Drought characterization in the Northeast Brazil: a multiscale watershed analysis and remote sensing monitoring

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES

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Autor principal: Mutti, Pedro Rodrigues
Outros Autores: Bezerra, Bergson Guedes
Formato: doctoralThesis
Idioma:pt_BR
Publicado em: Universidade Federal do Rio Grande do Norte
Assuntos:
Semiarid
Water balance
Climate extremes
Data series gap-filling
Desertification
NDVI
SPEI
Endereço do item:https://repositorio.ufrn.br/handle/123456789/31308
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spelling ri-123456789-313082021-01-24T10:49:29Z Drought characterization in the Northeast Brazil: a multiscale watershed analysis and remote sensing monitoring Mutti, Pedro Rodrigues Bezerra, Bergson Guedes http://lattes.cnpq.br/5475390537931966 http://lattes.cnpq.br/1901216516407999 Bigot, Sylvain Arvor, Damien http://lattes.cnpq.br/2940915374250704 Galvíncio, Josiclêda Domiciano http://lattes.cnpq.br/7217736964361440 Andrade, Lara de Melo Barbosa http://lattes.cnpq.br/0327817672623352 Dubreuil, Vincent http://lattes.cnpq.br/4820223919671343 Semiarid Water balance Climate extremes Data series gap-filling Desertification NDVI SPEI Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES Drought is a recurrent phenomenon in the Northeast Brazil (NEB) region, especially in its semiarid inlands, which are characterized by a remarkable climate variability, the expansion of desertification areas and persistent water-use conflicts. Furthermore, future climate change projections indicate that drought events will become more frequent and intense, exerting more pressure over the already vulnerable region. Although several drought studies have been carried out at the NEB, some important methodological aspects inherent to data quality and control, specificities of the used techniques, and spatial scale still need to be further discussed. Therefore, the objective of this thesis is to characterize different aspects of drought in the NEB considering different spatial scales, meteorological data characteristics, and remote sensing monitoring alternatives. This characterization was carried out in the São Francisco watershed (SFW), which presents a remarkable climate diversity, in the Piranhas-Açu watershed (PAW), which is mostly located in the semiarid NEB, and in desertification hotspots. In the first study, we thoroughly validated Climate Research Unit Time Series (CRU TS) gridded precipitation and potential evapotranspiration data over the SFW. CRU TS data presents overall good correlation with observed data. Then, we compared the applicability of the evaporation deficit and the Standardized Precipitation-Evapotranspiration Index as drought indices in the SFW. Results show that periods of water shortage are becoming more frequent and more intense in the coastal and middle zones of the basin, indicating an expansion of aridity. In the second study, we used gap-filled observed rainfall time series in order to propose a comprehensive climatological analysis in the PAW. A rainfall anomaly index was used to identify drought events, which are mostly associated with El Niño events and the anomalous warming of the Tropical North Atlantic Ocean. Finally, in the third study, different stochastic models were tested in order to forecast remotely sensed Normalized Difference Vegetation Index data (MOD13A2 product) over six desertification hotspots in the NEB. Results show that the tested models satisfactorily forecast short-term dry and degraded vegetation states. The results of this thesis contribute to the current general knowledge associated with drought assessment over semiarid regions, and the specific results of each study can be further explored by management agencies or local entities in the development of specific strategies to face and adapt to drought in the NEB. 2021-01-21T17:11:35Z 2021-01-21T17:11:35Z 2020-12-10 doctoralThesis MUTTI, Pedro Rodrigues. Drought characterization in the Northeast Brazil: a multiscale watershed analysis and remote sensing monitoring. 2020. 161f. Tese (Doutorado em Ciências Climáticas) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2020. https://repositorio.ufrn.br/handle/123456789/31308 pt_BR Acesso Aberto application/pdf Universidade Federal do Rio Grande do Norte Brasil UFRN PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIAS CLIMÁTICAS
institution Repositório Institucional
collection RI - UFRN
language pt_BR
topic Semiarid
Water balance
Climate extremes
Data series gap-filling
Desertification
NDVI
SPEI
spellingShingle Semiarid
Water balance
Climate extremes
Data series gap-filling
Desertification
NDVI
SPEI
Mutti, Pedro Rodrigues
Drought characterization in the Northeast Brazil: a multiscale watershed analysis and remote sensing monitoring
description Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
author2 Bezerra, Bergson Guedes
author_facet Bezerra, Bergson Guedes
Mutti, Pedro Rodrigues
format doctoralThesis
author Mutti, Pedro Rodrigues
author_sort Mutti, Pedro Rodrigues
title Drought characterization in the Northeast Brazil: a multiscale watershed analysis and remote sensing monitoring
title_short Drought characterization in the Northeast Brazil: a multiscale watershed analysis and remote sensing monitoring
title_full Drought characterization in the Northeast Brazil: a multiscale watershed analysis and remote sensing monitoring
title_fullStr Drought characterization in the Northeast Brazil: a multiscale watershed analysis and remote sensing monitoring
title_full_unstemmed Drought characterization in the Northeast Brazil: a multiscale watershed analysis and remote sensing monitoring
title_sort drought characterization in the northeast brazil: a multiscale watershed analysis and remote sensing monitoring
publisher Universidade Federal do Rio Grande do Norte
publishDate 2021
url https://repositorio.ufrn.br/handle/123456789/31308
work_keys_str_mv AT muttipedrorodrigues droughtcharacterizationinthenortheastbrazilamultiscalewatershedanalysisandremotesensingmonitoring
_version_ 1773960944448176128

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