Preprints
https://doi.org/10.5194/bg-2022-130
https://doi.org/10.5194/bg-2022-130
 
17 Jun 2022
17 Jun 2022
Status: this preprint is currently under review for the journal BG.

Global evaluation of ELMv1-CNP and the role of the phosphorus cycle in the historical terrestrial carbon balance

Xiaojuan Yang1, Peter Thornton1, Daniel Ricciuto1, Yilong Wang2,3, and Forrest Hoffman4 Xiaojuan Yang et al.
  • 1Environmental Sciences Division, Oak Ridge National Lab, Oak Ridge, TN 37831, USA
  • 2Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
  • 3Laboratoire des Sciences du Climat et de l’Environnement, CEA-CNRS-UVSQ- Université Paris Saclay, 91191, Gif-sur-Yvette CEDEX, France
  • 4Computational Sciences & Engineering Division, Oak Ridge National Lab, Oak Ridge, TN 37831, USA

Abstract. The importance of carbon (C)-nutrient interactions to the prediction of future C uptake has long been recognized. The Energy Exascale Earth System Model (E3SM) land model (ELM) version 1 is one of the few land surface models that include both N and P cycling and limitation (ELMv1-CNP). Here we provide a global scale evaluation of ELMv1-CNP using International Land Model Benchmarking (ILAMB) system. We show that ELMv1-CNP produces realistic estimates of present-day carbon pools and fluxes. Compared to simulations with optimal P availability, simulations with ELMv1-CNP produces better performance, particularly for simulated biomass, leaf area index (LAI), and global net C balance. We also show ELMv1-CNP simulated N and P cycling are in good agreement with data-driven estimates. We compared ELMv1-CNP simulated response to CO2 enrichment with meta-analysis of observations from similar manipulation experiments. We show that ELMv1-CNP is able to capture the field observed responses for photosynthesis, growth, and LAI. We investigated the role of P limitation in the historical balance and show that global C sources and sinks are significantly affected by P limitation, as the historical CO2 fertilization effect was reduced by 20 % and C emission due to land use and land cover change was 11 % lower when P limitation was considered. Our simulations suggest that introduction of P cycle dynamics and C-N-P coupling will likely have substantial consequences for projections of future C uptake.

Xiaojuan Yang et al.

Status: open (until 29 Jul 2022)

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Xiaojuan Yang et al.

Xiaojuan Yang et al.

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Short summary
We evaluated the performance of a land surface model (ELMv1-CNP) that includes both nitrogen (N) and phosphorus (P) limitation on carbon cycle processes. We show that ELMv1-CNP produces realistic estimates of present-day carbon pools and fluxes. We show that global C sources and sinks are significantly affected by P limitation. Our study suggests that introduction of P limitation in land surface models likely have substantial consequences for projections of future carbon uptake.
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