Sökning: "LPJ-GUESS"

Visar resultat 1 - 5 av 19 uppsatser innehållade ordet LPJ-GUESS.

  1. 1. Snow insulation effects across the Arctic : evaluating a revised snow module in LPJ-GUESS

    Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Alexandra Pongrácz; [2019]
    Nyckelord :active layer depth; Arctic; LPJ-GUESS; snow; soil temperature; Earth and Environmental Sciences;

    Sammanfattning : The effect of future changes in temperature and precipitation patterns on arctic ecosystem functioning is often assessed using state-of-the-art ecosystem models. Many models however lack detailed representation of wintertime processes, as pointed out by recent studies (Wang et al. 2016, Slater and Lawrence 2013). LÄS MER

  2. 2. Implications of a dynamic vertical root distribution for modelled water and carbon fluxes across selected ecosystems : incorporating a novel rooting scheme into LPJ-GUESS

    Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Lasse Keetz; [2019]
    Nyckelord :Physical Geography and Ecosystem Analysis; Ecosystem Modelling; LPJ-GUESS; Vertical Root Distribution; Dynamic Root Distribution; Carbon and Water Fluxes; Earth and Environmental Sciences;

    Sammanfattning : Roots play a key role in terrestrial carbon and water cycles, and therefore for the global climate system. They mediate plant evapotranspiration, influence photosynthetic processes and are responsible for atmospheric carbon transport into the pedosphere. Fine roots, in particular, are chiefly regulating water and nutrient uptake. LÄS MER

  3. 3. Modelling global Gross Primary Production using the correlation between key leaf traits

    Kandidat-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Alexandra Pongrácz; [2017]
    Nyckelord :ecosystem modelling; leaf longevity; leaf nitrogen content; leaf mass per area; LEIA; LPJ-GUESS; GPP; terrestrial biosphere; Earth and Environmental Sciences; Biology and Life Sciences;

    Sammanfattning : Sophisticated ecosystem models make it possible to evaluate the potential future changes of the carbon sequestration capacity of the terrestrial biosphere, as a response to the rapid environmental and climatic changes. Accuracy of model estimates is however strongly dependent on the parametrisation of driving parameters. LÄS MER

  4. 4. Can the introduction of the topographic indices in LPJ-GUESS improve the spatial representation of environmental variables?

    Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Alejandra Narváez Vallejo; [2016]
    Nyckelord :smooth topography; drainage area; slope; topographic wetness index; LPJ-GUESS; GIS; physical geography and ecosystem analysis; geography; geographic information systems; leaf area index; spatial patterns; MODIS LAI.; Earth and Environmental Sciences;

    Sammanfattning : Ecosystem modelling is an always evolving science trying to catch the complexity of the nature and its principles to model environmental responses in a realistic way. Over and over, models try to introduce more variables and interactions to achieve better representations of phenomena of interest like the responses of the ecosystem to a fast changing world (climate change, land use change). LÄS MER

  5. 5. Organic farming’s role in adaptation to and mitigation of climate change : an overview of ecological resilience and a model case study

    Kandidat-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Gusten Brodin; [2016]
    Nyckelord :sustainable agriculture; soil carbon sequestration; organic farming; climate change resilience; LPJ-GUESS; Physical Geography and Ecosystem Science; Earth and Environmental Sciences;

    Sammanfattning : Agriculture is essential for human survival and today it faces many problems related to both climate change and an increasing population. While increased total yields during the 20th century have created the conditions for both global economic and population growth, the agricultural practices utilized have often had detrimental consequences both for ecosystems and people. LÄS MER