Sökning: "O3"

Visar resultat 1 - 5 av 54 avhandlingar innehållade ordet O3.

  1. 1. Satellite Limb-Scatter Observations of Stratospheric NO2 and O3 -Retrievals, Validation and Applications

    Författare :Samuel Brohede; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; satellite; NO2; Odin; limb-scatter; validation; OSIRIS; stratosphere; remote sensing; O3; retrieval;

    Sammanfattning : Global observations of vertically resolved atmospheric constituents with high temporal and spatial sampling are crucial for various scientific assessments of ozone depletion and climate change. This thesis explains how such data can be retrieved from satellite limb-scatter observations. LÄS MER

  3. 2. A Study of Polar Ozone Depletion in the Lower Stratosphere. -Dynamical assimilation of O3 and N2O data from Odin/SMR and ENVISAT/MIPAS

    Författare :JOHN RÖSEVALL; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SMR; O3; stratosphere; Odin; data assimilation; transport modelling; atmosphere; NO2; ozone depletion; MIPAS;

    Sammanfattning : For more than 20 years, a hole in the ozone layer has formed each spring over Antarctica when sunlight returns to the polar region. Similar albeit far less extensive ozone destruction has also been observed in the Arctic polar vortex after colder than average winters. LÄS MER

  4. 3. Carbon Dioxide: The Unknown Factor in the Atmospheric Corrosion of Light Metals. A Laboratory Study

    Författare :Daniel Bengtsson Blücher; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SO2; temperature; CO2; atmospheric corrosion; magnesium; NO2; aluminum alloys; NaCl; O3; Mg-Al alloys;

    Sammanfattning : The atmospheric corrosion of Al and Mg-Al alloys was investigated using controlled air in the laboratory. The effects of CO2, temperature, NaCl, relative humidity, SO2, NO2 and O3 on corrosion rate and corrosion product composition were examined. LÄS MER

  5. 4. Modelling as a Tool to Evaluate Continuously Measured Concentration Value of Gaseous Indoor Air Pollutants

    Författare :Martin Kraenzmer; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NO2; modeling; TVOC; modelling; indoor air; pollutants; continuous monitoring; NOx; VOC; NO; O3; continuous measurement; CO; CO2;

    Sammanfattning : Results from studies of air quality in buildings are often difficult to interpret and evaluate and, in order to avoid erroneous conclusions, special evaluating tools may be needed. Modelling in various forms can be used as a method of evaluating measured values from such investigations. LÄS MER

  7. 5. On Numerical Tracer Advection in the Stratosphere and Assimilation of Data from Satellites

    Författare :JOHN RÖSEVALL; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; stratosphere; transport modelling; O3; ozone depletion; data assimilation;

    Sammanfattning : Since the early 1980's, large scale ozone depletion has been observed in the lower regions of the ozone layer over Antarctica when sunlight returns to the polar region in the early spring. The destruction of ozone is attributed to anthropogenic emissions of freon and halon compounds that have augmented the natural stratospheric concentrations of nonreactive Clx and Brx reservoir species with several hundred percent. LÄS MER