Ansatt bilde
Heleen de Wit
dr.scient. (PhD)
Stilling: Seniorforsker, ph.d.
Telefon: 95434360
Seksjon: Nedbørfeltprosesser
Heleen de Wit har en PhD (2000) fra Landbruksuniversitet i Ås og har jobbet på NIVA siden 2004.
Hun forsker på nedbørfeltprosesser i naturlige økosystemer, i forbindelse med lufttransport forurensing (sur nedbør og kvikksølv). Dette er viktig for forsuring og forurensing av overflatevann, og påvirkes av klimaendring og direkte inngrep i nedbørfeltet som skoghogst. Hun benytter overvåkingsdata fra Norge og andre land for å se på langtidstrender i nitrogen og løst organisk materiale i vann (se www.icp-waters.no). En annen interesse er karbonlagring og utvasking i terrestre økosystemer.

Vitenskapelige artikler og bokkapitler

  1. Vuorenmaa, Jussi; Augustaitis, Algirdas; Beudert, Burkhard; Clarke, Nicholas; de Wit, Heleen; Dirnböck, Thomas; Frey, Jane; Forsius, Martin; Indriksone, Iveta; Kleemola, Sirpa; Kobler, Johannes; Kram, Pavel; Lindroos, Antti-Jussi; Lundin, Lars; Ruoho-Airola, Tuija; Ukonmaanaho, Liisa; Vána, Milan (2017) Long-term sulphate and inorganic nitrogen mass balance budgets in European ICP Integrated Monitoring catchments (1990–2012) Ecological Indicators ISSN 1470-160X. Vol 76 s 15 - 29 doi: 10.1016/j.ecolind.2016.12.040
  2. Finstad, Anders Gravbrøt; Andersen, Tom; Larsen, Søren; Tominaga, Koji; Blumentrath, Stefan; de Wit, Heleen A.; Tømmervik, Hans; Hessen, Dag Olav (2016) From greening to browning: Catchment vegetation development and reduced S-deposition promote organic carbon load on decadal time scales in Nordic lakes Scientific Reports ISSN 2045-2322. Vol 6 doi: 10.1038/srep31944
  3. Strand, Line Tau; Callesen, Ingeborg; Dalsgaard, Lise; de Wit, Heleen A (2016) Carbon and nitrogen stocks in Norwegian forest soils — the importance of soil formation, climate, and vegetation type for organic matter accumulation Canadian Journal of Forest Research ISSN 0045-5067. Vol 46 No 12 s 1459 - 1473 doi: 10.1139/cjfr-2015-0467
  4. de Wit, Heleen A; Ledesma, Jose L J; Futter, Martyn N. (2016) Aquatic DOC export from subarctic Atlantic blanket bog in Norway is controlled by seasalt deposition, temperature and precipitation Biogeochemistry ISSN 0168-2563. Vol 127 No 2 s 305 - 321 doi: 10.1007/s10533-016-0182-z
  5. 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 (2016) Current Browning of Surface Waters Will Be Further Promoted by Wetter Climate Environmental Science and Technology Letters ISSN 2328-8930. Vol 3 No 12 s 430 - 435 doi: 10.1021/acs.estlett.6b00396
  6. Braaten, Hans Fredrik Veiteberg; de Wit, Heleen A. (2016) Effects of disturbance and vegetation type on total and methylmercury in boreal peatland and forest soils Environmental Pollution ISSN 0269-7491. Vol 218 s 140 - 149 doi: 10.1016/j.envpol.2016.08.029
  7. Vries, Wim de; Posch, Maximilian; Sverdrup, Harald U.; Larssen, Thorjørn; Wit, Heleen de; Bobbink, Roland; Hettelingh, Jean-Paul (2015) Geochemical Indicators for Use in the Computation of Critical Loads and Dynamic Risk Assessments Environmental Pollution ISSN 1566-0745. Vol 25 s 15 - 58 doi: 10.1007/978-94-017-9508-1_2
  8. Couture, Raoul-Marie; de Wit, Heleen; Tominaga, Koji; Kiuru, Petri; Markelov, Igor (2015) Oxygen dynamics in a boreal lake responds to long-term changes in climate, ice phenology, and DOC inputs Journal of Geophysical Research - Biogeosciences ISSN 2169-8953. Vol 120 No 11 s 2441 - 2456 doi: 10.1002/2015JG003065
  9. Moiseenko, Tatiana Ivanovna; Dinu, Marina Ivanovna; Bazova, Maria Mihailovna; de Wit, Heleen (2015) Long-term changes in the water chemistry of arctic lakes as a response to reduction of air pollution: Case study in the Kola, Russia Water, Air and Soil Pollution ISSN 0049-6979. Vol 226 No 98 doi: 10.1007/s11270-015-2310-0
  10. de Wit, Heleen; Austnes, Kari; Hylen, Gro; Dalsgaard, Lise (2015) A carbon balance of Norway: terrestrial and aquatic carbon fluxes Biogeochemistry ISSN 0168-2563. Vol 123 s 147 - 173 doi: 10.1007/s10533-014-0060-5
  11. Poste, Amanda; Braaten, Hans Fredrik Veiteberg; de Wit, Heleen; Sørensen, Kai; Larssen, Thorjørn (2015) Effects of photodemethylation on the methylmercury budget of boreal Norwegian lakes Environmental Toxicology and Chemistry ISSN 0730-7268. Vol 34 No 6 s 1213 - 1223 doi: 10.1002/etc.2923
  12. Lindholm, Markus; de Wit, Heleen; Eriksen, Tor Erik; Braaten, Hans Fredrik Veiteberg (2014) The influence of littoral on mercury bioaccumulation in a humic lake Water, Air and Soil Pollution ISSN 0049-6979. Vol 225 No 10 doi: 10.1007/s11270-014-2141-4
  13. 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 (2014) Trends in surface water chemistry in acidified areas in Europe and North America from 1990 to 2008 Water, Air and Soil Pollution ISSN 0049-6979. Vol 225 No 3 s 1 - 14 doi: 10.1007/s11270-014-1880-6
  14. de Wit, Heleen; Granhus, Aksel; Lindholm, Markus; Kainz, Martin J.; Lin, Yan; Braaten, Hans Fredrik Veiteberg; Blaszczak, Joanna (2014) Forest harvest effects on mercury in streams and biota in Norwegian boreal catchments Forest Ecology and Management ISSN 0378-1127. Vol 324 s 52 - 63 doi: 10.1016/j.foreco.2014.03.044
  15. Braaten, Hans Fredrik Veiteberg; de Wit, Heleen; Fjeld, Eirik; Rognerud, Sigurd; Lydersen, Espen; Larssen, Thorjørn (2014) Environmental factors influencing mercury speciation in Subarctic and Boreal lakes Science of the Total Environment ISSN 0048-9697. Vol 476-477 No April s 336 - 345 doi: 10.1016/j.scitotenv.2014.01.030
  16. Braaten, Hans Fredrik Veiteberg; de Wit, Heleen; Harman, Christopher Peter; Hageström, Ulla; Larssen, Thorjørn (2014) Effects of sample preservation and storage on mercury speciation in natural stream water International Journal of Environmental Analytical Chemistry ISSN 0306-7319. Vol 94 No 4 s 381 - 384 doi: 10.1080/03067319.2013.823489
  17. de Wit, Heleen; Bryn, Anders; Hofgaard, Annika; Karstensen, Jonas; Kvalevåg, Maria Malene; Peters, Glen Philip (2013) Climate warming feedback from mountain birch forest expansion: Reduced albedo dominates carbon uptake Global Change Biology ISSN 1354-1013. Vol 20 No 7 s 2344 - 2355 doi: 10.1111/gcb.12483
  18. Martinsen, Vegard; Grund, Franz; Kjeve, Marit Ness; de Wit, Heleen; Austrheim, Gunnar; Mysterud, Atle; Mulder, Jan (2013) Differences in the quality of seepage water and runoff caused by plant community and grazing at an Alpine site in Hol, southern Norway Water, Air and Soil Pollution ISSN 0049-6979. Vol 224 doi: 10.1007/s11270-013-1649-3
  19. Holmberg, Maria; Vuorenmaa, Jussi; Posch, Maximilian; Forsius, Martin; Lundin, Lars; Kleemola, Sirpa; Augustaitis, Algirdas; Beudert, Burkhard; de Wit, Heleen; Dirnböck, Thomas; Evans, Christopher D.; Frey, Jane; Grandin, Ulf; Indriksone, Iveta; Krám, Pavel; Pompei, Enrico; Schulte-Bisping, Hubert; Srybny, Anatoly; Vána, Milan (2013) Relationship between critical load exceedances and empirical impact indicators at Integrated Monitoring sites across Europe Ecological Indicators ISSN 1470-160X. Vol 24 s 256 - 265 doi: 10.1016/j.ecolind.2012.06.013
  20. de Wit, Heleen; Kainz, Martin J.; Lindholm, Markus (2012) Methylmercury bioaccumulation in invertebrates of boreal streams in Norway: Effects of aqueous methylmercury and diet retention Environmental Pollution ISSN 0269-7491. Vol 164 s 235 - 241 doi: 10.1016/j.envpol.2012.01.041
NIVA begynte å registrere vitenskapelige artikler i CRIStin i 2010, rapporter fra 2014.

Rapporter

  1. de Wit, Heleen; Valinia, Salar; Steingruber, Sandra (2016) Proceedings of the 31st Task Force meeting of the ICP Waters Programme in Monte Verità, Switzerland, October 6-8, 2015. ICP Waters report 126/2016 , Norsk institutt for vannforskning. ISBN 978-82-577-6738-9. No 7003 (55 sider)
  2. Valinia, Salar; de Wit, Heleen (2016) Proceedings of the 32nd Task Force meeting of the ICP Waters Programme in Asker, Oslo, May 24-26, 2016 , Norsk institutt for vannforskning. ISBN 978-82-577-6825-6. No 7090 (51 sider)
  3. Velle, Gaute; Mahlum, Shad Kenneth; Monteith, Don T.; de Wit, Heleen; Arle, Jens; Fjellheim, Arne; Frolova, Marina; Fölster, Jens; Grudule, Natalja; Halvorsen, Godtfred A.; Hildrew, Alan; Hruska, Jakub; Indriksone, Iveta; Kamasova, Lenka; Kopáček, Jiří; Kram, Pavel; Orton, Stuart; Senoo, Takaaki; Shilland, Ewan M.; Stuchlík, Evžen; Telford, Richard J.; Ungermanova, Lenka; Wiklund, Magda-Lena; Wright, Richard F. (2016) Biodiversity of macro-invertebrates in acid-sensitive waters: trends and relations to water chemistry and climate , Norsk institutt for vannforskning. ISBN 978-82-577-6812-6. No 7077 (38 sider)
  4. Hansen, Georg Heinrich; Rasse, Daniel; de Wit, Heleen; Tømmervik, Hans; Bjerke, Jarle W.; Lund, Magnus; Parmentier, Frans-Jan (2015) Effects of climate variability on vegetation and carbon uptake in a North-Norwegian coastal wetland , NILU. ISBN 978-82-425-2818-6. No 40/2015 (22 sider)
  5. Fjellheim, Arne; Johannessen, Arne; Landås, Torunn Svanevik; de Wit, Heleen (2015) Biological intercalibration. Invertebrates 1915 - ICP Waters report 124/2015 , Norsk institutt for vannforskning. ISBN 978-82-577-6675-7. No 6940 (31 sider)
  6. de Wit, Heleen; Hettelingh, Jean-Paul; Harmens, Harry (2015) Trends in ecosystem and health responses to long-range transported atmospheric pollutants - ICP Waters report 125/2015 , Norsk institutt for vannforskning. ISBN 978-82-577-6681-8. No 6946 (92 sider)
  7. de Wit, Heleen; Wathne, Bente Margrethe (2015) Proceedings of the 30th Task Force meeting of the ICP Waters Programme in Grimstad, Norway 14th –16th October, 2014 , Norsk institutt for vannforskning. ISBN 978-82-577-6528-6. No 6793 (58 sider)
  8. Garmo, Øyvind Aaberg; de Wit, Heleen; Fjellheim, Arne (2015) Chemical and biological recovery in acid-sensitive waters: trends and prognosis (ICP Waters report 119/2015) , Norsk institutt for vannforskning. ISBN 978-82-577-6582-8. No 6847 (97 sider)
  9. Fjellheim, Arne; Johannessen, Arne; Landås, Torunn Svanevik; de Wit, Heleen (2014) Biological intercalibration: Invertebrates 1814 , Norsk institutt for vannforskning. ISBN 978-82-577-6496-8. No 6761 (24 sider)
  10. Fjellheim, Arne; Johannessen, Arne; Landås, Torunn Svanevik; de Wit, Heleen (2014) Biological intercalibration: Invertebrates 1713 , Norsk institutt for vannforsking. ISBN 978-82-577-6397-8. No 6662 (25 sider)
  11. de Wit, Heleen; Wathne, Bente Margrethe; Hruska, Jakub (2014) Proceedings of the 29th Task Force meeting of the ICP Waters Programme in Český Krumlov, Czech Republic 1st –3rd October, 2013 , Norsk institutt for vannforskning. ISBN 978-82-577-6378-7. No 6643 (63 sider)
  12. Velle, Gaute; Telford, Richard; Curtis, Chris; Erikson, Lars; Fjellheim, Arne; Frolova, Marina; Fölster, Jens; Grudule, Natalja; Halvorsen, Godtfred A.; Hildrew, Alan; Hoffman, Andreas; Indriksone, Iveta; Kamasova, Lenka; Kopáček, Jiří; Orton, Stuart; Kram, Pavel; Monteith, Don; Senoo, Takaaki; Shilland, Ewan; Stuchlik, Evzen; Wiklund, Magda lena; de Wit, Heleen; Skjelkvåle, Brit Lisa (2013) Biodiversity in freshwaters: temporal trends and response to water chemistry , ICP Waters Report, Norwegian Institute for Water Research. ISBN 978-82-577-6315-2. (66 sider)
  13. Framstad, Erik; de Wit, Heleen; Mäkipää, Raisa; Larjavaara, Markku; Vesterdal, Lars; Karltun, Erik (2013) Biodiversity, carbon storage and dynamics of old northern forests , Nordic Council of Ministers. ISBN 978-92-893-2510-3. No 507 (130 sider)
  14. Gundersen, Hege; Christie, Hartvig C; de Wit, Heleen; Norderhaug, Kjell Magnus; Bekkby, Trine; Walday, Mats (2011) Utredning om CO2-opptak i marine naturtyper , Norsk institutt for vannforskning (NIVA). ISBN 978-82-577-5805-9. No 6070 (25 sider)
  15. de Wit, Heleen; Raddum, Gunnar; Fjellheim, Arne; Erikson, Lars; Fott, Jan; Halvorsen, Godtfred Anker; Heegaard, Einar; Kohout, L.; Kifinger, B.; Schaumberg, Jochen; Maetze, A.; Zahn, H.; Skjelkvåle, Brit Lisa (2007) Trends in surface water chemistry and biota: The importance of confounding factors , Norsk institutt for vannforskning. (14 sider)
  16. Skjelkvåle, Brit lisa; Forsius, Martin; Wright, Richard; Dewit, Heleen; Raddum, Gunnar; Fjellheim, Arne; Sjøeng, Anne Merete (2006) Effects of confounding factors on recovery of invertebrates in acidified waters , Norsk institutt for vannforskning. ISBN 82-577-5041-7. (2 sider)
  17. de Wit, Heleen; Skjelkvåle, Brit Lisa (2006) Proceedings of the 21th meeting of the ICP Waters Programme Task Force in Tallinn, Estonia, October 17-19, 2005 , Norsk institutt for vannforskning. ISBN 82-577-4923-0. No 5204 (69 sider)
  18. de Wit, Heleen A.; Rafoss, Trond; Arnoldussen, Arnold; Skjelvåg, Arne Oddvar; Åssveen, Mauritz; Solbakken, Eivind; Klaveness, Mikal (2004) Grunnlag for Verdsetting av Innmark Bruk av plante-, klima- og jorddata ved verdsetting av innmark , NIJOS. ISBN 8274643194. No 04.apr (38 sider)
  19. Wit, Heleen A de; Kvindesland, Sheila (1999) Carbon stocks in Norwegian forest soils and effects of forest management on carbon storage , []. No 14suppl (52 sider)
NIVA begynte å registrere vitenskapelige artikler i CRIStin i 2010, rapporter fra 2014.

Andre

  1. Braaten, Hans Fredrik Veiteberg; Åkerblom, Staffan; Christensen, Guttorm N; Poste, Amanda; de Wit, Heleen; Jackson-Blake, Leah Amber (2017) Impacts of climate and lake browning on mercury concentrations in fish – an analysis of resampled perch populations in Scandinavia 13th international Conference on Mercury as a Global Pollutant 16.07.2017
  2. Braaten, Hans Fredrik Veiteberg; Lindholm, Markus; Halvorsen, Godtfred A.; de Wit, Heleen (2017) Re-writing history: Five decades of methylmercury concentrations in aquatic zoobenthos from lakes in the Norwegian boreal Ecozone 13th international Conference on Mercury as a Global Pollutant 16.07.2017
  3. Åkerblom, Staffan; Braaten, Hans Fredrik Veiteberg; de Wit, Heleen; Christensen, Guttorm (2017) A Fennoscandian platform of freshwater fish mercury data for the evaluation of effects of transboundary air pollution 13th international Conference on Mercury as a Global Pollutant 16.07.2017
  4. de Wit, Heleen; Braaten, Hans Fredrik Veiteberg; Vogt, Rolf David (2017) The role of DOM in catchment and lake mercury cycling in a boreal lake catchment 13th international Conference on Mercury as a Global Pollutant 16.07.2017
  5. Borchgrevink, Harald Bonaventura; de Wit, Heleen (2016) Vannet blir brunere i en våtere fremtid forskning.no 17.12.2016
  6. Couture, Raoul-Marie; de Wit, Heleen; Tominaga, Koji; Kiuru, Petri; Markelov, Igor (2015) Modelling the impact of increasing dissolved organic carbon load on seasonal anoxia in a boreal humic lake. Joint Assembly 2015 03.05.2015
  7. Borchgrevink, Harald Bonaventura; de Wit, Heleen (2014) Sur nedbør påvirker fortsatt norske elver forskning.no 06.05.2014
  8. Borchgrevink, Harald Bonaventura; de Wit, Heleen (2014) Acid rain still affects water quality sciencenordic.com 15.05.2014
  9. De Wit, Heleen; Pfaffhuber, Katrine Aspmo; Hole, Lars Robert; Berg, Torunn (2010) Inputs and outputs of Hg and MeHg in a catchment perspective Nordic Forestry Mercury Workshop 22.11.2010
  10. de Wit, Heleen A.; Astrup, Rasmuss; Engen-Skaugen, Torill; Hofgaard, Annika; Peters, Glen; Strand, Line Tau (2009) Terrestrial C sequestration potential in Norway under present and future climate (TerraC) Norklima - forskerkonferanse 2009 19.10.2009
  11. Lange, Holger; de Wit, Heleen A.; Thomas, Björn; Astrup, Rasmuss; Hylen, Gro; Strand, Line Tau (2009) Modelling forest- soil carbon at a national scale European Geosciences Union, General Assembly 2009 19.04.2009
  12. Furnes, Harald; De Wit, M; Robins, Brian (2009) Volcanic evolution of the upper onverwacht suite, Barberton mountain land, south Africa Geological Society of America annual meeting 18.10.2009
  13. Stuanes, Arne O.; Austnes, Kari; de Wit, Heleen A.; Haaland, Ståle; Hole, Lars R.; Kaste, Øyvind; Mulder, Jan; Riise, Gunnhild; Strand, Line Tau; Vestgarden, Live Semb; Wright, Richard F. (2007) The CLUE project: Effects of climate change on flux of N and C: air-land-freshwater-marine links Symposium Soil Processes 2007 25.02.2007
  14. Vogt, Rolf David; de Wit, Helene; Seip, Hans Martin; Riise, Gunnhild (2007) Regional Increases in Dissolved Natural Organic Matter linked to decrease in Acid Rain through lower Aluminium levels IHSS 11th Nordic-Baltic Symposium 10.06.2007
  15. Haugen, Thrond O.; Kristensen, Torstein; Wright, Richard F.; Rosseland, Bjørn Olav; Cosby, Jack; Bulger, Arthur; Skjelkvåle, Brit Lisa; Forsius, Martin; de Wit, Heleen A.; Raddum, Gunnar; Sjøeng, Anne Merete S. (2006) Fish under recovery: Interactions between ANC and density-dependent processes affect the recovery of fish populations after acidification i Joint Workshop on Confounding Factors in Recovery from Acid Depositions in Surface Waters, 9-10 October 2006, Bergen, Norway: Summary and abstracts, . Kapittel. s 22 - 23
  16. Rosseland, Bjørn Olav; Rognerud, Sigurd; Collen, Peter; Grimalt, J. O.; Vives, I.; Massabuau, J-C; Lackner, R; Hofer, R; Raddum, Gunnar; Fjellheim, Arne; Harriman, R; Pina, Benjamin; de Wit, Heleen A.; Skjelkvåle, Brit Lisa (2006) The effects of multiple stressors from metals and organic micropollutants on the brown trout in Lochnagar, Scotland i ICP-WATERS Report, .
  17. Rosseland, Bjørn Olav; Hesthagen, Trygve; Wright, Richard; Kroglund, Frode; Kristensen, Torstein; Saksgård, Randi; de Wit, Heleen A.; Skjelkvåle, Brit Lisa (2006) Lake Saudlandsvatn, Southern Norway, a lake under the process of recovery from acidification i ICP-WATERS Report, . s 33 - 37
  18. Strand, Line Tau; de Wit, Heleen A. (2005) Factors determining the distribution of carbon in Norwegian forest soils 2nd International Conference on Mecanismes of Organic Matter Stabilization and Destabilization in Soils 09.10.2005
  19. de Wit, Heleen A.; Mulder, Jan; Eldhuset, Toril (2005) Dissolved Al reduces Mg uptake in Norway spruce forest: Results from a long-term field manipulation experiment in Norway NFR_PROFO Sluttkonferanse 21.11.2005
  20. de Wit, Heleen A.; Mulder, Jan; Eldhuset, Toril (2005) Dissolved Al reduces Mg uptake in Norway spruce: results froma long-term field manipulation experiment Acid Rain 2005 12.06.2005
NIVA begynte å registrere vitenskapelige artikler i CRIStin i 2010, rapporter fra 2014.