Search for dissertations about: "Atmospheric composition and structure"

Showing result 1 - 5 of 26 swedish dissertations containing the words Atmospheric composition and structure.

  2. 1. The effect of surface steps and oxides on the catalytic activity on model Pd and Rh catalysts

    Author : Chu Zhang; Synkrotronljusfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Surface X-ray diffraction SXRD ; X-ray photonelectron spectroscopy; Catalytic activity; Oxide; Single Crystal surface; surface structure; vicinal surface; CO oxidation; stepped surface; Fysicumarkivet A:2018:Zhang;

    Abstract : A catalyst is a substance that can speed up the rate of a chemical reaction without itself being consumed. Catalysts are crucial for chemical production industries, where about 90% of all chemicals are produced using catalysts. READ MORE

  4. 2. Detecting changes in climate and atmospheric composition with tracers in Arctic ice caps

    Author : Margareta Hansson; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Changes in climate and atmospheric composition over decades to a hundred thousand years have been studied by extracting records of various tracers from two Arctic ice cores. A seven metre long ice core of superimposed ice was recovered from the Storöya ice cap in north-eastern Svalbard. READ MORE

  5. 3. Investigating parameters governing liquid-phase cloud activation of atmospheric particles

    Author : Maryam Dalirian; Ilona Riipinen; Ottmar Möhler; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; CCN activation; surface tension; coated aerosols; black carbon; Applied Environmental Science; tillämpad miljövetenskap;

    Abstract : Aerosol-cloud interactions are one of the main sources of uncertainties in modeling and predicting the Earth’s climate. To overcome this uncertainty, we need to improve the understanding about the processes and parameters defining how aerosol particles turn into cloud condensation nuclei (CCN) or ice nuclei (IN) to produce cloud droplets or ice crystals. READ MORE

  6. 4. Primary and secondary organics in biogenic atmospheric aerosol : The chiral study of 2-methyltetrols from method development to application

    Author : Nélida Jocelyn Donají Karlsson; Kevin Noone; Sandro Fuzzi; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; atmospheric organic aerosols; 2-methyltetrols; isoprene; chiral GC-MS; enantiomeric composition; Applied Environmental Science; tillämpad miljövetenskap;

    Abstract : Distinguishing between the primary and secondary origin of the organic components in atmospheric aerosols is one of the key parameters in assessing the relevance and role of different chemical species in the overall chemistry of the atmosphere. Currently available methods used in field measurements are not able to fully discriminate between the primary or secondary origin of compounds detected in atmospheric aerosols. READ MORE

  7. 5. Tomographic views of the middle atmosphere from a satellite platform

    Author : Kristoffer Hultgren; Jörg Gumbel; Christian von Savigny; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Atmosphere; Mesosphere; Noctilucent Clouds; Polar Mesospheric Clouds; Tomography; Remote sensing; Odin; OSIRIS; atmosfärvetenskap och oceanografi; Atmospheric Sciences and Oceanography;

    Abstract : The middle atmosphere is a very important part of the Earth system. Until recently, we did not realize the importance of the structure of this vaporous shell and of the fundamental role it plays in both creating and sustaining life on the planet. READ MORE