Trends in lake chemistry in response to atmospheric deposition and climate in selected Class I wilderness areas in Colorado, Idaho, Utah, and Wyoming, 1993-2009

Mast, M. Alisa; Ingersoll, George P.

doi:10.3133/sir20115123

Cited by 2 publications

(4 citation statements)

References 21 publications

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“…The temporal pattern in stream nitrate concentrations in LV was found to be similar to those of other high-elevation areas of the Front Range, indicating that it is representative of a regional trend. Figure shows trends in summer nitrate concentrations during 1992–2011 at 14 lakes in different areas of the Front Range . As observed in LV, some of the increase in the mid-2000s likely reflects the influence of the 2002 drought.…”

Section: Discussionmentioning

confidence: 64%

“…Increased nitrate concentrations in high-elevation streams and lakes in the Front Range during the past decade were noted in previous studies, [25][26][27]38,49 and several investigators concluded the response indicates thawing of glacial and permafrost features caused by increasing air temperatures. At nearby Green Lakes Valley (GLV), discharge during September and October was reported to have increased nearly 50% since 1980, which was attributed to thawing of ice-rich permafrost on north-facing slopes.…”

Section: ■ Discussionmentioning

confidence: 65%

“…Figure 7 shows trends in summer nitrate concentrations during 1992−2011 at 14 lakes in different areas of the Front Range. 38 As observed in LV, some of the increase in the mid-2000s likely reflects the influence of the 2002 drought. Despite this complicating factor, lake concentration patterns were very similar to those of total inorganic N concentrations at highelevation NADP sites (Figure 3B), supporting the conclusion that deposition is an important influence on nitrate export.…”

Section: ■ Discussionmentioning

confidence: 88%

“…Summer nitrate concentrations at 14 high-elevation lakes (3140–3855 m) in the Colorado Front Range. Data are from ref .…”

Section: Discussionmentioning

confidence: 99%

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Links between N Deposition and Nitrate Export from a High-Elevation Watershed in the Colorado Front Range

Mast

Clow²,

Baron

et al. 2014

Environ. Sci. Technol.

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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 1990 s, 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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Section: Discussionmentioning

confidence: 64%

Section: ■ Discussionmentioning

confidence: 65%

Section: ■ Discussionmentioning

confidence: 88%

“…Summer nitrate concentrations at 14 high-elevation lakes (3140–3855 m) in the Colorado Front Range. Data are from ref .…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Links between N Deposition and Nitrate Export from a High-Elevation Watershed in the Colorado Front Range

Mast

Clow²,

Baron

et al. 2014

Environ. Sci. Technol.

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Testing tree-ring cellulose δ¹⁸O with water isotopes for Holocene lake δ¹⁸O interpretations in the central Rocky Mountains USA

Anderson,

Mast,

Brice

et al. 2024

The Holocene

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Stable isotopes of water preserved in geologic archives, primarily as oxygen (δ18O), have proven critical for documenting Earth’s climatic and hydrologic systems past and present. However, timescale differences of water isotope inputs to proxy systems and the signal embedded in long paleorecords often confound translation to observed hydroclimatic metrics. Here, a unique 20-year dataset of meteorology, hydrology, and the isotopic composition of weekly meteoric and surface water samples (δ18O, δ2H) are combined with paleoclimate δ18O data from tree-ring cellulose and lake carbonate to better understand proxy signals of Upper Colorado river basin drought. Annual tree-ring cellulose δ18O from Picea engelmannii growing within a glacier-fed creek and a spring discharge area were used to derive annual source water δ18O using a cellulose source-water isotope model. Comparisons with the monitoring record indicates that tree-ring cellulose δ18O tracks variations in wet and dry hydroclimatic extremes. Source water isotopes are shown to reflect the hydroclimate of the current year and some number of previous years as an effective moisture-discharge proxy rather than a precipitation isotope proxy. Results contextualize Holocene lake carbonate δ18O data. The contemporary-to-paleo comparison identifies changes in seasonal precipitation extremes during recent millennia and several earlier arid and monsoon-dominated Holocene periods that exceed the arid maximum of the calibration period.

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Trends in lake chemistry in response to atmospheric deposition and climate in selected Class I wilderness areas in Colorado, Idaho, Utah, and Wyoming, 1993-2009

Cited by 2 publications

References 21 publications

Links between N Deposition and Nitrate Export from a High-Elevation Watershed in the Colorado Front Range

Links between N Deposition and Nitrate Export from a High-Elevation Watershed in the Colorado Front Range

Testing tree-ring cellulose δ¹⁸O with water isotopes for Holocene lake δ¹⁸O interpretations in the central Rocky Mountains USA

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Trends in lake chemistry in response to atmospheric deposition and climate in selected Class I wilderness areas in Colorado, Idaho, Utah, and Wyoming, 1993-2009

Cited by 2 publications

References 21 publications

Links between N Deposition and Nitrate Export from a High-Elevation Watershed in the Colorado Front Range

Links between N Deposition and Nitrate Export from a High-Elevation Watershed in the Colorado Front Range

Testing tree-ring cellulose δ18O with water isotopes for Holocene lake δ18O interpretations in the central Rocky Mountains USA

Contact Info

Product

Resources

About

Testing tree-ring cellulose δ¹⁸O with water isotopes for Holocene lake δ¹⁸O interpretations in the central Rocky Mountains USA