Physics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3701401z&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 1, CiteID L01401
Physics
20
Global Change: Land/Atmosphere Interactions (1218, 1843, 3322), Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), Biogeosciences: Nitrogen Cycling, Biogeosciences: Carbon Cycling (4806)
Scientific paper
The effects of nitrogen (N) constraints on future terrestrial carbon (C) dynamics are investigated using the O-CN land surface model. The model's responses to elevated [CO2] and soil warming agree well with observations made in ecosystem manipulation studies. N dynamics reduce terrestrial C storage due to CO2 fertilization over the period 1860-2100 by ˜50% (342 Pg C) mainly in mid-high latitude ecosystems, compared to a simulation not accounting for N dynamics. Conversely, N dynamics reduce projected losses of land C due to increasing temperature by 16% (49 Pg C); however, this effect is prevalent only in mid-high latitude ecosystems. Despite synergistic interactions, the balance of these opposing effects is a significant reduction in future net land C storage. Terrestrial N dynamics thereby consistently increase atmospheric [CO2] in the year 2100 with a median value of 48 (41-55) ppmv, corresponding to an additional radiative forcing of 0.29 (0.28-0.34) W m-2.
Friedlingstein Pierre
Friend Andrew D.
Zaehle Sönke
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