Global Nutrient Export from WaterSheds 2 (NEWS 2): Model development and implementation

Emilio Mayorga; Sybil P. Seitzinger; John A. Harrison; Egon Dumont; Arthur H.W. Beusen; A. F. Bouwman; Balazs M. Fekete; Carolien Kroeze; Gerard Van Drecht

doi:10.1016/j.envsoft.2010.01.007

Global Nutrient Export from WaterSheds 2 (NEWS 2): Model development and implementation

Emilio Mayorga^*, Sybil P. Seitzinger, John A. Harrison, Egon Dumont, Arthur H.W. Beusen, A. F. Bouwman, Balazs M. Fekete, Carolien Kroeze, Gerard Van Drecht

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Global NEWS is a global, spatially explicit, multi-element and multi-form model of nutrient exports by rivers. Here we present NEWS 2, the new version of Global NEWS developed as part of a Millennium Ecosystem Assessment scenario implementation from hindcast (1970) to contemporary (2000) and future scenario trajectories (2030 & 2050). We provide a detailed model description and present an overview of enhancements to input datasets, emphasizing an integrated view of nutrient form sub-models and contrasts with previous NEWS models (NEWS 1). An important difference with NEWS 1 is our unified model framework (multi-element, multi-form) that facilitates detailed watershed comparisons regionally and by element or form. NEWS 2 performs approximately as well as NEWS 1 while incorporating previously uncharacterized factors. Although contemporary global river export estimates for dissolved inorganic nitrogen (DIN) and particulates show notable reductions, they are within the range of previous studies; global exports for other nutrient forms are comparable to NEWS 1. NEWS 2 can be used as an effective tool to examine the impact of polices to reduce coastal eutrophication at regional to global scales. Continued enhancements will focus on the incorporation of other forms and sub-basin spatial variability in drivers and retention processes.

Original language	English
Pages (from-to)	837-853
Number of pages	17
Journal	Environmental Modelling and Software
Volume	25
Issue number	7
DOIs	https://doi.org/10.1016/j.envsoft.2010.01.007
Publication status	Published - 1 Jul 2010

Funding

We are grateful to UNESCO-IOC for supporting this work and to Charles Vörösmarty, Dominik Wisser, Rosalynn Lee, Gilles Billen, Josette Garnier and the rest of the Global NEWS working group for useful discussion and feedback. We thank Cory Cleveland and Chris Neill for discussions on tropical nitrogen cycling. NASA supported the work of E. M., S. P. S., J. A. H. and B. M. F. NOAA additionally supported the work of S. P. S. The work of A. H. W. B., A. F. B. and G. V. was part of the project Integrated Terrestrial Modeling of the Netherlands Environmental Assessment Agency (PBL). Appendix

Keywords

Basin models
Coastal inputs
Global NEWS
Global river exports
Millennium ecosystem assessment scenarios
Nutrients

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.envsoft.2010.01.007

Cite this

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title = "Global Nutrient Export from WaterSheds 2 (NEWS 2): Model development and implementation",

abstract = "Global NEWS is a global, spatially explicit, multi-element and multi-form model of nutrient exports by rivers. Here we present NEWS 2, the new version of Global NEWS developed as part of a Millennium Ecosystem Assessment scenario implementation from hindcast (1970) to contemporary (2000) and future scenario trajectories (2030 & 2050). We provide a detailed model description and present an overview of enhancements to input datasets, emphasizing an integrated view of nutrient form sub-models and contrasts with previous NEWS models (NEWS 1). An important difference with NEWS 1 is our unified model framework (multi-element, multi-form) that facilitates detailed watershed comparisons regionally and by element or form. NEWS 2 performs approximately as well as NEWS 1 while incorporating previously uncharacterized factors. Although contemporary global river export estimates for dissolved inorganic nitrogen (DIN) and particulates show notable reductions, they are within the range of previous studies; global exports for other nutrient forms are comparable to NEWS 1. NEWS 2 can be used as an effective tool to examine the impact of polices to reduce coastal eutrophication at regional to global scales. Continued enhancements will focus on the incorporation of other forms and sub-basin spatial variability in drivers and retention processes.",

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Global Nutrient Export from WaterSheds 2 (NEWS 2): Model development and implementation

Abstract

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Keywords

UN SDGs

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