Preprints
https://doi.org/10.5194/gmd-2021-403
https://doi.org/10.5194/gmd-2021-403
Submitted as: model description paper
07 Dec 2021
Submitted as: model description paper | 07 Dec 2021
Status: this preprint is currently under review for the journal GMD.

Representation of phosphorus cycle in Joint UK Land Environment Simulator (vn5.5_JULES-CNP)

Mahdi Nakhavali1, Lina M. Mercado1,2, Iain P. Hartley1, Stephen Sitch1, Fernanda V. Cunha3, Raffaello di Ponzio3, Laynara F. Lugli3, Carlos A. Quesada3, Kelly M. Andersen1,4,5, Sarah E. Chadburn6, Andy J. Wiltshire1,7, Douglas B. Clark2, Gyovanni Ribeiro3, Lara Siebert3, Anna C. M. Moraes3, Jéssica Schmeisk Rosa3, Rafael Assis3, and José L. Camargo3 Mahdi Nakhavali et al.
  • 1University of Exeter, College of Life and Environmental Sciences, Exeter, EX4 4QE, United Kingdom
  • 2UK Centre for Ecology and Hydrology, Wallingford, OX10 8BB, United Kingdom
  • 3Coordination of Environmental Dynamics, National Institute of Amazonian Research, Manaus, AM 69060-062, Brazil
  • 4University of Edinburgh, School of Geosciences, Edinburgh, EH8 9AB, UK
  • 5Nanyang Technological University, Asian School of the Environment, Singapore, 639798, Singapore
  • 6College of Engineering, Mathematics, and Physical Sciences, University of Exeter, Exeter, EX4 4QE, United Kingdom
  • 7Met Office Hadley Centre, Exeter, Devon, EX1 3PB, United Kingdom

Abstract. Most Land Surface Models (LSMs), the land components of Earth system models (ESMs), include representation of N limitation on ecosystem productivity. However only few of these models have incorporated phosphorus (P) cycling. In tropical ecosystems, this is likely to be particularly important as N tends to be abundant but the availability of rock-derived elements, such as P, can be very low. Thus, without a representation of P cycling, tropical forest response in areas such as Amazonia to rising atmospheric CO2 conditions remains highly uncertain. In this study, we introduced P dynamics and its interactions with the N and carbon (C) cycles into the Joint UK Land Environment Simulator (JULES). The new model (JULES-CNP) includes the representation of P stocks in vegetation and soil pools, as well as key processes controlling fluxes between these pools. We evaluate JULES-CNP at the Amazon nutrient fertilization experiment (AFEX), a low fertility site, representative of about 60 % of Amazon soils. We apply the model under ambient CO2 and elevated CO2. The model is able to reproduce the observed plant and soil P pools and fluxes under ambient CO2. We estimate P to limit net primary productivity (NPP) by 24 % under current CO2 and by 46 % under elevated CO2. Under elevated CO2, biomass in simulations accounting for CNP increase by 10 % relative to at contemporary CO2, although it is 5 % lower compared with CN and C-only simulations. Our results highlight the potential for high P limitation and therefore lower CO2 fertilization capacity in the Amazon forest with low fertility soils.

Mahdi Nakhavali et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on gmd-2021-403', Astrid Kerkweg, 21 Dec 2021
    • AC1: 'Reply on CEC1', Mahdi (Andre) Nakhavali, 11 Mar 2022
  • RC1: 'Comment on gmd-2021-403', Mingkai Jiang, 30 Dec 2021
    • AC2: 'Reply on RC1', Mahdi (Andre) Nakhavali, 11 Mar 2022
  • RC2: 'Comment on gmd-2021-403', Anonymous Referee #2, 07 Jan 2022
    • AC3: 'Reply on RC2', Mahdi (Andre) Nakhavali, 11 Mar 2022
  • RC3: 'Comment on gmd-2021-403', Anonymous Referee #3, 10 Jan 2022
    • AC4: 'Reply on RC3', Mahdi (Andre) Nakhavali, 11 Mar 2022

Mahdi Nakhavali et al.

Mahdi Nakhavali et al.

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Short summary
In tropical ecosystems, the availability of rock-derived elements, such as P, can be very low. Thus, without a representation of P cycling, tropical forest response in areas such as Amazonia to rising atmospheric CO2 conditions remains highly uncertain. We introduced P dynamics and its interactions with the N and P cycles into the JULES model. Our results highlight the potential for high P limitation and therefore lower CO2 fertilization capacity in the Amazon forest with low fertility soils.