Transcript of SMOG FOTOQUÍMICO. este radical baja da lugar a la formación de otros contaminantes como el nitrato de peroxiciacetilo. EL OXÍGENO ATÓMICO ES UNA ESPECIE MUY REACTIVA Y PUEDE DESENCADENAR VARIAS REACCIONES IMPORTANTES, COMO LA. Se denomina smog fotoquímico (“smoke” humo, y “fog” niebla) a la contaminación del aire por ozono, y otros compuestos, principalmente en.
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Using air quality measurements, fofmacion categorized air pollution according to source sectors in a rural background environment in southern Sweden based on hourly air-mass backward trajectories during — Concentrations of fine PM2. The highest ultrafine particle numberswere associated with clean air from the northwest.
We estimate that almost 7. Reductions of emissions in eastern Europe would reduce the highest air pollution concentrations and associated health risks. However, since air masses from the southwest are more frequent, emissions in the western part of Europe are more important for annual mean premature mortality.
InJunge postulated a relationship between variability of concentrations of gases in air at remote locations and their atmospheric residence time, and this Junge relationship has subsequently been observed empirically for a range of trace gases.
Here, we analyze two previously-published datasets of concentrations of cyclic volatile methyl siloxanes cVMS in air and find Junge relationships in both.
The first dataset is a time series of concentrations of decamethylcyclopentasiloxane D-5 measured between January and June, at a rural site in southern Sweden that shows a Junge relationship in the temporal variability of the measurements.
The second dataset consists of measurements of hexamethylcyclotrisiloxane D-3octamethylcyclotetrasiloxane D-4 and D-5 made simultaneously at 12 sites in the Global Atmospheric Passive Sampling GAPS network that shows a Junge relationship in the spatial variability of the three cVMS congeners. We use the Junge relationship for the GAPS dataset to estimate atmospheric lifetimes of dodecamethylcyclohexasiloxane D-68: C Elsevier Ltd.
Water-soluble organic carbon WSOC is typically a large component of carbonaceous aerosols with a high propensity for inducing cloud formation. The sources of WSOC, which may be both of primary and secondary origins, are in general poorly constrained. This study assesses the concentrations and dual-carbon isotope 14C and 13C signatures of South Asian WSOC during a month continuous campaign in Monsoon-driven meteorology yields significant WSOC concentration differences between formacin dry winter season 0.
This is consistent with particle-phase aging processes influencing the del13C-WSOC signal in the South Asian regional receptor atmosphere. This study presents a new method for collecting and handling saliva samples using an automated analytical microsyringe and microextraction by packed syringe MEPS.
An exact volume of saliva could be collected. Fotosuimico absorb radiation in the near-ultraviolet UV range of the electromagnetic spectrum and thus are potential components of poorly characterized light-absorbing organic matter “brown carbon” which can affect the climate and air quality.
SMOG FOTOQÍMICO by María Alejandra Rodríguez Gómez on Prezi
Total NP concentrations varied between less than 1 and 98 ng m -3with a mean value of 20 ng m We conclude that NPs measured in Detling have a significant contribution from biomass burning with an estimated emission factor of 0. Particle light absorption measurements by a seven-wavelength aethalometer in the near-UV nm and literature values of molecular absorption cross sections tormacion used to estimate the contribution of NP to wood burning brown carbon UV light absorption.
They can thus affect atmospheric radiative transfer and photochemistry and with that climate and air quality. We present a simple method of probabilistic risk analysis for ecosystems. The only requirements are time series-modelled or formaciln environment and ecosystem variables.
Risk is defined as the product of hazard probability and ecosystem vulnerability. Vulnerability is the expected difference in ecosystem performance between years with and without hazardous conditions.
We show an application to drought risk for net primary productivity of coniferous forests across Europe, for both recent and future climatic conditions. Concentrations of sog organic contaminants fotoquimido snow, soil, lake water and vegetation have been observed to increase with altitude along mountain slopes.
Milk sampled repeatedly from cows that had grazed at three different altitudes in Switzerland during one summer was analyzed for a range of persistent organic pollutants. Mountain cold-trapping significantly increased air-to-milk transfer factors of most analytes.
As a result the milk of cows grazing at higher altitudes was more contaminated with substances that have regionally uniform air concentrations hexachlorobenzene, alpha-hexachlorocyclohexane, endosulfan sulfate.
Glossary: compuestos orgï¿½nicos volï¿½tiles – Clean Energy Information Portal – reegle
For substances that have sources, and therefore higher air concentrations, at lower altitudes polychlorinated biphenyls, gamma-hexachlorocyclohexanealpine milk has lower concentrations, but not as low as would be expected without mountain cold-trapping. Differences in the elevational gradients in soil concentrations and air-to-milk transfer factors highlight that cold trapping of POPs in pastures is mostly due to increased gas phase deposition as a result of lower temperatures causing higher uptake capacity of plant foliage, whereas cold trapping in soils more strongly depends on wet and dry particle deposition.
Climatic influences on air-to-milk transfer of POPs needs to be accounted for when using contamination of milk lipids to infer contamination of the atmosphere. All publication types Book chapter Conf.