Chronological refinement of an ice core record at Upper Fremont Glacier in south central North America

Schuster, Paul F.; White, David; Naftz, David L.; Cecil, L. DeWayne

doi:10.1029/1999jd901095

Cited by 42 publications

(90 citation statements)

References 28 publications

(16 reference statements)

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“…The limited data available on ice cores in this region are consistent with our observations. For example, ice from the Upper Fremont Glacier in the central Rocky Mountains (Wind River Range) contains variable amounts of NO 3 -over time, with concentrations occasionally above 10 µg L -1 between 1717 and 1985, and then in excess of 100 µg L -1 after 1985 (35). Samples that we collected from the Sundance Glacier revealed NO 3 -concentrations of 11 µg N L -1 in the ice, 28 µg N L -1 in a meltwater stream on the surface of the glacier, and 158 µg N L -1 in a pond situated on the surface of the glacier, receiving the surface meltwater stream.…”

Section: Low Nomentioning

confidence: 99%

Melting Alpine Glaciers Enrich High-Elevation Lakes with Reactive Nitrogen

Saros

Rose

Clow

et al. 2010

Environ. Sci. Technol.

112

107

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See next page for additional authorsFollow this and additional works at: https://digitalcommons.unl.edu/geosciencefacpub Part of the Earth Sciences CommonsThis Article is brought to you for free and open access by the Earth and Atmospheric Sciences, Department of at DigitalCommons@University of Nebraska -Lincoln. It has been accepted for inclusion in Papers in the Earth and Atmospheric Sciences by an authorized administrator of DigitalCommons@University of Nebraska -Lincoln. Alpine glaciers have receded substantially over the last century in many regions of the world. Resulting changes in glacial runoff not only affect the hydrological cycle, but can also alter the physical (i.e., turbidity from glacial flour) and biogeochemical properties of downstream ecosystems. Here we compare nutrient concentrations, transparency gradients, algal biomass, and fossil diatom species richness in two sets of high-elevation lakes: those fed by snowpack melt alone (SF lakes) and those fed by both glacial and snowpack meltwaters (GSF lakes). We found that nitrate (NO 3 -) concentrations in the GSF lakes were 1-2 orders of magnitude higher than in SF lakes. Although nitrogen (N) limitation is common in alpine lakes, algal biomass was lower in highly N-enriched GSF lakes than in the N-poor SF lakes. Contrary to expectations, GSF lakes were more transparent than SF lakes to ultraviolet and equally transparent to photosynthetically active radiation. Sediment diatom assemblages had lower taxonomic richness in the GSF lakes, a feature that has persisted over the last century. Our results demonstrate that the presence of glaciers on alpine watersheds more strongly influences NO 3 -concentrations in high-elevation lake ecosystems than any other geomorphic or biogeographic characteristic. Melting Alpine Glaciers Enrich High-Elevation Lakes with Reactive Nitrogen

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Section: Low Nomentioning

confidence: 99%

Melting Alpine Glaciers Enrich High-Elevation Lakes with Reactive Nitrogen

Saros

Rose

Clow

et al. 2010

Environ. Sci. Technol.

112

107

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Section: Introductionmentioning

confidence: 99%

“…Many of these proxies are derived from meteoric waters and thus record temporal variations in the isotopic composition of precipitation (hereafter δ 18 O p , where the isotopic composition is defined as: δ = R/R STANDARD − 1, where R is the heavy to light isotope ratio). It is important for the interpretation of climate proxies to better understand the causes of temporal variations in δ 18 O p within a given region. Within the tropics and subtropics, δ 18 O p is typically linked to changes in precipitation rates (the amount effect) [5][6][7][8][9][10][11][12], whereas measurements from outside of the tropics and subtropics usually show correlations between δ…”

Section: Introductionmentioning

confidence: 99%

“…Stable oxygen and hydrogen isotopes (primarily 18 O and deuterium) preserved in geological archives are commonly used as proxies of past climatic changes (e.g., see reviews: [1][2][3][4]). Many of these proxies are derived from meteoric waters and thus record temporal variations in the isotopic composition of precipitation (hereafter δ 18 O p , where the isotopic composition is defined as: δ = R/R STANDARD − 1, where R is the heavy to light isotope ratio).…”

Section: Introductionmentioning

confidence: 99%

“…In the interior of the western U.S., a strong temperature effect was found only after annual mean temperatures were weighted by monthly precipitation totals. These multiple influences on δ 18 O p complicate interpretations of western U.S. climate proxies that are derived from isotopes in precipitation. …”

mentioning

confidence: 99%

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Diagnosing Atmospheric Influences on the Interannual 18O/16O Variations in Western U.S. Precipitation

Buenning

Stott

Kanner

et al. 2013

Water

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Many climate proxies in geological archives are dependent on the isotopic content of precipitation (δ 18 O p ), which over sub-annual timescales has been linked to temperature, condensation height, atmospheric circulation, and post-condensation exchanges in the western U.S. However, many proxies do not resolve temporal changes finer than interannual-scales. This study explores causes of the interannual variations in δ O p in California. In the interior of the western U.S., a strong temperature effect was found only after annual mean temperatures were weighted by monthly precipitation totals. These multiple influences on δ 18 O p complicate interpretations of western U.S. climate proxies that are derived from isotopes in precipitation.

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Catalytic Three‐Component Domino Reaction for the Preparation of Trisubstituted Oxazoles

Wachenfeldt

Röse

Paulsen

et al. 2013

Chemistry A European J

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Multicomponent reactions are attractive for assembling functionalized heterocyclic compounds. To this end, an efficient gold-catalyzed three-component domino reaction to form oxazoles directly from imines, alkynes, and acid chlorides is presented. The reaction proceeds in a single synthetic step by using a gold(III)-N,N'-ethylenebis(salicylimine) (salen) catalyst to give trisubstituted oxazoles in up to 96 % yield. The substrate scope, a mechanistic study exploring the role of the gold catalyst, and the synthetic applications of the oxazole products are discussed.

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Chronological refinement of an ice core record at Upper Fremont Glacier in south central North America

Cited by 42 publications

References 28 publications

Melting Alpine Glaciers Enrich High-Elevation Lakes with Reactive Nitrogen

Melting Alpine Glaciers Enrich High-Elevation Lakes with Reactive Nitrogen

Diagnosing Atmospheric Influences on the Interannual 18O/16O Variations in Western U.S. Precipitation

Catalytic Three‐Component Domino Reaction for the Preparation of Trisubstituted Oxazoles

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