Analysis of the NDVI Temporal Dynamics in Semi-arid Ecosystems: Brazilian Caatinga and African Western Sahel (Análise da Dinâmica Temporal do NDVI nos Ecossistemas Semi-áridos: Caatinga Brasileira e Sahel Ocidental Africano)
DOI:
https://doi.org/10.26848/rbgf.v4i2.232655Abstract
Os resultados indicaram que o efeito causado pelo evento El Niño, nos vários tipos de vegetação na região semi-árida do Nordeste do Brasil, durante as duas últimas décadas do século passado, apresentou diferentes padrões sazonais e interanuais dos tipos de vegetação no Sahel africano. A amplitude sazonal na variação do Índice de Vegetação Diferença Normalizada – NDVI, no Sahel Africano não foi alterada pelo efeito climático do El Niño, no entanto, na região semi-árida do Nordeste do Brasil, os tipos de vegetação foram afetados durante os eventos El Niño. Além disso, observou-se que o NDVI varia de acordo com as condições climáticas locais, apresentando uma lacuna temporal entre a ocorrência de precipitação e absorção de água disponível na vegetação. Esta informação é importante para mostrar condições de contorno para os modelos climáticos e também para a previsão numérica de tempo.
Palavras-chave: Vegetação, Aridez . Satelite
Análise da Dinâmica Temporal do NDVI nos Ecossistemas Semi-áridos: Caatinga Brasileira e Sahel Ocidental Africano
ABSTRACT
The results indicated that the effect caused by the El Niño event in the various types of vegetation in the semi-arid region of Northeast Brazil during the last two decades of the last century, presented a differing seasonal and interannual patterns from the vegetation types in the African Sahel. The seasonal amplitude of Normalized Difference Vegetation Index - NDVI variation in the African Sahel was not altered by the climatic effect of El Niño, however, in the semi-arid region of Northeast Brazil, the vegetation types were affected during the El Niño events. Furthermore, it was observed that the NDVI varies according to the local climatic conditions, presenting a temporal gap between the precipitation occurrence and water absorption available from the vegetation. This information is important to show contour conditions for climatic models and also for the weather numerical forecasting.
Keywords: Vegetation, drought, satellite.
Downloads
Published
How to Cite
Issue
Section
License
Authors who publish with Revista Brasileira de Geografia Física agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under the Creative Commons Attribution 4.0 International (CC BY 4.0) license that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted to make their work available online before or during the editorial process, on academic social networks, digital repositories, or preprint servers. After publication in Revista Brasileira de Geografia Física, authors are expected to update the preprint or postprint versions on the platforms where they were originally made available, providing a link to the final published version and any other relevant information, with proper recognition of authorship and the initial publication in this journal.
You are free to:
Share — copy and redistribute the material in any medium or format for any purpose, even commercially.
Adapt — remix, transform, and build upon the material for any purpose, even commercially.
The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:
Attribution — You must give appropriate credit , provide a link to the license, and indicate if changes were made . You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
