Blar i NIVA Open Access Archive på forfatter "de Wit, Heleen"
-
Recent advances in understanding and measurement of mercury in the environment: Terrestrial Hg cycling
Bishop, Kevin; Shanley, James B.; Riscassi, Ami; de Wit, Heleen; Eklöf, Karin; Meng, Bo; Mitchell, Carl; Osterwalder, Stefan; Schuster, Paul F.; Webster, Jackson; Zhu, Wei (Peer reviewed; Journal article, 2020)This review documents recent advances in terrestrial mercury cycling. Terrestrial mercury (Hg) research has matured in some areas, and is developing rapidly in others. We summarize the state of the science circa 2010 as a ... -
Regional assessment of the current extent of acidification of surface waters in Europe and North America
Austnes, Kari; Aherne, Julian; Arle, Jens; Čičendajeva, Marina; Couture, Suzanne; Fölster, Jens; Garmo, Øyvind Aaberg; Hruska, Jakub; Monteith, Don; Posch, Max; Rogora, Michaela; Sample, James Edward; Skjelkvåle, Brit Lisa; Steingruber, Sandra; Stoddard, John L.; Ulańczyk, Rafał; Van Dam, Herman; Velasco, Manuel Toro; Vuorenmaa, Jussi; Wright, Richard Frederic; de Wit, Heleen (NIVA-rapport;7268, Research report, 2018)The current status of surface water acidification related to air pollution in Europe and North America has been assessed using country reports, monitoring data, critical loads and exceedance data, acid sensitivity and ... -
Response of lake metabolism to catchment inputs inferred using high-frequency lake and stream data from across the northern hemisphere
Corman, Jessica R.; Zwart, Jacob A.; Klug, Jennifer; Bruesewitz, Denise A.; de Eyto, Elvira; Klaus, Marcus; Knoll, Lesley B.; Rusak, James A.; Vanni, Michael J.; Alfonso, María Belén; Fernandez, Rocio Luz; Yao, Huaxia; Austnes, Kari; Couture, Raoul-Marie; de Wit, Heleen; Karlsson, Jan; Laas, Alo (Peer reviewed; Journal article, 2023)In lakes, the rates of gross primary production (GPP), ecosystem respiration (R), and net ecosystem production (NEP) are often controlled by resource availability. Herein, we explore how catchment vs. within lake predictors ... -
Responses of benthic invertebrates to chemical recovery from acidification
Velle, Gaute; Bodin, Christian Lucien; Arle, Jens; Austnes, Kari; Boggero, Angela; Bojkova, Jindriska; Fornaroli, Riccardo; Fölster, Jens; Goedkoop, Willem; Jones, Iwan; Juggins, Steve; Lau, Danny C.P.; Monteith, Don; Murphy, John; Musazzi, Simona; Shilland, Ewan; Steingruber, Sandra; Wiklund, Magda-Lena; de Wit, Heleen (NIVA-rapport;7881-2023, Research report, 2023)The report provides an assessment of biological recovery from acidification in freshwater environments in Europe. The report consists of two parts, a regional data analysis based on an international dataset of biological ... -
Spatial and temporal trends of mercury in freshwater fish in Fennoscandia (1965-2015)
Braaten, Hans Fredrik Veiteberg; Åkerblom, Staffan; de Wit, Heleen; Skotte, Gunnar; Rask, Martti; Vuorenmaa, Jussi; Kahilainen, Kimmo K.; Malinen, Tommi; Rognerud, Sigurd; Lydersen, Espen; Amundsen, Per-Arne; Kashulin, Nicholas; Kashulina, Tatiana; Terentyev, Petr; Christensen, Guttorm; Jackson-Blake, Leah Amber; Lund, Espen; Rosseland, Bjørn Olav (NIVA-rapport;7179, Research report, 2017-09)Mercury (Hg) emissions to the atmosphere cause elevated Hg levels in fish, even in many remote regions of the world. Here we present an extensive database of more than 50 000 measurements of Hg in fish, including 2 775 ... -
Streamwater responses to reduced nitrogen deposition at four small upland catchments in Norway
Kaste, Øyvind; Austnes, Kari; de Wit, Heleen (Peer reviewed; Journal article, 2020)Reduced emissions of nitrogen (N) in Europe have resulted in decreasing atmospheric deposition since 1990. Long-term data (1988–2017) from four small Norwegian catchments located along gradients in N deposition, rainfall, ... -
Trends and patterns in surface water chemistry in Europe and North America between 1990 and 2016, with particular focus on changes in land use as a confounding factor for recovery
Garmo, Øyvind Aaberg; Kaste, Øyvind; Arle, Jens; Austnes, Kari; de Wit, Heleen; Fölster, Jens; Houle, Daniel; Hruska, Jakub; Indriksone, Iveta; Monteith, Don; Rogora, Michaela; Sample, James Edward; Steingruber, Sandra; Stoddard, John L.; Talkop, Reet; Trodd, Wayne; Ulańczyk, Rafał Piotr; Vuorenmaa, Jussi (NIVA-rapport;7479, Research report, 2020)The report presents trends in sulphate, nitrate, chloride, base cations, ANC (acid neutralising capacity), pH and DOC at circa 500 ICP Waters sites in Europe and North America for the period 1990-2016. Time series were ... -
Trends and patterns in surface water chemistry in Europe and North America between 1990 and 2020, with a focus on calcium
Vogt, Rolf David; Agnieszka, Kolada; Arle, Jens; Austnes, Kari; Van Dam, Herman; Futter, Martyn; Fölster, Jens; Gundersen, Cathrine Brecke; Higgins, Scott N.; Houle, Daniel; Hruska, Jakub; Monteith, Don; Paterson, Andrew; Rogora, Michela; Sample, James Edward; Stoddard, John; Steingruber, Sandra; Ulanczyk, Rafak; Vuorenmaa, Jussi; de Wit, Heleen (NIVA-rapport;7931-2024, Research report, 2024)The report presents trends in major anions and cations, pH, TOC and bicarbonate in surface waters in Europe and North America from 1990 to 2020. Special attention is given to trends in calcium, which showed some unexpected ... -
Trends in ecosystem and health responses to long-rangetransported atmospheric pollutants - ICP Waters report125/2015
de Wit, Heleen; Hettelingh, Jean-Paul; Harmens, Harry (NIVA-rapport;6946, Research report, 2015)The aim of this trend report is to assess the effectiveness of air pollution policies under the Convention on Long-range Transboundary Air Pollution (LRTAP), and to document progress and identify remaining challenges. ... -
Trends in surface water chemistry in acidified areas in Europe and North America from 1990 to 2008
Garmo, Øyvind Aaberg; Skjelkvåle, Brit Lisa; de Wit, Heleen; Colombo, Luca; Curtis, Chris; Fölster, Jens; Hoffmann, Andreas; Hruška, Jakub; Høgåsen, Tore; Jeffries, Dean S.; Keller, W. Bill; Krám, Pavel; Majer, Vladimir; Monteith, Don T.; Paterson, Andrew M.; Rogora, Michela; Rzychon, Dorota; Steingruber, Sandra; Stoddard, John L.; Vuorenmaa, Jussi; Worsztynowicz, Adam (Journal article; Peer reviewed, 2014)Acidification of lakes and rivers is still an environmental concern despite reduced emissions of acidifying compounds. We analysed trends in surface water chemistry of 173 acid-sensitive sites from 12 regions in Europe and ... -
Widespread diminishing anthropogenic effects on calcium in freshwaters
Weyhenmeyer, Gesa A; Hartmann, Jens; Hessen, Dag Olav; Kopáček, Jiří; Hejzlar, Josef; Jacquet, Stéphan; Hamilton, Stephen K.; Verburg, Piet; Leach, Taylor H.; Schmid, Martin; Flaim, Giovanna; Nõges, Tiina; Nõges, Peeter; Wentzky, Valerie C.; Rogora, Michela; Rusak, James A.; Kosten, Sarian; Paterson, Andrew M.; Teubner, Katrin; Higgins, Scott N.; Lawrence, Gregory; Kangur, Külli; Kokorite, Ilga; Cerasino, Leonardo; Funk, Clara; Harvey, Rebecca; Moatar, Florentina; de Wit, Heleen; Zechmeister, Thomas (Journal article; Peer reviewed, 2019)Calcium (Ca) is an essential element for almost all living organisms. Here, we examined global variation and controls of freshwater Ca concentrations, using 440 599 water samples from 43 184 inland water sites in 57 ...