Search results for "Sub arctic"

showing 2 items of 2 documents

The trophic transfer of persistent pollutants (HCB, DDTs, PCBs) within polar marine food webs.

2017

Biomagnification (increase in contaminant concentrations at successively higher levels of trophic web), is a process that can transversally impair biodiversity and human health. Most research shows that biomagnification should be higher at poles with northern sites having a major tendency to biomagnify Persistent Organic Pollutants (POPs) through their marine food webs. We investigated the biomagnification degree into two marine trophic webs combining carbon and nitrogen stable isotopes and POP analyses. We showed that the Antarctic trophic web was more depleted than the sub-Arctic one and the differences highlighted for the basal part could explain the difference in length between them. Co…

Settore BIO/07 - EcologiaEnvironmental EngineeringFood Chain010504 meteorology & atmospheric sciencesHealth Toxicology and MutagenesisBiomagnificationDichlorodiphenyl DichloroethyleneBiodiversityAntarctic Regions010501 environmental sciences01 natural sciencesBiomagnification; Marine organisms; POPs; Ross Sea; Stable isotopes; Sub-Arctic; Chemistry (all); Environmental ChemistryHuman healthchemistry.chemical_compoundSub arcticRoss SeaMarine organismHexachlorobenzeneEnvironmental ChemistryAnimalsSeawaterPOPsMarine organismsStable isotopesBiomagnification0105 earth and related environmental sciencesTrophic levelPollutantCarbon IsotopesNitrogen IsotopesEcologyStable isotope ratioArctic RegionsChemistry (all)Public Health Environmental and Occupational HealthFishesGeneral MedicineGeneral ChemistryHexachlorobenzenePOPStable isotopePollutionPolychlorinated BiphenylsSub-ArcticchemistryEnvironmental chemistryVertebratesEnvironmental scienceWater Pollutants ChemicalChemosphere
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Rapid chemical evolution of tropospheric volcanic emissions from Redoubt Volcano, Alaska, based on observations of ozone and halogen-containing gases

2013

Abstract We report results from an observational and modeling study of reactive chemistry in the tropospheric plume emitted by Redoubt Volcano, Alaska. Our measurements include the first observations of Br and I degassing from an Alaskan volcano, the first study of O 3 evolution in a volcanic plume, as well as the first detection of BrO in the plume of a passively degassing Alaskan volcano. This study also represents the first detailed spatially-resolved comparison of measured and modeled O 3 depletion in a volcanic plume. The composition of the plume was measured on June 20, 2010 using base-treated filter packs (for F, Cl, Br, I, and S) at the crater rim and by an instrumented fixed-wing a…

Sub arctic troposphereReactive halogenOzone010504 meteorology & atmospheric sciencesChemical evolutionBromine monoxide; Chemical evolution; Ozone depletion; Reactive halogen; Sub arctic troposphere; Volcanic plumeOzone depletion010502 geochemistry & geophysicsAtmospheric sciences01 natural sciencesVolcanic plumeTropospherechemistry.chemical_compoundImpact craterGeochemistry and Petrology0105 earth and related environmental sciencesgeographygeography.geographical_feature_categoryBromine monoxideOzone depletionPlumeGeophysicschemistryVolcano13. Climate actionHalogenGeologyWater vapor
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