One third of African rivers fail to meet the ’good ambient water quality’ nutrient targets

19970 7 107366 2 325306 document 107366 1-s2.0-S1470160X2401001X-main.pdf application/pdf 7f512dd1665411c8339049310ff4eedd MD5 8299961 2024-09-04 07:40:18 https://pure.iiasa.ac.at/id/eprint/19970/1/1-s2.0-S1470160X2401001X-main.pdf 19970 1 1 application/pdf text en public cc_by_4

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published 107368 2 325320 document 107368 lightbox.jpg image/png d838e519b0ec18cd3b299117b08194c4 MD5 52063 2024-09-04 07:50:24 https://pure.iiasa.ac.at/id/eprint/19970/2/lightbox.jpg 19970 2 2 image/png other Thumbnails conversion from text to thumbnail_lightbox en public

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/107366 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/107366 http://eprints.org/relation/isIndexCodesVersionOf https://pure.iiasa.ac.at/id/document/107366 archive 353 disk0/00/01/99/70 2024-09-04 07:42:24 2025-03-12 05:01:21 2024-09-04 07:42:24 article show Nkwasa A. 9900 0000-0002-8685-8854 James Chawanda C. Theresa Nakkazi M. Tang T. Eisenreich S.J. Warner S. van Griensven A. One third of African rivers fail to meet the ’good ambient water quality’ nutrient targets pub BNR WAT Sustainable Development Goal (SDG), Nitrogen pollution, Phosphorus pollution, Africa, SWAT+ The ambition of Sustainable Development Goal (SDG) target 6.3 is to improve global water quality by 2030. SDG indicator 6.3.2 monitors progress towards this target by assessing water bodies against ‘good’ ambient water quality criteria, with nutrients (nitrogen and phosphorus) as part of the key metrics. However, large data gaps present a fundamental challenge, especially for Africa on how to assess the progress being made with respect to both the current and desired future situations. Here, a continental water quality model for Africa is presented to simulate river sediment load, Total Nitrogen (TN) and Total Phosphorus (TP) loads and concentrations. Furthermore, critical areas and hotspots of TN and TP pollution are mapped for the period 2017 – 2019, in relation to the United Nations Environment Programme (UNEP) target thresholds used for the assessment of SDG indicator 6.3.2. Utilizing the UNEP’s criteria, which designates a water body as having “good ambient water quality” if 80% or more of its monitored values meet their targets, it is estimated that 44 % and 15 % of African rivers fail to meet the set water quality thresholds for simulated TP and TN, respectively. When synthesizing data for both TP and TN, 34 % of the rivers do not qualify as having “good ambient water quality”. Geographically, the most pronounced nutrient pollution hotspots were in North Africa, Niger River Delta, Nile River basin, Congo River basin and specific zones in Southern Africa. These areas correlate with regions characterized by high inputs of fertilizers, manure and wastewater discharge. 2024-09 published Elsevier doi:10.1016/j.ecolind.2024.112544 3740 public Ecological Indicators 166 e112544 TRUE 1470-160X no info:eu-repo/semantics/article