Now showing items 1-15 of 15

  • Aalstad, Kristoffer; Westermann, Sebastian; Schuler, Thomas; Boike, Julia; Bertino, Laurent (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    With its high albedo, low thermal conductivity and large water storing capacity, snow strongly modulates the surface energy and water balance, which makes it a critical factor in mid- to high-latitude and mountain en- ...
  • Aalstad, Kristoffer (Doctoral thesis / Doktoravhandling, 2019)
    This thesis presents a satellite-based modeling framework that can estimate how much snow was stored in the terrain. These estimates can help guide climate analysis and prediction. Accurate quantification of Earth’s snow ...
  • Aalstad, Kristoffer; Westermann, Sebastian; Bertino, Laurent (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The seasonal snow-cover is one of the most rapidly varying natural surface features on Earth. It strongly modulates the terrestrial water, energy, and carbon balance. Fractional snow-covered area (fSCA) is an essential ...
  • Fiddes, Joel; Aalstad, Kristoffer; Westermann, Sebastian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Spatial variability in high-relief landscapes is immense, and grid-based models cannot be run at spatial resolutions to explicitly represent important physical processes. This hampers the assessment of the current and ...
  • Pirk, Norbert; Aalstad, Kristoffer; Westermann, Sebastian; Vatne, Astrid; van Hove, Alouette; Tallaksen, Lena Merete; Cassiani, Massimo; Katul, Gabriel G. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract. Spatially representative estimates of surface energy exchange from field measurements are required for improving and validating Earth system models and satellite remote sensing algorithms. The scarcity of flux ...
  • Yilmaz, Yeliz; Aalstad, Kristoffer; Sen, Omer L. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The snow-fed river basins of the Near East region are facing an urgent threat in the form of declining water resources. In this study, we analyzed several remote sensing products (optical, passive microwave, and gravimetric) ...
  • Renette, Cas; Aalstad, Kristoffer; Aga, Juditha; Zweigel, Robin Benjamin; Etzelmüller, Bernd; Lilleøren, Karianne Staalesen; Isaksen, Ketil; Westermann, Sebastian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract. Ground temperatures in coarse, blocky deposits such as mountain blockfields and rock glaciers have long been observed to be lower in comparison with other (sub)surface material. One of the reasons for this negative ...
  • Pirk, Norbert; Aalstad, Kristoffer; A. Yilmaz, Yeliz; Vatne, Astrid; Popp, Andrea L.; Horvath, Peter; Bryn, Anders; Vollsnes, Ane Victoria; Westermann, Sebastian; Berntsen, Terje Koren; Stordal, Frode; Tallaksen, Lena M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract. The interannual variability of snow cover in alpine areas is increasing, which may affect the tightly coupled cycles of carbon and water through snow–vegetation–atmosphere interactions across a range of spatio-temporal ...
  • Alonso-Gonzalez, Esteban; Gutmann, Ethan; Aalstad, Kristoffer; Fayad, Abbas; Bouchet, Marine; Gascoin, Simon (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    The snowpack over the Mediterranean mountains constitutes a key water resource for the downstream populations. However, its dynamics have not been studied in detail yet in many areas, mostly because of the scarcity of ...
  • Alonso-Gonzalez, Esteban; Aalstad, Kristoffer; Pirk, Norbert; Mazzolini, Marco; Treichler, Désirée; Leclercq, Paul; Westermann, Sebastian; Lopez-Moreno, Juan I; Gascoin, Simon (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Data assimilation techniques that integrate available observations with snow models have been proposed as a viable option to simultaneously help constrain model uncertainty and add value to observations by improving estimates ...
  • Westermann, Sebastian; Ingeman-Nielsen, Thomas; Scheer, Johanna; Aalstad, Kristoffer; Aga, Juditha; Chaudhary, Nitin; Etzelmüller, Bernd; Filhol, Simon; Kääb, Andreas; Renette, Cas; Schmidt, Louise Steffensen; Schuler, Thomas; Zweigel, Robin Benjamin; Martin, Leo Celestin Paul; Morard, Sarah; Ben-Asher, Matan; Angelopoulos, Michael; Boike, Julia; Groenke, Brian; Miesner, Frederieke; Nitzbon, Jan; Overduin, Paul; Stuenzi, Simone M.; Langer, Moritz (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    The CryoGrid community model is a flexible toolbox for simulating the ground thermal regime and the ice–water balance for permafrost and glaciers, extending a well-established suite of permafrost models (CryoGrid 1, 2, and ...
  • Alonso-Gonzalez, Esteban; Aalstad, Kristoffer; Baba, Mohamed Wassim; Revuelto, Jesus; Lopez-Moreno, Juan I; Fiddes, Joel; Essery, Richard; Gascoin, Simon (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract. Accurate knowledge of the seasonal snow distribution is vital in several domains including ecology, water resources management, and tourism. Current spaceborne sensors provide a useful but incomplete description ...
  • Fiddes, Joel; Aalstad, Kristoffer; Lehning, Michael (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    This study describes and evaluates a new down-scaling scheme that specifically addresses the need for hillslope-scale atmospheric-forcing time series for modelling the local impact of regional climate change projections ...
  • Filhol, Simon; Fiddes, Joel; Aalstad, Kristoffer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Global climate reanalyses and projections are available worldwide for the past and coming century. However, model grids remain too coarse to be directly relevant at the hillslope-scale (Fan et al., 2019), requiring adapted ...
  • van Hove, Alouette; Aalstad, Kristoffer; Pirk, Norbert (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Accurate mapping of greenhouse gas fluxes at the Earth’s surface is essential for the validation and calibration of climate models. In this study, we present a framework for surface flux estimation with drones. Our approach ...