ORCHIDEE-CN-P_v1.2_r5986

This version of ORCHIDEE has been used in publication "Global evaluation of nutrient enabled version land surface model ORCHIDEE-CNP v1.2 (r5986)" by Sun et al submitted to GMD (gmd-2020-93). Reference will be added as soon as the paper is published.

Abstract

Nitrogen (N) and phosphorus (P) constraints on carbon (C) and energy exchanges between terrestrial biosphere and atmosphere are a major source of uncertainty regarding the drivers of the land C sink. In this study, we evaluated the performance of the global version of the land surface model ORCHIDEE-CNP (v1.2) which explicitly simulates N and P cycles on land, based on a compilation of data from remote-sensing, ground-based measurement networks and ecological databases. The sensitivity of gross primary productivity (GPP) to increasing CO 2 and water availability in ORCHIDEE-CNP is more realistic in the nutrient- enabled model version. However, this model version cannot capture the current land C sink in the North Hemisphere (NH), suggesting that either (1) other processes (besides CO 2 fertilization) currently not well resolved in global models such as biomass turnover, land management, and soil decomposition might play an important role, or (2) that ORCHIDEE-CNP underestimates the ability of ecosystems to circumpass nutrient constraints on biomass built up under elevated atmospheric CO 2 concentrations . Components of the N and P budgets at biome level are in good agreement with independent estimates, but large-scale patterns in ecosystem stoichiometry cannot be reproduced. The analysis of plant use efficiencies of light, water, C, N and P and seasonal dynamics reveal issues with respect to canopy processes, plant respiration and growth allocation in ORCHIDEE-CNP. We propose ways how to address the model biases by refining the canopy light absorption processes, root and leaf phenology processes and dynamics of biomass turnover and by better representing soil processes related to decomposition, stabilization of soil organic matter and inorganic P transformation.

Code access

• See the version on the webinterface here : ​https://forge.ipsl.jussieu.fr/orchidee/browser/branches/publications/ORCHIDEE_gmd-2018-261
• Extract it on a terminal as follow, type anonymous as password:

  svn co --username anonymous svn://forge.ipsl.jussieu.fr/orchidee/branches/publications/ORCHIDEE_CN-P_v1.2_r5986 ORCHIDEE
  

Metadata

DOI	missing
Creator	Daniel S. Goll |
Affiliation	University Augsburg
Title	ORCHIDEE-CN-P_v1.2_r5986
Publisher	Institut Pierre Simon Laplace (IPSL)
PublicationYear	2020
ResourceType	Software
Rights	This software is distributed under the CeCILL license
rightsURI	​http://www.cecill.info/
Subject	Land surface model, model evaluation
DataManager	Karim Ramage (IPSL)
DataCurator	Josefine Ghattas (IPSL)
ContactPerson	Daniel Goll (UA)
FundingReference	funded by the “IMBALANCE-P” project of the European Research Council (ERC-2013-SyG-610028)