Measurement of heavy isotope enrichment in tropospheric ozone

1995 ◽  
Vol 22 (13) ◽  
pp. 1713-1716 ◽  
Author(s):  
D. Krankowsky ◽  
F. Bartecki ◽  
G. G. Klees ◽  
K. Mauersberger ◽  
K. Schellenbach ◽  
...  
Keyword(s):  
Tropospheric Ozone ◽  
Isotope Enrichment ◽  
Heavy Isotope

Distribution of mercury species and mercury isotope ratios in soils and river suspended matter of a mercury mining area

2018 ◽  
Vol 20 (4) ◽  
pp. 621-631 ◽  
Author(s):  
Carluvy Baptista-Salazar ◽  
Holger Hintelmann ◽  
Harald Biester
Keyword(s):  
Suspended Matter ◽  
Isotope Analysis ◽  
Isotope Ratios ◽  
Mining Area ◽  
Mercury Species ◽  
Isotope Enrichment ◽  
Heavy Isotope ◽  
Mercury Isotope ◽  
Species Transformation ◽  
Mercury Mining

Light/heavy isotope enrichment is strongly related with Hg species. Combining Hg isotope analysis and Hg speciation allows the differentiation between Hg sources and Hg species transformation in Hg contaminated areas.

scholarly journals Weertman regelation, multiple refreezing events and the isotopic evolution of the basal ice layer

1993 ◽  
Vol 39 (132) ◽  
pp. 275-291 ◽  
Author(s):  
Bryn Hubbard ◽  
Martin Sharp
Keyword(s):  
Isotopic Composition ◽  
Isotopic Fractionation ◽  
Base Flow ◽  
Isotope Enrichment ◽  
Heavy Isotope ◽  
Fractionation Process ◽  
Basal Ice ◽  
Internal Morphology ◽  
Isotopic Evolution ◽  
Simulation Results

AbstractA simple model is developed to simulate the isotopic fractionation which accompanies Weertman regelation at the bed of temperate-based glaciers. The fractionation equations of Jouzel and Souchez (1982) are applied to multiple refreezing events over measured glacier-bed profiles, and mass balance is maintained as the basal ice and meltwater produced at one bedrock hummock enter the next. Simulation results indicate that undeformed regelation ice layers are on the order of millimetres to centimetres thick, often being completely melted at the stoss face of certain hummocks and exceptionally reaching a thickness in excess of 10 cm. Neither the internal morphology nor the isotopic composition of these layers is constant, but both vary down-glacier in accordance with bedrock configuration. A glacier-wide fractionation process is identified whereby heavy isotopes are preferentially removed from the basal meltwater film and incorporated into the basal ice. This process might go some way to explaining the anomalously “light” isotopic composition measured in base-flow waters leaving some glaciers. Vertical isotope profiles through undeformed basal ice layers are reconstructed and show that significant isotopic excursions can occur at a scale of millimeteres, while the range of isotopic compositions within such multi-layered regelation ice is greater than that which would occur in ice produced by a single refreezing event. In circumstances where the regelation system is disrupted by removal of film waters into a network of linked cavities, it is found that the remaining basal ice may be significantly enriched in heavy isotopes relative to the composition of the initial mass inputs to the system. Heavy isotope enrichment of this magnitude and consideration of the thickness of the basal ice layers concerned may explain the absence of recorded basal ice samples heavy enough to have been formed in equilibrium with subglacial precipitates sampled at one of the sites (Glacier de Tsanfleuron) and reported in an earlier paper.

scholarly journals Weertman regelation, multiple refreezing events and the isotopic evolution of the basal ice layer

1993 ◽  
Vol 39 (132) ◽  
pp. 275-291 ◽  
Author(s):  
Bryn Hubbard ◽  
Martin Sharp
Keyword(s):  
Isotopic Composition ◽  
Isotopic Fractionation ◽  
Base Flow ◽  
Isotope Enrichment ◽  
Heavy Isotope ◽  
Fractionation Process ◽  
Basal Ice ◽  
Internal Morphology ◽  
Isotopic Evolution ◽  
Simulation Results

AbstractA simple model is developed to simulate the isotopic fractionation which accompanies Weertman regelation at the bed of temperate-based glaciers. The fractionation equations of Jouzel and Souchez (1982) are applied to multiple refreezing events over measured glacier-bed profiles, and mass balance is maintained as the basal ice and meltwater produced at one bedrock hummock enter the next. Simulation results indicate that undeformed regelation ice layers are on the order of millimetres to centimetres thick, often being completely melted at the stoss face of certain hummocks and exceptionally reaching a thickness in excess of 10 cm. Neither the internal morphology nor the isotopic composition of these layers is constant, but both vary down-glacier in accordance with bedrock configuration. A glacier-wide fractionation process is identified whereby heavy isotopes are preferentially removed from the basal meltwater film and incorporated into the basal ice. This process might go some way to explaining the anomalously “light” isotopic composition measured in base-flow waters leaving some glaciers. Vertical isotope profiles through undeformed basal ice layers are reconstructed and show that significant isotopic excursions can occur at a scale of millimeteres, while the range of isotopic compositions within such multi-layered regelation ice is greater than that which would occur in ice produced by a single refreezing event. In circumstances where the regelation system is disrupted by removal of film waters into a network of linked cavities, it is found that the remaining basal ice may be significantly enriched in heavy isotopes relative to the composition of the initial mass inputs to the system. Heavy isotope enrichment of this magnitude and consideration of the thickness of the basal ice layers concerned may explain the absence of recorded basal ice samples heavy enough to have been formed in equilibrium with subglacial precipitates sampled at one of the sites (Glacier de Tsanfleuron) and reported in an earlier paper.

scholarly journals Shifts in rotifer life history in response to stable isotope enrichment: testing theories of isotope effects on organismal growth

2017 ◽  
Vol 4 (3) ◽  
pp. 160810 ◽  
Author(s):  
Elena Gorokhova
Keyword(s):  
Stable Isotope ◽  
Brachionus Plicatilis ◽  
Isotope Effects ◽  
Experimental Studies ◽  
Isotope Enrichment ◽  
Heavy Isotope ◽  
Material Transfer ◽  
Stable Isotope Labelling ◽  
Isotope Labelling

In ecology, stable isotope labelling is commonly used for tracing material transfer in trophic interactions, nutrient budgets and biogeochemical processes. The main assumption in this approach is that the enrichment with a heavy isotope has no effect on the organism growth and metabolism. This assumption is, however, challenged by theoretical considerations and experimental studies on kinetic isotope effects in vivo . Here, I demonstrate profound changes in life histories of the rotifer Brachionus plicatilis fed 15 N-enriched algae (0.4–5.0 at%); i.e. at the enrichment levels commonly used in ecological studies. These findings support theoretically predicted effects of heavy isotope enrichment on growth, metabolism and ageing in biological systems and underline the importance of accounting for such effects when using stable isotope labelling in experimental studies.

Tropospheric ozone columns and ozone profiles for Kyiv in 2007

2008 ◽  
Vol 14 (5) ◽  
pp. 85-94 ◽  
Author(s):  
A.V. Shavrina ◽  
◽  
Ya.V. Pavlenko ◽  
O.A. Veles' ◽  
V.A. Sheminova ◽  
...  
Keyword(s):  
Tropospheric Ozone

Vertical distribution of tropospheric ozone in Antarctica and in the European Arctic

Tellus B ◽  
1993 ◽  
Vol 45 (2) ◽  
pp. 106-119 ◽  
Author(s):  
Petteri Taalas ◽  
Esko KyrÖ ◽  
Ari Supperi ◽  
Victoria Tafuri ◽  
Maximo Ginzburg
Keyword(s):  
Vertical Distribution ◽  
Tropospheric Ozone ◽  
European Arctic

scholarly journals Evaluation of tropospheric ozone reanalyses with independent ozonesonde observations in East Asia

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Sunmin Park ◽  
Seok-Woo Son ◽  
Myung-Il Jung ◽  
Jinkyung Park ◽  
Sang Seo Park
Keyword(s):  
East Asia ◽  
Tropospheric Ozone
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