title: Effect of climate change on flux of N and C: air-land-freshwater-marine links: synthesis.
abstract: Projected climate change might increase the deposition of nitrogen by about 10% to seminatural ecosystems in southern Norway. At Storgama, increased precipitation in the growing season increased the fluxes of total organic carbon (TOC) and total organic nitrogen (TON) in proportion to the water flux. In winter, soil temperatures near 0 degrees C, common under a snowpack, induced higher runoff of inorganic nitrogen (N) and lower runoff of TOC. By contrast, soil temperatures below freezing, caused by little snow accumulation (expected in a warmer world), reduced runoff of inorganic N, TON, and TOC. Long-term monitoring data showed that reduced snowpack can cause either decreased or increased N leaching, depending on interactions with N deposition, soil temperature regime, and winter discharge. Seasonal variation in TOC was mainly climatically controlled, whereas deposition of sulfate and nitrate (NO3) explained the long-term TOC increase. Upscaling to the river basin scale showed that the annual flux of NO3 will remain unchanged in response to climate change projections.
authors.affiliation: Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, Aas, Norway. arne.stuanes@umb.no
authors.forename: Arne O
authors.initials: AO
authors.lastname: Stuanes
authors.forename: Heleen A
authors.initials: HA
authors.lastname: de Wit
authors.forename: Lars R
authors.initials: LR
authors.lastname: Hole
authors.forename: Oyvind
authors.initials: O
authors.lastname: Kaste
authors.forename: Jan
authors.initials: J
authors.lastname: Mulder
authors.forename: Gunnhild
authors.initials: G
authors.lastname: Riise
authors.forename: Richard F
authors.initials: RF
authors.lastname: Wright
mesh_terms: D000388:Air; D002244:Carbon / Q000032:analysis*; D011232:Chemical Precipitation; D002980:Climate; D003247:Conservation of Natural Resources; D017753:Ecosystem; D005618:Fresh Water; D009566:Nitrates / Q000032:analysis; D009589:Nitrogen Oxides / Q000032:analysis*; D009664:Norway; D010087:Oxides / Q000032:analysis; D012621:Seasons; D012987:Soil; D013455:Sulfur
chemical_list: D009566:Nitrates; D009589:Nitrogen Oxides; D010087:Oxides; D012987:Soil; D013455:Sulfur; D002244:Carbon