Accuracy of satellite and reanalysis rainfall estimates over Africa: a multi-scale assessment of eight products for continental applications

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cg.contributor.affiliationInternational Water Management Instituteen_US
cg.contributor.affiliationUNESCO-IHE Institute for Water Educationen_US
cg.contributor.affiliationKoforidua Technical University, Ghanaen_US
cg.contributor.affiliationUniversity of Marylanden_US
cg.contributor.donorLeona M. and Harry B. Helmsley Charitable Trusten_US
cg.contributor.donorDigital Innovations for Water Secure Africa (DIWASA) Projecten_US
cg.coverage.regionAfricaen_US
cg.creator.identifierNaga Manohar Velpuri: 0000-0002-6370-1926en_US
cg.creator.identifierMansoor Leh: 0000-0001-8865-767Xen_US
cg.creator.identifierDr Akpoti Komlavi: 0000-0001-6435-5116en_US
cg.creator.identifierAfua Owusu: 0000-0001-6420-6663en_US
cg.identifier.doihttps://doi.org/10.1016/j.ejrh.2023.101514en_US
cg.identifier.iwmilibraryH052164en_US
cg.isijournalISI Journalen_US
cg.issn2214-5818en_US
cg.journalJournal of Hydrology: Regional Studiesen_US
cg.reviewStatusPeer Reviewen_US
cg.volume49en_US
dc.contributor.authorMekonnen, Kirubelen_US
dc.contributor.authorVelpuri, Naga Manoharen_US
dc.contributor.authorLeh, Mansooren_US
dc.contributor.authorAkpoti, Komlavien_US
dc.contributor.authorOwusu, Afuaen_US
dc.contributor.authorTinonetsana, Primroseen_US
dc.contributor.authorHamouda, T.en_US
dc.contributor.authorGhansah, B.en_US
dc.contributor.authorParanamana, Thilina Prabhathen_US
dc.contributor.authorMunzimi, Y.en_US
dc.date.accessioned2023-08-31T15:51:37Zen_US
dc.date.available2023-08-31T15:51:37Zen_US
dc.identifier.urihttps://hdl.handle.net/10568/131697en_US
dc.titleAccuracy of satellite and reanalysis rainfall estimates over Africa: a multi-scale assessment of eight products for continental applicationsen_US
dcterms.abstractStudy Region: Continental Africa Study Focus: This study evaluates the accuracy of eight gauge-corrected rainfall products across Africa through direct comparisons with in situ observations for the period 2001–2020. The effect of validation datasets on the performance of the rainfall products was also quantified in ten African countries. Four categorical and five continuous metrics were estimated at multiple spatial and temporal scales as part of the evaluation. New hydrological insights for the Region: Results indicate that the performance of the rainfall products varied in space and time. Evaluation at temporal scales revealed that, on average, most rainfall products showed poor results (KGE < 0.35) at the daily timescale. In contrast, RFE v2.0, ARC v2.0, and MSWEP v2.8 were reliable (KGE > 0.75) at the monthly and annual timescales. Among the rainfall products, the performance of TAMSATv3.1, PERSIANN-CDR, and ERA 5 was relatively poor in capturing in situ observations. Evaluation at various spatial scales revealed mixed results. The ARC v2.0 and CHIRPS v2.0 rainfall products were reliable in detecting no rains (< 1 mm/day) for all 19 spatial scales, indicating a high level of confidence for drought studies. IMERG-F v6B and RFE v2.0 were reliable in detecting heavy and high-intensity rainfall events for all spatial scales. Using the KGE performance metrics at the regional level, MSWEP v2.8 in the Northern Africa region, RFE v2.0 in the Western and Southern Africa regions, ARC v2.0 in Central Africa, and CHIRPS v2.0 in the Eastern Africa region showed better performances at monthly timescale. Moreover, the performance of the gauge-corrected rainfall datasets was reduced when compared with independent validation data (gauge data not used by rainfall products) than dependent validation data. This study provides several new insights into choosing a rainfall product for continental to regional applications and identifies the need for bias correction.en_US
dcterms.accessRightsOpen Accessen_US
dcterms.available2023-08-29en_US
dcterms.bibliographicCitationMekonnen, Kirubel; Velpuri, Naga Manohar; Leh, Mansoor; Akpoti, Komlavi; Owusu, Afua; Tinonetsana, Primrose; Hamouda, T.; Ghansah, B.; Paranamana, Thilina Prabhath; Munzimi, Y. 2023. Accuracy of satellite and reanalysis rainfall estimates over Africa: a multi-scale assessment of eight products for continental applications. Journal of Hydrology: Regional Studies, 49:101514. [doi: https://doi.org/10.1016/j.ejrh.2023.101514]en_US
dcterms.extent49:101514.en_US
dcterms.issued2023-10en_US
dcterms.languageenen_US
dcterms.licenseCC-BY-4.0en_US
dcterms.publisherElsevieren_US
dcterms.subjectrainfallen_US
dcterms.subjectestimationen_US
dcterms.subjectsatellitesen_US
dcterms.subjectdatasetsen_US
dcterms.subjectmodelsen_US
dcterms.subjectperformance assessmenten_US
dcterms.subjectevaluationen_US
dcterms.subjectclimatologyen_US
dcterms.subjectriver basinsen_US
dcterms.subjectclimatic zonesen_US
dcterms.subjectrain gaugesen_US
dcterms.subjectobservationen_US
dcterms.typeJournal Articleen_US

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