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Carbon and nitrogen cycle dynamics in the O-CN land surface model: 2. Role of the nitrogen cycle in the historical terrestrial carbon balance

Abstract : Global-scale results of the new O-CN terrestrial biosphere model coupling the carbon (C) and nitrogen (N) cycles show that the model produces realistic estimates of presentday C and N stocks and fluxes, despite some regional biases. N availability strongly affects high-latitude foliage area and foliage N, limiting vegetation productivity and present-day high-latitude net C uptake. Anthropogenic N deposition is predicted to have increased net primary productivity due to increases in foliage area and foliage N, contributing 0.2-0.5 Pg C yr À1 to the 1990s global net C uptake. While O-CN's modeled global 1990s terrestrial net C uptake (2.4 Pg C yr À1) is similar to the estimate not accounting for anthropogenic N inputs and N dynamics (2.6 Pg C yr À1), its latitudinal distribution and the sensitivity of the terrestrial C balance to its driving factors are substantially altered by N dynamics, with important implications for future trajectories of the global carbon cycle.
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https://hal.archives-ouvertes.fr/hal-03201208
Contributor : Florence Aptel <>
Submitted on : Sunday, April 18, 2021 - 10:51:19 AM
Last modification on : Tuesday, April 20, 2021 - 3:30:58 AM

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S. Zaehle, A. Friend, P. Friedlingstein, F. Dentener, P. Peylin, et al.. Carbon and nitrogen cycle dynamics in the O-CN land surface model: 2. Role of the nitrogen cycle in the historical terrestrial carbon balance. Global Biogeochemical Cycles, American Geophysical Union, 2010, 24 (1), pp.n/a-n/a. ⟨10.1029/2009GB003522⟩. ⟨hal-03201208⟩

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