-water season. The results indicate a consistent contribution of uncycled atmospheric nitrate throughout the summer (13-23%) to alpine lakes, despite seasonal changes in source water inputs. The balance of nitrate (as high as 87% in late summer) is likely from nitrate production within the catchment via nitrification of reduced nitrogen sources (e.g., thawed soil organic matter and ammonium deposition) and released with rock glacier meltwater. The role of microbially produced nitrate has become increasingly important over time based on historical surface water samples from the mid-90s to present, a trend coincident with increasing ammonium deposition to alpine systems." @default.
- W3207670122 created "2021-10-25" @default.
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- W3207670122 creator A5082135949 @default.
- W3207670122 creator A5085577006 @default.
- W3207670122 date "2021-10-12" @default.
- W3207670122 modified "2023-10-12" @default.
- W3207670122 title "Persistent Nitrate in Alpine Waters with Changing Atmospheric Deposition and Warming Trends" @default.
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- W3207670122 doi "https://doi.org/10.1021/acs.est.1c02515" @default.
- W3207670122 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34637308" @default.
- W3207670122 hasPublicationYear "2021" @default.
- W3207670122 type Work @default.