Blar i NIVA Open Access Archive på forfatter "de Wit, Heleen A"
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Aquatic DOC export from subarctic Atlantic blanket bog in Norway is controlled by seasalt deposition, temperature and precipitation
de Wit, Heleen A; Ledesma, Jose L J; Futter, Martyn N. (Journal article; Peer reviewed, 2016)Comprehensive and credible peatland carbon budgets, needed for global carbon accounting, must include lateral aquatic organic carbon export. Here, we quantify aquatic dissolved organic carbon (DOC) export for an Atlantic ... -
Growth responses of the nuisance algae Gonyostomum semen (Raphidophyceae) to DOC and associated alterations of light quality and quantity
Hagman, Camilla Hedlund Corneliussen; Skjelbred, Birger; Thrane, Jan-Erik; Andersen, Tom; de Wit, Heleen A (Journal article; Peer reviewed, 2019)In recent decades, the freshwater alga Gonyostomum semen (Ehrenberg) Diesing has increased in abundance and distribution, which has created problems regarding the use of lakes for drinking water and recreation. Increases ... -
Land-use dominates climate controls on nitrogen and phosphorus export from managed and natural Nordic headwater catchments
de Wit, Heleen A; Lepistö, Ahti; Marttila, Hannu; Wenng, Hannah; Bechmann, Marianne; Blicher-Mathiesen, Gitte; Eklöf, Karin; Futter, Martyn N.; Kortelainen, Pirkko; Kronvang, Brian; Kyllmar, Katarina; Rakovic, Jelena (Peer reviewed; Journal article, 2020)Agricultural, forestry‐impacted and natural catchments are all vectors of nutrient loading in the Nordic countries. Here, we present concentrations and fluxes of total nitrogen (totN) and phosphorus (totP) from 69 Nordic ... -
Long-term changes (1990–2015) in the atmospheric deposition and runoff water chemistry of sulphate, inorganic nitrogen and acidity for forested catchments in Europe in relation to changes in emissions and hydrometeorological conditions
Vuorenmaa, Jussi; Augustaitis, Algirdas; Beudert, Burkhard; Bochenek, Witold; Clarke, Nicholas; de Wit, Heleen A; Dirnböck, Thomas; Frey, Jane; Hakola, Hannele; Kleemola, Sirpa; Kobler, Johannes; Krám, Pavel; Lindroos, Antti-Jussi; Lundin, Lars; Löfgren, Stefan; Marchetto, Aldo; Pecka, Tomasz; Schulte-Bisping, Hubert; Skotak, Krzysztof; Srybny, Anatoly; Szpikowski, Józef; Ukonmaanaho, Liisa; Váňa, Milan; Åkerblom, Staffan; Forsius, Martin (Journal article; Peer reviewed, 2018)The international Long-Term Ecological Research Network (ILTER) encompasses hundreds of long-term research/monitoring sites located in a wide array of ecosystems that can help us understand environmental change across the ... -
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 ... -
Reduced Acid Deposition Leads to a New Start for Brown Trout (Salmo trutta) in an Acidified Lake in Southern Norway
Lund, Espen; Garmo, Øyvind A; de Wit, Heleen A; Kristensen, Torstein; Hawley, Kate L; Wright, Richard F (Journal article; Peer reviewed, 2018)Acid deposition has led to acidification and loss of fish populations in thousands of lakes and streams in Norway. Since the peak in the late 1970s, acid deposition has been greatly reduced and acidified surface waters ...