• 175 years of adaptation: North Scandinavian Sámi reindeer herding between government policies and winter climate variability (1835–2010) 

      Riseth, Jan Åge; Tømmervik, Hans; Bjerke, Jarle W. (Journal article; Peer reviewed, 2016)
      Unmanaged wild reindeer populations tend to follow cyclical behaviour, and domesticatedreindeer populations often show cyclical behaviour, too. In this contribution, we intendto use the long-term development of two areas ...
    • Alpine garden plants from six continents show high vulnerability to ice encasement 

      Bjerke, Jarle W.; Elvebakk, Arve; Tømmervik, Hans (Journal article; Peer reviewed, 2017)
      Icy surfaces impose challenges for northern societies, wildlife and agriculture. However, there have been relatively few studies of the impacts of anoxic ground ice on non-agricultural plants. During the winter of 2009–2010, ...
    • Arctic greening from warming promotes declines in caribou populations 

      Fauchald, Per; Park, Taejin; Tømmervik, Hans; Myneni, Ranga B.; Hausner, Vera Helene (Journal article; Peer reviewed, 2017)
      Themigratory tundra caribou herds in North America follow decadal population cycles, and browsing from abundant caribou could be expected to counteract the current climate-driven expansion of shrubs in the circumpolar ...
    • Åborsnes industriområde - Konsekvensutredning, deltema naturmiljø 

      Jacobsen, Karl-Otto; Tømmervik, Hans (NINA Rapport;192, Research report, 2006)
      Jacobsen, K.-O. og Tømmervik, H. 2006. Åborsnes industriområde – Konsekvensutredning, deltema naturmiljø - NINA Rapport 192. 24 s. Det er behov for nye industriarealer i nærområdet til Tromsø. Flere ulike interessenter ...
    • Biologisk mangfold. Bardu kommune 

      Strann, Karl Birger; Frivoll, Vigdis Irene; Iversen, Marianne; Tømmervik, Hans; Johnsen, Trond Vidar (NINA Rapport;58, Research report, 2005)
      Strann, K.-B., Frivoll, V., Iversen, M., Tømmervik, H. & Johnsen, T. 2005. Biologisk mangfold. Bardu kommune - NINA Rapport 58. 165 pp. Stortingsmelding nr. 42 (2000-2001) pålegger den enkelte sektor å gjennomføre ...
    • Bruk av fjernmåling i palsmyrovervåking 

      Lauknes, Tom Rune; Larsen, Yngvar; Høgda, Kjell-Arild; Tømmervik, Hans; Hofgaard, Annika (NINA rapport;803, Research report, 2012)
      Lauknes, T.R., Larsen, Y., Høgda, K.A., Tømmervik, H. & Hofgaard, A. 2012. Bruk av fjernmåling i palsmyrovervåking. – NINA Rapport 803. 38 s. Et fjernmålingsbasert pilotstudium som bruker flybilder, satellittbilder med ...
    • 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 ...
    • Changes in timing of seasonal peak photosynthetic activity in northern ecosystems 

      Park, Taejin; Chen, Chi; Macias-Fauria, Marc; Tømmervik, Hans; Choi, Sungho; Winkler, Alexander; Bhatt, Uma S.; Walker, Donald A.; Piao, Shilong; Brovkin, Victor; Nemani, Ramakrishna R.; Myneni, Ranga B. (Journal article; Peer reviewed, 2019)
      Seasonality in photosynthetic activity is a critical component of seasonal carbon, water and energy cycles in the Earth system. This characteristic is a consequence of plant’s adaptive evolutionary processes to a given set ...
    • Changes in winter warming events in the Nordic Arctic Region 

      Vikhamar-Schuler, Dagrun; Isaksen, Ketil; Haugen, Jan Erik; Tømmervik, Hans; Luks, Bartlomiej; Schuler, Thomas Vikhamar; Bjerke, Jarle W. (Journal article; Peer reviewed, 2016)
      In recent years extreme winter warming events have been reported in arctic areas. These events are characterized as extraordinarily warm weather episodes, occasionally combined with intense rainfall, causing ecological ...
    • Characteristics, drivers and feedbacks of global greening 

      Piao, Shilong; Wang, Xuhui; Park, Taejin; Chen, Chi; Lian, Xu; He, Yue; Bjerke, Jarle W.; Chen, Anping; Ciais, Philippe; Tømmervik, Hans; Nemani, Ramakrishna R.; Myneni, Ranga B. (Peer reviewed, 2019)
    • China and India lead in greening of the world through land-use management 

      Chen, Chi; Park, Taejin; Wang, Xuhui; Piao, Shilong; Xu, Baodong; Chaturvedi, Rajiv K.; Fuchs, Richard; Brovkin, Victor; Ciais, Philippe; Fensholt, Rasmus; Tømmervik, Hans; Bala, Govindasamy; Zhu, Zaichun; Nemani, Ramakrishna R.; Myneni, Ranga B. (Journal article; Peer reviewed, 2019)
      Satellite data show increasing leaf area of vegetation due to direct factors (human land-use management) and indirect factors (such as climate change, CO2 fertilization, nitrogen deposition and recovery from natural ...
    • Complexity revealed in the greening of the Arctic 

      Myers-Smith, Isla H.; Kerby, Jeffrey T.; Phoenix, Gareth K.; Bjerke, Jarle W.; Epstein, Howard E.; Assmann, Jakob J.; John, Christian; Andreu-Hayles, Laia; Angers-Blondin, Sandra; Beck, Pieter S. A.; Berner, Logan T.; Bhatt, Uma S.; Bjorkman, Anne D.; Blok, Daan; Bryn, Anders; Christiansen, Casper Tai; Cornelissen, J. Hans C.; Cunliffe, Andrew M.; Elmendorf, Sarah C.; Forbes, Bruce C.; Goetz, Scott J.; Hollister, Robert D.; de Jong, Rogier; Loranty, Michael M.; Macias-Fauria, Marc; Maseyk, Kadmiel; Normand, Signe; Olofsson, Johan; Parker, Thomas C.; Parmentier, Frans-Jan W.; Post, Eric; Schaepman-Strub, Gabriela; Stordal, Frode; Sullivan, Patrick F.; Thomas, Haydn J.D.; Tømmervik, Hans; Treharne, Rachael; Tweedie, Craig E.; Walker, Donald A.; Wilmking, Martin; Wipf, Sonja (Journal article; Peer reviewed, 2020)
      As the Arctic warms, vegetation is responding, and satellite measures indicate widespread greening at high latitudes. This ‘greening of the Arctic’ is among the world’s most important large-scale ecological responses to ...
    • Development of new metrics to assess and quantify climatic drivers of Extreme event driven Arctic browning 

      Treharne, Rachael; Bjerke, Jarle W.; Tømmervik, Hans; Phoenix, Gareth H. (Journal article, 2020)
      Rapid climate change in Arctic regions is resulting in more frequent extreme climatic events. These can cause large-scale vegetation damage, and are therefore among key drivers of declines in biomass and productivity (or ...
    • Distribution and population characteristics of the soil mites Diapterobates notatus and Svalbardia paludicola (Acari: Oribatida: Ceratozetidae) in High Arctic Svalbard (Norway) 

      Seniczak, Stanislaw; Seniczak, Anna; Graczyk, Radomir; Tømmervik, Hans; Coulson, Stephen James (Journal article; Peer reviewed, 2017)
      The Oribatida of High Arctic Svalbard are faunistically relatively well known, but the distribution, density, stage structure and other population parameters of most species are unknown. Here we focus on two ceratozetid ...
    • E6 Olsborg - Heia, delstrekning 3. Konsekvensanalyse for tema reindrift 

      Langeland, Knut; Danielsen, Inge Even; Tømmervik, Hans (NINA Rapport;1260, Research report, 2016-05-03)
      Langeland, Danielsen, Tømmervik. 2016. E6 Olsborg -Heia, delstrekning 3. Konsekvensanalyse for tema reindrift. NINA rapport 1260. 49 s. Statens vegvesen skal utarbeide reguleringsplan for utbedring av E6 fra Olsborg i ...
    • Ecosystem change and stability over multiple decades in the Swedish subarctic: complex processes and multiple drivers 

      Callaghan, Terry V.; Jonasson, Christer; Thierfelder, Tomas; Yang, Zhenlin; Hedenås, Henrik; Johansson, Margareta; Molau, Ulf; Van Bogaert, Rik; Michelsen, Anders; Olofsson, Johan; Gwynn-Jones, Dylan; Bokhorst, Stef; Phoenix, Gareth K.; Bjerke, Jarle Werner; Tømmervik, Hans; Christensen, Torben R.; Hanna, Edward; Koller, Eva K.; Sloan, Victoria L. (Journal article; Peer reviewed, 2013)
      The subarctic environment of northernmost Sweden has changed over the past century, particularly elements of climate and cryosphere. This paper presents a unique geo-referenced record of environmental and ecosystem ...
    • Ecosystem response to climatic change: the importance of the cold season 

      Bokhorst, Stef; Bjerke, Jarle Werner; Tømmervik, Hans; Preece, Catherine; Phoenix, Gareth K. (Journal article; Peer reviewed, 2012)
      Winter climate and snow cover are the important drivers of plant community development in polar regions. However, the impacts of changing winter climate and associated changes in snow regime have received much less attention ...
    • Feasibility of hyperspectral vegetation indices for the detection of chlorophyll concentration in three high Arctic plants: Salix polaris, Bistorta vivipara, and Dryas octopetala 

      Zagajewski, Bogdan; Kycko, Marlena; Tømmervik, Hans; Bochenek, Zbigniew; Wojtun, Bronislaw; Bjerke, Jarle W.; Klos, Andrzej (Peer reviewed, 2018)
      Remote sensing, which is based on a reflected electromagnetic spectrum, offers a wide range of research methods. It allows for the identification of plant properties, e.g., chlorophyll, but a registered signal not only ...
    • Forsøk med forsterkning og revegetering av kjøretraséer i Porsangmoen - Hálkavárri skytefelt 

      Tømmervik, Hans; Bakkestuen, Vegar; Erikstad, Lars (NINA Rapport;341, Research report, 2008)
      Tømmervik, H., Bakkestuen, V. og Erikstad, L. 2008. Forsøk med forsterkning og revegetering av kjøretraséer i Porsangmoen - Hálkavárri skytefelt. NINA Rapport 341, 35 s. Rapporten oppsummerer forsøk gjort med forsterkning ...