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Variability and trends of the rainy season in West Africa with a special focus on Guinea-Bissau

2025Journal article Open access
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dc.contributor.authorMendes, Orlando
dc.contributor.authorCorreia, Ezequiel
dc.contributor.authorFragoso, Marcelo
dc.date.accessioned2025-06-05T09:53:31Z
dc.date.available2025-06-05T09:53:31Z
dc.date.issued2025
dc.description.abstractThis study provides a novel assessment of trends in rainy season behavior (1981–2020) in West Africa by analyzing highresolution rainfall data from CHIRPS 2.0. Additionally, it presents the frst comprehensive study of rainy season characteristics in Guinea-Bissau, based on an analysis of the country's available observational data, over the same period. The agronomic method was used to determine the rainfall onset, while the soil water balance was used to calculate the cessation of the rainy season. The fndings indicate that the onset of the rainy season in West Africa progresses from south to north, beginning around 8°N in May and advancing to approximately 16°N by July and early August. The cessation of the rainy season follows an opposite, north-to-south trajectory, typically starting at 16°N in late September or early October and reaching 8°N by November and early December. This regional pattern is associated with the seasonal movements of the Intertropical Front. From 1981 to 2020, the onset, cessation, and duration of the rainy season in West Africa have exhibited signifcant variability. Although statistically signifcant trends are limited, these shifts still afect agricultural planning and crop planting schedules, underscoring the importance of continuous monitoring. The standard deviation in the onset of the rainy season ranges from 4 to 55 days, while the cessation shows less variability, spanning between 3 and 21 days. Meanwhile, the number of rainy days varies from 52 in the northern part of the study area to over 200 days in the southern regions. In Guinea-Bissau, rains typically start between 15–30 June each year, with notable diferences between the northern and southern parts of the country. The average cessation occurs between the frst and second weeks of November. Evolutionary trends suggest a slightly delayed onset of rainfall, with more stability in the cessation dates, leading to a slight reduction in the length of the rainy season.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMendes, O., Correia, E. & Fragoso, M. (2025). Variability and trends of the rainy season in West Africa with a special focus on Guinea-Bissau. Theoretical and Applied Climatology,156, 242. https://doi.org/10.1007/s00704-025-05471-6pt_PT
dc.identifier.doi10.1007/s00704-025-05471-6pt_PT
dc.identifier.issn0177-798X
dc.identifier.urihttp://hdl.handle.net/10400.5/101319
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringer Naturept_PT
dc.relationFOOD/2019/412–700, DeSIRA_GBpt_PT
dc.relationCentre of Geographical Studies
dc.relationCentre of Geographical Studies
dc.relation.publisherversionhttps://link.springer.com/article/10.1007/s00704-025-05471-6pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectRainy seasonpt_PT
dc.subjectWest Africapt_PT
dc.subjectGuinea‑Bissaupt_PT
dc.titleVariability and trends of the rainy season in West Africa with a special focus on Guinea-Bissaupt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre of Geographical Studies
oaire.awardTitleCentre of Geographical Studies
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00295%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00295%2F2020/PT
oaire.citation.issue5pt_PT
oaire.citation.startPage242pt_PT
oaire.citation.titleTheoretical and Applied Climatologypt_PT
oaire.citation.volume156pt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
person.familyNameCorreia
person.familyNameFragoso
person.givenNameEzequiel
person.givenNameMarcelo
person.identifier1154615
person.identifier189612
person.identifier.ciencia-id2D17-9E04-D652
person.identifier.ciencia-id701B-F3F7-5673
person.identifier.orcid0000-0002-4026-7020
person.identifier.orcid0000-0001-7272-3089
person.identifier.ridD-2959-2017
person.identifier.ridF-2991-2010
person.identifier.scopus-author-id7003418813
person.identifier.scopus-author-id23988281600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isProjectOfPublicationce3a92fe-3617-47ea-9260-5d510cafa789
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