Sökning: "Johan Kleman"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden Johan Kleman.

  1. 1. The mutual interaction between the time-mean atmospheric circulation and continental-scale ice sheets

    Författare :Johan Liakka; Johan Nilsson; Johan Kleman; Gerard Roe; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Atmospheric stationary waves; Paleo ice sheets; Ice-sheet ablation; Atmosphere-ice sheet modelling; Climatology; Klimatologi; Meteorology; Meteorologi; atmosfärvetenskap och oceanografi; Atmospheric Sciences and Oceanography;

    Sammanfattning : Geomorphological evidence of glaciations exist for the Last Glacial Maximum (about 20 kyr ago). At this time, both North America and Eurasia were covered by extensive ice sheets which are both absent today. LÄS MER

  3. 2. The spectral reflectance of coniferous tree stands and of barley influenced by stress : an analysis of field measured spectral data

    Författare :Johan Kleman; Stockholms universitet; []
    Nyckelord :spectral reflectance; field measurement; middle infrared; crops; fertilisation; irrigation; coniferous forest; helicopter; measuring geometry;

    Sammanfattning : This thesis focuses on the spectral signatures for vegetation. Knowledge about the spectral characteristics of different vegetation types is imperative for an efficient use of existing remote sensing systems, and also to provide guidelines for sensor development. LÄS MER

  4. 3. Palaeo-ice streams in the north-eastern Laurentide Ice Sheet

    Författare :Hernán De Angelis; Johan Kleman; Krister Jansson; Colm O'Cofaigh; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ice sheet; ice stream; palaeo-ice sheet; palaeo-ice stream; glaciology; palaeoglaciology; Laurentide Ice Sheet; Physical geography; Naturgeografi; geografi med naturgeografisk inriktning; Physical Geography;

    Sammanfattning : This thesis presents a palaeoglaciological study aimed to determine the location, geometry and temporal evolution of palaeo-ice streams of the north-easternmost Laurentide Ice Sheet. The work was accomplished through the geomorphological interpretation of satellite imagery over 3. LÄS MER

  5. 4. Mountain centered icefields in northern Scandinavia

    Författare :Ola Fredin; Clas Hättestrand; Arjen Stroeven; Peter Jansson; Johan Kleman; Jon Landvik; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Scandinavia; Quaternary; Weichselian; mountain; icefield; ice sheet; Physical geography; Naturgeografi;

    Sammanfattning : Mountain centered glaciers have played a major role throughout the last three million years in the Scandinavian mountains. The climatic extremes, like the present warm interglacial or cold glacial maxima, are very short-lived compared to the periods of intermediate climate conditions, characterized by the persistence of mountain based glaciers and ice fields of regional size. LÄS MER

  7. 5. Forest decline in South Central Ethiopia : Extent, history and process

    Författare :Gessesse Dessie; Carl Christiansson; Johan Kleman; Peter Kinlund; Mats Widgren; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Forest decline; people-forest interaction; boundaries; khat expansion; remote sensing; social survey; south central Ethiopia; Awassa watershed; Wondo Genet; Physical geography; Naturgeografi; geografi med naturgeografisk inriktning; Physical Geography;

    Sammanfattning : This study presents the extent, history and process of forest decline in Awassa watershed, south central Ethiopia. By combining different data sources such as satellite images, social surveys and historical documents, forest decline is described quantitatively and qualitatively and the main causes behind this process are identified. LÄS MER