• Changes in greening in the High Arctic - insights from a 30-year AVHRR max NDVI dataset for Svalbard 

      Vickers, Hannah; Høgda, Kjell Arild; Solbø, Stian; Karlsen, Stein Rune; Tømmervik, Hans; Aanes, Ronny; Hansen, Brage Bremset (Journal article; Peer reviewed, 2016)
      Satellite-aided studies of vegetation cover, biomass and productivity are becoming increasingly important formonitoring the effects of a changing climate on the biosphere. With their large spatial coverage and good temporal ...
    • Changes in growing season duration and productivity of northern vegetation inferred from long-term remote sensing data 

      Park, Taejin; Ganguly, Sangram; Tømmervik, Hans; Euskirchen, Eugénie S.; Høgda, Kjell Arild; Karlsen, Stein Rune; Brovkin, Victor; Nemani, Ramakrishna R.; Myneni, Ranga B. (Journal article; Peer reviewed, 2016)
      Monitoring and understanding climate-induced changes in the boreal and arctic vegetation is critical to aid in prognosticating their future.Weused a 33 year (1982–2014) long record of satellite observations to robustly ...
    • Future forest distribution on Finnmarksvidda, North Norway 

      Karlsen, Stein Rune; Tømmervik, Hans; Johansen, Bernt; Riseth, Jan Åge (Journal article; Peer reviewed, 2017)
      Finnmarksvidda is Norway’s largest mountain plateau, located in the Arctic/alpineboreal transition area. The area is also a central winter grazing area for the reindeer herds of the indigenous Sámi people. This study ...
    • Overvåking av vinterbeiter i Indre Finnmark 2013. Resultater fra feltrutene 

      Tømmervik, Hans; Bjerke, Jarle W.; Laustsen, K*; Johansen, Bernt; Karlsen, Stein Rune (NINA Rapport;1066, Research report, 2014)
      Dát raporta lea joatkka 1998:s álggahuvvon ”Sis-Finnmárkku goziheapmi” mii čuovvoluvvui fealttas sihke 2005/2006 ja 2010. Dát raporta lea fealtaiskkademiid vuođul mat dahkkojuvvojedje 2013:s ja sisttisdollet eananregistreremiid ...
    • Record-low primary productivity and highplant damage in the Nordic Arctic Region in2012 caused by multiple weather events andpest outbreaks 

      Bjerke, Jarle W.; Karlsen, Stein Rune; Høgda, Kjell Arild; Malnes, Eirik; Jepsen, Jane Uhd; Lovibond, Sarah; Vikhamar-Schuler, Dagrun; Tømmervik, Hans (Peer reviewed, 2014)
      The release of cold temperature constraints on photosynthesis has led to increased productivity (greening) in significant parts (32–39%) of the Arctic, but much of the Arctic shows stable (57–64%) or reduced productivity ...
    • Snow season variability in a boreal-Arctic transition area monitored by MODIS data 

      Malnes, Eirik; Karlsen, Stein Rune; Johansen, Bernt; Bjerke, Jarle W.; Tømmervik, Hans (Journal article; Peer reviewed, 2016)
      The duration and extent of snow cover is expected to change rapidly with climate change. Therefore, there is a need for improved monitoring of snow for the benefit of forecasting, impact assessments and the population ...
    • Trends in the start of the growing season in Fennoscandia 1982–2011 

      Høgda, Kjell Arild; Tømmervik, Hans; Karlsen, Stein Rune (Journal article; Peer reviewed, 2013)
      Global temperature is increasing, and this is affecting the vegetation phenology in many parts of the world. In Fennoscandia, as well as Northern Europe, the advances of phenological events in spring have been recorded in ...
    • Tundra greenness 

      Epstein, H.; Bhatt, U.; Raynolds, M.; Walker, D.; Forbes, B.; Phoenix, G.; Bjerke, Jarle W.; Tømmervik, Hans; Karlsen, Stein Rune; Myneni, R.; Park, T.; Goetz, S.; Jia, G. (Chapter, 2018)
    • Tundra greenness 

      Epstein, H.; Bhatt, U.S.; Raynolds, M.K.; Walker, D.A.; Forbes, B.C.; Phoenix, G.K.; Bjerke, Jarle W.; Tømmervik, Hans; Karlsen, Stein Rune; Myneni, R.; Park, T.; Goetz, S.; Jia, G. (Peer reviewed, 2019)
    • Using ordinary digital cameras in place of near-infrared sensors to derive vegetation indices for phenology studies of high arctic vegetation 

      Anderson, Helen; Nilsen, Lennart; Tømmervik, Hans; Karlsen, Stein Rune; Nagai, Shin; Cooper, Elisabeth J. (Journal article; Peer reviewed, 2016)
      To remotely monitor vegetation at temporal and spatial resolutions unobtainable with satellite-based systems, near remote sensing systems must be employed. To this extent we used Normalized Difference Vegetation Index ...
    • Vegetasjonskart over Svalbard basert på satellittdata. Dokumentasjon av metoder og vegetasjonsbeskrivelser 

      Johansen, Bernt; Tømmervik, Hans; Karlsen, Stein Rune (NINA Rapport;456, Research report, 2009)
      Johansen, B., Tømmervik, H. & Karlsen, S.R. 2009. Vegetasjonskart over Svalbard basert på satellittdata. Dokumentasjon av metoder og vegetasjonsbeskrivelser. NINA Rapport 456. 54 s. I plantegeografisk sammenheng inndeles ...