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| Titel |
Coupling global models for hydrology and nutrient loading to simulate nitrogen and phosphorus retention in surface water – description of IMAGE–GNM and analysis of performance |
| VerfasserIn |
A. H. W. Beusen, L. P. H. Van Beek, A. F. Bouwman, J. M. Mogollón, J. J. Middelburg |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 12 ; Nr. 8, no. 12 (2015-12-21), S.4045-4067 |
| Datensatznummer |
250116710
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| Publikation (Nr.) |
 copernicus.org/gmd-8-4045-2015.pdf |
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| Zusammenfassung |
| The Integrated Model to Assess the Global
Environment–Global Nutrient Model (IMAGE–GNM) is a global
distributed, spatially explicit model
using hydrology as the basis for describing nitrogen (N) and phosphorus (P)
delivery to surface water, transport and in-stream retention in rivers,
lakes, wetlands and reservoirs. It is part of the integrated assessment model
IMAGE, which studies the interaction between society and the environment over
prolonged time periods. In the IMAGE–GNM model, grid cells receive water
with dissolved and suspended N and P from upstream grid cells; inside grid
cells, N and P are delivered to water bodies via diffuse sources (surface
runoff, shallow and deep groundwater, riparian zones; litterfall in
floodplains; atmospheric deposition) and point sources (wastewater); N and P
retention in a water body is calculated on the basis of the residence time of
the water and nutrient uptake velocity; subsequently, water and nutrients are
transported to downstream grid cells. Differences between model results and
observed concentrations for a range of global rivers are acceptable given the
global scale of the uncalibrated model. Sensitivity analysis with data for
the year 2000 showed that runoff is a major factor for N and P delivery,
retention and river export. For both N and P, uptake velocity and all factors
used to compute the subgrid in-stream retention are important for total
in-stream retention and river export. Soil N budgets, wastewater and all
factors determining litterfall in floodplains are important for N delivery to
surface water. For P the factors that determine the P content of the soil
(soil P content and bulk density) are important factors for delivery and
river export. |
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