La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Effect of climate change on fluxes of nitrogen from the Tovdal River basin, Norway, to adjoining marine areas
Auteurs :	Richard F. Wright, Auteur ; Oyvind Kaste, Auteur ; Heleen A. de Wit, Auteur ; Torulv Tjomsland, Auteur ; Mirjarn Bloemerts, Auteur ; Jarle Molvaer, Auteur ; John Rune Selvilk, Auteur
Type de document :	Article
Dans :	AMBIO (37(1) FEB 2008)
Article en page(s) :	64-72
Langues:	Anglais
Résumé :	The mass transport model TEOTIL was used to project nitrate (NO(3)) fluxes from the Tovdal River basin, southernmost Norway, given four scenarios of climate change. Forests, uplands, and open water currently account for 90% of the NO(3) flux. Climate scenarios for 2071-2100 suggest increased temperature by 2-4 degrees C and precipitation by 3-11%. Climate experiments and long-term monitoring were used to estimate future rates of nitrogen (N) leaching. More water will run through the terrestrial catchments during the winter but less will run in the spring. The annual NO(3) flux from the Tovdal River to the adjoining Topdalsfjord is projected to remain unchanged, but with more NO(3) delivered in the winter and less in the spring. Algal blooms in coastal waters can be expected to occur earlier in the year. Major sources of uncertainty are in the long-term fate of N stored in soil organic matter and the impacts of forest management.

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