Sökning: "microphysical properties"

Visar resultat 6 - 10 av 17 avhandlingar innehållade orden microphysical properties.

  1. 6. Remote sensing of clouds and precipitation using active and passive microwave observations

    Författare :Simon Pfreundschuh; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Microwave remote sensing; precipitation; clouds; hydrometeors;

    Sammanfattning : Global observations of clouds and precipitation are of great importance for weather prediction and the monitoring of the climate. Nonetheless, the currently available record of global observations does not constrain the properties of clouds very well owing to the inherent limitations of the observation systems used to produce them. LÄS MER

  3. 7. Ice clouds in satellite observations and climate models

    Författare :Salomon Eliasson; Corinna Hoose; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rymdteknik; Space Technology;

    Sammanfattning : This thesis concerns the microphysical properties of clouds made up of ice particles, called ice clouds. Ice clouds are strong modulators of the outgoing longwave radiation and incoming shortwave radiation, yet our knowledge on several key ice cloud properties, which govern the magnitude and sign of the net contribution to the Earth’s atmospheric radiation budget, is inadequate. LÄS MER

  4. 8. Secondary ice production : An empirical formulation and organization of mechanisms among simulated cloud-types

    Författare :Akash Deshmukh; MERGE: ModElling the Regional and Global Earth system; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ice; collision; ice production; ice enhancement; secondary ice; sublimation; fragmentation;

    Sammanfattning : Clouds are essential elements within Earth's atmosphere, posing a challenge for cloud-resolving models in understanding the creation of new cloud ice particles from existing ice and liquid phases. Such ice initiation determines cloud microphysical and radiative properties, influencing cloud phase, precipitation and cloud extent/properties. LÄS MER

  5. 9. Aerosol-cloud-radiation interactions in global climate models

    Författare :Lena Frey; Frida A.-M. Bender; Gunilla Svensson; Laura Wilcox; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Aerosols; clouds; global climate models; atmosfärvetenskap och oceanografi; Atmospheric Sciences and Oceanography;

    Sammanfattning : Clouds can reflect, absorb and re-emit radiation, thereby inducing a cooling or warming effect on the climate. However, the response of clouds to a changing climate is highly uncertain and the representation of clouds in state-of-the-art climate models remains a key challenge for future climate projections. LÄS MER

  7. 10. Noctilucent clouds in a coupled atmosphere

    Författare :Bodil Karlsson; Peter Sigray; Jacek Stegman; Scott Bailey; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Noctilucent clouds; atmospheric dynamics; Meteorology; Meteorologi; atmosfärvetenskap; Atmospheric Sciences;

    Sammanfattning : Noctilucent clouds (NLC) at altitudes around 80 km are the highest clouds in our atmosphere. They have been a subject of research ever since their discovery in the late 19th century. This thesis takes an important step towards using NLC as a tool for studying dynamic coupling processes in the atmosphere on a global scale. LÄS MER