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• W2185969229 abstract "Parman, Jordan N. (M.A. Geography) Climatological and Elevational Controls on Organic and Inorganic Nutrients in Stream Waters, Boulder Creek Watershed, Colorado Front Range Thesis directed by Professor Mark W. Williams Due to short growing seasons, sparse vegetation, thin soils, and a harsh climate, the biota of high elevation ecosystems throughout the Colorado Front Range are sensitive to disturbance. These ecosystems are subject to two major drivers of environmental change: directional changes in climate and increasing inorganic nitrogen (N) deposition in wetfall. By analyzing long term climate records and water chemistry data, we investigate the role of climate and N deposition in determining nitrate export from Green Lakes Valley in the Colorado Front Range. We found that streamwater nitrate concentrations observed at the Green Lakes 4 (GL4) outlet have significantly increased by 0.27 μeq L -1 yr -1 between 1985 and 2009. In contrast, there was not an increasing nitrate trend at the subalpine site. Comparing solute chemistry before and after the regional drought that began in 2000, we show a 114% increase in sulfate concentrations, an 82% increase in calcium and a 42% increase in silica concentrations at GL4, suggesting that flowpaths switch towards an increasing contribution from rock glacier melt during dry years. Simple mass balance models indicate that there is a net gain of nitrate between the two highest elevation sites of approximately 0.22 moles NO3 m -1 d -1 , suggesting high nitrification potential in the recently exposed alpine soils. These findings confound emission policies and associated water quality improvement efforts, as climate change and cryosphere melt may affect alpine nitrate concentrations as much, or more than atmospheric deposition trends. The Landscape Continuum Model (LCM) is a conceptual framework for how mountain ecosystems accumulate and redistribute exogenous and endogenous materials, emphasizing the" @default.
• W2185969229 created "2016-06-24" @default.
• W2185969229 creator A5070456273 @default.
• W2185969229 date "2010-01-01" @default.
• W2185969229 modified "2023-09-27" @default.
• W2185969229 title "Climatological and Elevational Controls on Organic and Inorganic Nutrients in Stream Waters, Boulder Creek Watershed, Colorado Front Range" @default.
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