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Change trends in drought susceptibility: a case study using SPI in northeast Portugal

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dc.contributor.authorRoyer, Ana Caroline
dc.contributor.authorFigueiredo, Tomás de
dc.contributor.authorFonseca, Felícia
dc.contributor.authorSchütz, Fabiana Costa Araújo
dc.contributor.authorHernández, Zulimar
dc.date.accessioned2021-10-25T14:43:14Z
dc.date.available2021-10-25T14:43:14Z
dc.date.issued2020
dc.description.abstractClear changes in global climate are being reported and future climate scenarios keep alerting to relevant changes in mean air temperature and in rainfall distribution patterns. Increase in weather conditions variability in recent years prospects higher frequency and severity of extreme events, namely an extension of drought periods. Much of Trás-os-Montes mountain region, northeast Portugal, are drylands enduring soil degradation processes, therefore facing medium to high susceptibility to desertification and drought. This study aimed at analyzing temporal change trends in the extension of drought periods in in northeast (NE) Portugal. The Standardized Precipitation Index (SPI ) was computed with monthly precipitation data series (made available by SNIRH - Sistema Nacional de Informação de Recursos Hídricos) of weather stations that cover the main climatic domains of the region (humid to semiarid) and are considered as reference due to their long term records (>70 years): Vinhais, Alfândega da Fé, Macedo de Cavaleiros, Malhadas, Carviçais and Montezinho. SPI response time scales have been set to 1, 3 and 6 months, and were obtained for three climatological normal: 1931-1960, 1951-1980 and 1971-2000. The analysis focused on the overlapped periods (decades of 1951-1960 and 1971-1980, with 120 months each), where SPI class frequencies issued from each one of the two overlapping normal were compared. As SPI response time scale increases (1 to 6 months) and a more recent climatological normal is considered (1931-1960 to 1971-2000), the frequencies of dry and wet months in the overlapped periods increased ate the expenses of the normal months’ frequencies. Frequencies of months with severe and extreme drought during the overlapped periods increased as well, more visibly for the SPI 3 months time scale and for stations located in semi-arid zones. The general change trend observed in the study confirms a progressive increase in drought extension and severity in a region already facing desertification threat as NE Portugal.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationRoyer, Ana Caroline; Figueiredo, Tomás de; Fonseca, Felícia; Schütz, Fabiana; Hernández, Zulimar (2020). Change trends in drought susceptibility: a case study using SPI in northeast Portugal. In V Congresso Internacional de Riscos. ISBN 978-989-54942-0-0pt_PT
dc.identifier.isbn978-989-54942-0-0
dc.identifier.urihttp://hdl.handle.net/10198/24093
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisher©RISCOS – Associação Portuguesa de Riscos, Prevenção e Segurançapt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectSPIpt_PT
dc.subjectClimate changept_PT
dc.subjectAriditypt_PT
dc.subjectDesertificationpt_PT
dc.titleChange trends in drought susceptibility: a case study using SPI in northeast Portugalpt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceUniversidade de Coimbrapt_PT
oaire.citation.titleV Congresso Internacional de Riscos “Contributos da ciência para a redução do risco. Agir hoje para proteger o amanhã“pt_PT
person.familyNameRoyer
person.familyNameFigueiredo
person.familyNameFonseca
person.givenNameAna Caroline
person.givenNameTomás d'Aquino
person.givenNameFelícia
person.identifier1297327
person.identifier.ciencia-id721A-9374-4C35
person.identifier.ciencia-id961D-607D-51CC
person.identifier.orcid0000-0002-0746-185X
person.identifier.orcid0000-0001-7690-8996
person.identifier.orcid0000-0001-7727-071X
person.identifier.scopus-author-id54790554500
person.identifier.scopus-author-id36970960500
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
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relation.isAuthorOfPublicationdb897e48-ecf7-4ce1-ba27-369260337510
relation.isAuthorOfPublication4f6f8be1-73c1-45bb-b159-ce3f8ff96c84
relation.isAuthorOfPublication.latestForDiscovery4f6f8be1-73c1-45bb-b159-ce3f8ff96c84

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