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
cg.contributor.affiliationUNESCO-IHE Institute for Water Educationen
cg.contributor.affiliationKoforidua Technical University, Ghanaen
cg.contributor.affiliationUniversity of Marylanden
cg.contributor.donorLeona M. and Harry B. Helmsley Charitable Trusten
cg.contributor.donorDigital Innovations for Water Secure Africa (DIWASA) Projecten
cg.coverage.regionAfrica
cg.creator.identifierNaga Manohar Velpuri: 0000-0002-6370-1926en
cg.creator.identifierMansoor Leh: 0000-0001-8865-767Xen
cg.creator.identifierDr Akpoti Komlavi: 0000-0001-6435-5116en
cg.creator.identifierAfua Owusu: 0000-0001-6420-6663en
cg.identifier.doihttps://doi.org/10.1016/j.ejrh.2023.101514en
cg.identifier.iwmilibraryH052164en
cg.isijournalISI Journalen
cg.issn2214-5818en
cg.journalJournal of Hydrology: Regional Studiesen
cg.reviewStatusPeer Reviewen
cg.volume49en
dc.contributor.authorMekonnen, Kirubelen
dc.contributor.authorVelpuri, Naga Manoharen
dc.contributor.authorLeh, Mansooren
dc.contributor.authorAkpoti, Komlavien
dc.contributor.authorOwusu, Afuaen
dc.contributor.authorTinonetsana, Primroseen
dc.contributor.authorHamouda, T.en
dc.contributor.authorGhansah, B.en
dc.contributor.authorParanamana, Thilina Prabhathen
dc.contributor.authorMunzimi, Y.en
dc.date.accessioned2023-08-31T15:51:37Zen
dc.date.available2023-08-31T15:51:37Zen
dc.identifier.urihttps://hdl.handle.net/10568/131697
dc.titleAccuracy of satellite and reanalysis rainfall estimates over Africa: a multi-scale assessment of eight products for continental applicationsen
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
dcterms.accessRightsOpen Access
dcterms.available2023-08-29en
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
dcterms.extent49:101514.en
dcterms.issued2023-10en
dcterms.languageen
dcterms.licenseCC-BY-4.0
dcterms.publisherElsevieren
dcterms.subjectrainfallen
dcterms.subjectestimationen
dcterms.subjectsatellitesen
dcterms.subjectdatasetsen
dcterms.subjectmodelsen
dcterms.subjectperformance assessmenten
dcterms.subjectevaluationen
dcterms.subjectclimatologyen
dcterms.subjectriver basinsen
dcterms.subjectclimatic zonesen
dcterms.subjectrain gaugesen
dcterms.subjectobservationen
dcterms.typeJournal Article

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