Representing nitrogen phosphorus and carbon interactions in the E3SM Land Model Development and global benchmarking Zhu Q W Riley J Tang N Collier F Hoffman X Yang G Bisht Representing Nitrogen Phosphorus and Carbon Interactions in the E3SM Land Model Development and Global B ID: 768402
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Representing nitrogen, phosphorus, and carbon interactions in the E3SM Land Model: Development and global benchmarking Zhu Q., W. Riley, J. Tang, N. Collier, F. Hoffman, X. Yang, G. Bisht. “Representing Nitrogen, Phosphorus, and Carbon Interactions in the E3SM Land Model: Development and Global Benchmarking” Journal of Advances in Modeling Earth Systems (2019) https://doi.org/10.1029/2018MS001571 Research Details Significance and Impact We developed a new carbon-nitrogen-phosphorus land model (ELMv1-ECA) integrated in the E3SM earth system model.We benchmarked the simulated present-day carbon cycle using the International Land Model Benchmarking package (ILAMB).We documented model performance and identified necessary future improvements. Scientific Achievement Modeling C/N/P dynamics is an important step towards better predicting and understanding future climate. In this study, we present a new land model that mechanistically simulates terrestrial ecosystem C/N/P processes and evaluate the model against multiple large-scale datasets. We demonstrate the novelty of the model and show that the model significantly outperforms its predecessor versions We introduce a new approach to model multi-nutrient (nitrogen (N), phosphorus (P)) limitations in the Energy Exascale Earth System Model (E3SM) Land Model version 1 (ELMv1-ECA), grounded on (1) advances in representing multiple-consumer, multiple-nutrient competition; (2) a generic dynamic allocation scheme based on water, N, P, and light availability; (3) flexible plant CNP stoichiometry; (4) prognostic treatment of N and P constraints on several carbon cycle processes; and (5) global datasets of plant physiological traits. Compared with predecessor versions, ELMv1-ECA better predicts global-scale gross primary productivity, ecosystem respiration, leaf area index, vegetation biomass, soil carbon stocks, evapotranspiration, N2O emissions, and NO3- leaching. Figure 1. Illustration of Energy Exascale Earth System Model (E3SM) Land Model version 1‐Equilibrium Chemistry Approximation (ELMv1‐ECA) major features: (1) prognostic leaf N and P content directly coupled to leaf level CO2 sequestration; (2) multiple ‐consumer competition network for soil nutrients including NH4+, NO3‐, and POx; and (3) dynamic carbon allocation for leaf, stem, and root