Articles | Volume 8, issue 3
Development and technical paper
24 Mar 2015
Development and technical paper |  | 24 Mar 2015

Accelerating the spin-up of the coupled carbon and nitrogen cycle model in CLM4

Y. Fang, C. Liu, and L. R. Leung

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Short summary
1. A gradient projection method was used to reduce the computation time of carbon-nitrogen spin-up processes in CLM4. 2. Point-scale simulations showed that the cyclic stability of total carbon for some cases differs from that of the periodic atmospheric forcing, and some cases even showed instability. 3. The instability issue is resolved after the hydrology scheme in CLM4 is replaced with a flow model for variably saturated porous media.