• A carbon balance of Norway: terrestrial and aquatic carbon fluxes 

      de Wit, Heleen; Austnes, Kari; Hylen, Gro; Dalsgaard, Lise (Journal article; Peer reviewed, 2015)
      Northern landscapes accumulate carbon in vegetation and soils while rivers transport significant amounts of land-derived carbon to coastal areas. Here, we quantify carbon sources and sinks in main ecosystems (forests, ...
    • A new broad typology for rivers and lakes in Europe: Development and application for large-scale environmental assessments 

      Solheim, Anne Lyche; Globevnik, Lidija; Austnes, Kari; Kristensen, Peter; Moe, S. Jannicke; Persson, Jonas; Phillips, Geoff; Poikane, Sandra; van de Bund, Wouter; Birk, Sebastian (Journal article; Peer reviewed, 2019)
      European countries have defined >1000 national river types and >400 national lake types to implement the EU Water Framework Directive (WFD). In addition, common river and lake types have been defined within regions of ...
    • Cleaner air reveals growing influence of climate on dissolved organic carbon trends in northern headwaters 

      de Wit, Heleen; Stoddard, John L.; Monteith, Donald T.; Sample, James E.; Austnes, Kari; Couture, Suzanne; Fölster, Jens; Higgins, Scott N.; Houle, Daniel; Hruška, Jakub; Krám, Pavel; Kopáček, Jiří; Paterson, Andrew M.; Valinia, Salar; Van Dam, Herman; Vuorenmaa, Jussi; Evans, Chris D. (Peer reviewed; Journal article, 2021)
      Surface water browning, the result of increasing concentrations of dissolved organic matter (DOM), has been widespread in northern ecosystems in recent decades. Here, we assess a database of 426 undisturbed headwater lakes ...
    • Critical limits for surface water acidification in Norwegian critical loads calculation and Water Framework Directive classification 

      Austnes, Kari; Lund, Espen (NIVA-rapport;6741, Research report, 2014)
      The objective of this study was to compare the critical limits for surface water acidification used in the critical loads calculation under the UNECE Convention on Long-range Transboundary Air Pollution and the EU Water ...
    • Critical loads and the MAGIC model. Evaluating the country-scale applications in Norway using data from the 2019 national lake survey 

      Austnes, Kari; Wright, Richard Frederic; Sample, James Edward; Clayer, Francois (NIVA-rapport;7557, Research report, 2020)
      The critical loads methodology used at the national scale in Norway and the MAGIC model as applied to the lakes in the national 1000-lake survey have been evaluated, making use of the data from the 2019 national lake survey. ...
    • Current Browning of Surface Waters Will Be Further Promoted by Wetter Climate 

      de Wit, Heleen A.; Valinia, Salar; Weyhenmeyer, Gesa A; Futter, Martyn N.; Kortelainen, Pirkko; Austnes, Kari; Hessen, Dag O; Raike, Antti; Laudon, Hjalmar; Vournenmaa, Jussi (Journal article; Peer reviewed, 2016)
      Browning of surface waters because of increasing terrestrial dissolved organic carbon (OC) concentrations is a concern for drinking water providers and can impact land carbon storage. We show that positive trends in OC in ...
    • Currently legislated decreases in nitrogen deposition will yield only limited plant species recovery in European forests 

      Dirnböck, Thomas; Pröll, Gisela; Austnes, Kari; Beloica, Jelena; Beudert, Burkhard; Canullo, Robert; De Marco, Alessandra; Fornasier, Maria Francesca; Futter, Martyn; Goergen, Klaus; Grandin, Ulf; Holmberg, Maria; Lindroos, Antti-Jussi; Mirtl, Michael; Neirynck, Johan; Pecka, Tomasz; Nieminen, Tiina Maileena; Nordbakken, Jørn-Frode; Posch, Maximilian; Reinds, Gert-Jan; Rowe, Edwin C; Salemaa, Maija; Scheuschner, Thomas; Starlinger, Franz; Uzieblo, Aldona Katarzyna; Valinia, Salar; Weldon, James; Wamelink, Wieger G W; Forsius, Martin (Journal article; Peer reviewed, 2018)
      Atmospheric nitrogen (N) pollution is considered responsible for a substantial decline in plant species richness and for altered community structures in terrestrial habitats worldwide. Nitrogen affects habitats through ...
    • Effects of nitrogen on nutrient-limitation in oligotrophic northern surface waters 

      Thrane, Jan-Erik; de Wit, Heleen; Austnes, Kari (NIVA-rapport;7680, Research report, 2021)
      Nitrogen deposition has a potentially eutrophying impact on oligotrophic freshwaters. Here we present a data analysis and a literature review with a joint focus on nitrogen (N) limitation in oligotrophic lakes and rivers. ...
    • Modellbasert klassifisering av forsuringstilstand i innsjøer uten måledata 

      Austnes, Kari; Lund, Espen; Valinia, Salar; Cosby, Bernard J. (NIVA-rapport;7047, Research report, 2016)
      Formålet med dette arbeidet var å utarbeide en områdebasert klassifisering, som kan benyttes til klassifisering av forsuringstilstand i norske innsjøer uten måledata. Områdeklassifiseringen ble basert på modellering av 990 ...
    • Modelling study of soil C, N and pH response to air pollution and climate change using European LTER site observations 

      Holmberg, Maria; Aherne, Julian; Austnes, Kari; Beloica, Jelena; De Marco, Alessandra; Dirnböck, Thomas; Fornasier, Maria Francesca; Goergen, Klaus; Futter, Martyn; Lindroos, Antti-Jussi; Krám, Pavel; Neirynck, Johan; Nieminen, Tiina Maileena; Pecka, Tomasz; Posch, Maximilian; Pröll, Gisela; Rowe, Ed C.; Scheuschner, Thomas; Schlutow, Angela; Valinia, Salar; Forsius, Martin (Journal article; Peer reviewed, 2018)
      Current climate warming is expected to continue in coming decades, whereas high N deposition may stabilize, in contrast to the clear decrease in S deposition. These pressures have distinctive regional patterns and their ...
    • Nasjonal innsjøundersøkelse 2019 

      Hindar, Atle; Garmo, Øyvind Aaberg; Austnes, Kari; Sample, James Edward (NIVA-rapport;7530, Research report, 2020)
      I denne nasjonale innsjøundersøkelsen er forsuring og eutrofiering undersøkt i 1000 innsjøer. De aller fleste av innsjøene ble prøvetatt fra helikopter i perioden 15. september og ut oktober i 2019, og det er analysert på ...
    • Nitrogen in surface waters: time trends and geographical patterns explained by deposition levels and catchment characteristics 

      Austnes, Kari; Hjermann, Dag Øystein; Sample, James Edward; Wright, Richard Frederic; Kaste, Øyvind; de Wit, Heleen (NIVA-rapport;7728-2022, Research report, 2022)
      The report presents a statistical analysis of controls (deposition, land cover, climate) on spatial variability and long-term trends (1992-2016) in surface water concentrations of nitrate (NO3) and carbon to nitrogen (C/N) ...
    • Organic nitrogen steadily increasing in Norwegian rivers draining to the Skagerrak coast 

      Deininger, Anne; Kaste, Øyvind; Frigstad, Helene; Austnes, Kari (Peer reviewed; Journal article, 2020)
      Declining atmospheric nitrogen (N) deposition, through reduction in the direct input of inorganic N, may result in less inorganic N being leached from soils to freshwaters (dissolved inorganic N = DIN). Declining sulphur ...
    • Overskridelser av tålegrenser for forsuring og nitrogen for Norge. Oppdatering med perioden 2012–2016 

      Austnes, Kari; Lund, Espen; Sample, James Edward; Aarrestad, Per Arild; Bakkestuen, Vegar; Aas, Wenche (NIVA-rapport;7239, Research report, 2018)
      Rapporten viser overskridelser av tålegrenser for forsuring av vann og jord, samt overgjødslingseffekter på vegetasjon, med avsetningsverdier for perioden 2012–2016. Det er kun en liten reduksjon i areal med overskridelse ...
    • Pipes or chimneys? For carbon cycling in small boreal lakes, precipitation matters most 

      de Wit, Heleen A; Couture, Raoul-Marie; Jackson-Blake, Leah; Futter, Martyn N.; Valinia, Salar; Austnes, Kari; Guerrero, Jose-Luis; Lin, Yan (Journal article; Peer reviewed, 2018)
      Are small lakes passive pipes transporting terrigenous organic carbon (dissolved organic carbon [DOC]), or chimneys for CO2 release in the landscape? Using a unique combination of 30‐yr measurements, sediment dating and ...
    • Proceedings of the 35th Task Force meeting of the ICP Waters Programme in Helsinki, June 4-6, 2019 

      Garmo, Øyvind Aaberg; Austnes, Kari; Vuorenmaa, Jussi (NIVA-rapport;7437-2019, Research report, 2019)
      Proceedings of the 35th Task Force meeting of the ICP Waters Programme in Helsinki, June 4-6, 2019. National contributions from Russia.
    • Proceedings of the 37th Task Force meeting of the ICP Waters Programme, held on-line, April 28-29, 2021 

      Garmo, Øyvind Aaberg; Furuseth, Ingvild Skumlien; Austnes, Kari (NIVA-rapport;7657, Research report, 2021)
      Proceedings of the 37th Task Force meeting of the ICP Waters Programme held on-line, April 28-29, 2021. National contributions from Italy.
    • Proceedings of the 38th meeting of the ICP Waters Programme in Miraflores de la Sierra, Spain, and on-line, May 10-12, 2022 

      Furuseth, Ingvild Skumlien; Velasco, Manuel Toro; Austnes, Kari (NIVA-rapport;7783-2022, Research report, 2022)
      Proceedings of the 38th Task Force meeting of the ICP Waters Programme held in Miraflores de la Sierra, Spain, and online, May 10-12, 2022. National contributions from Czech Republic and Spain.
    • Re-calibration of the MAGIC model with data from the National Lake Survey 2019. 

      Kaste, Øyvind; Norling, Magnus Dahler; Austnes, Kari; Cosby, Bernard J.; Wright, Richard Frederic (NIVA-rapport;7799-2022, Research report, 2022)
      The MAGIC model (Model for Acidification of Groundwater In Catchments) was calibrated to the Norwegian 1000-lake survey data from both 1995 and 2019. The re-survey in 2019 provided a new point in time for generation of new ...
    • Re-calibration of the MAGIC model with data from the National Lake Survey 2019. Results from phase 2 

      Kaste, Øyvind; Norling, Magnus Dahler; Balkoni, Areti; Austnes, Kari; Cosby, Bernard J.; Wright, Richard F. (NIVA-rapport;7915-2023, Research report, 2023)
      The biogeochemical MAGIC model has been applied to the data from the 1995 and 2019 surveys of 1000 Norwegian lakes. The work is a follow-up of a modelling exercise that was done in 2022, with improved input data and with ...