Spatial and temporal analysis of droughts in northeastern Brazil
Northeast Brazil (NEB) is a region often affected by strong droughts that cause severe impacts over agriculture, hydropower and water supply sectors. The most relevant features of severe droughts that occurred in the entire NEB during the 1901-2010 period (henceforth, dry spells) were evaluated. The...
| Main Authors: | , , |
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| Format: | Online |
| Language: | spa |
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Facultad de Ciencias Agropecuarias
2015
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| Online Access: | https://revistas.unc.edu.ar/index.php/agris/article/view/16552 |
| _version_ | 1811172544752910336 |
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| author | Paredes, F.J. Barbosa, H. Guevara, E. |
| author_facet | Paredes, F.J. Barbosa, H. Guevara, E. |
| author_sort | Paredes, F.J. |
| collection | Portal de Revistas |
| description | Northeast Brazil (NEB) is a region often affected by strong droughts that cause severe impacts over agriculture, hydropower and water supply sectors. The most relevant features of severe droughts that occurred in the entire NEB during the 1901-2010 period (henceforth, dry spells) were evaluated. The standardized precipitation index with a quarterly time scale was used as drought index (SPI3). The underlying patterns that configure the SPI-3 in the spatio-temporal domain were identified applying a principal component analysis followed by a cluster analysis. The dominant periodicities of the dry spells at monthly and annual scales were estimated applying a wavelet analysis. The most remarkable results were: i) the longest dry spells are linked to four dominant patterns which are alternated in time; ii) the monthly affected surface by dry spells has a periodicity of approximately 10 months, while the amount of annual dry spells show periods from 2 to 8, 10 and 30 yr respectively; iii) the dry spells do not show monotonous trends with relation to its duration, number of events per year and affected area; however, the longest episodes often occur during the main rainy season of the NEB. |
| format | Online |
| id | oai:ojs.revistas.unc.edu.ar:article-16552 |
| institution | Universidad Nacional de Cordoba |
| language | spa |
| publishDate | 2015 |
| publisher | Facultad de Ciencias Agropecuarias |
| record_format | ojs |
| spelling | oai:ojs.revistas.unc.edu.ar:article-165522020-02-13T20:50:38Z Spatial and temporal analysis of droughts in northeastern Brazil Análisis espacial y temporal de las sequías en el nordeste de Brasil Paredes, F.J. Barbosa, H. Guevara, E. drought Northeast Brazil climate variability. sequía nordeste de Brasil variabilidad climática. Northeast Brazil (NEB) is a region often affected by strong droughts that cause severe impacts over agriculture, hydropower and water supply sectors. The most relevant features of severe droughts that occurred in the entire NEB during the 1901-2010 period (henceforth, dry spells) were evaluated. The standardized precipitation index with a quarterly time scale was used as drought index (SPI3). The underlying patterns that configure the SPI-3 in the spatio-temporal domain were identified applying a principal component analysis followed by a cluster analysis. The dominant periodicities of the dry spells at monthly and annual scales were estimated applying a wavelet analysis. The most remarkable results were: i) the longest dry spells are linked to four dominant patterns which are alternated in time; ii) the monthly affected surface by dry spells has a periodicity of approximately 10 months, while the amount of annual dry spells show periods from 2 to 8, 10 and 30 yr respectively; iii) the dry spells do not show monotonous trends with relation to its duration, number of events per year and affected area; however, the longest episodes often occur during the main rainy season of the NEB. El nordeste de Brasil (NEB) es una región afectada por sequías que causan severos impactos sobre los sectores agrícola, hidroeléctrico y de abastecimiento hídrico. Se evaluaron las características más relevantes de las sequías severas acaecidas en el NEB entre 1901-2010 (en lo sucesivo, rachas secas). Se empleó el índice de precipitación estandarizada para medir la anomalía de la precipitación acumulada a escala trimestral (SPI-3). Los patrones subyacentes que configura el SPI-3 en el dominio espacio-temporal, se identificaron aplicando un análisis por componentes principales seguido de un análisis de conglomerados. La periodicidad de las rachas secas se evaluó aplicando un análisis de ondoleta. Entre los resultados, destacan: i) las rachas secas más extensas se ajustan a cuatro patrones espaciales que se intercalan en el tiempo; ii) el área afectada por rachas secas, a escala mensual, tiene un periodo aproximado de 10 meses, mientras que el número de eventos por año muestra periodos de entre 2 y 8, 10 y 30 años, respectivamente; iii) las rachas secas en cuanto a su duración, cantidad de eventos por año, recurrencia mensual y área afectada por estos eventos no muestran tendencias de largo plazo, aunque los episodios más extensos inciden con más frecuencia en la temporada húmeda. Facultad de Ciencias Agropecuarias 2015-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.unc.edu.ar/index.php/agris/article/view/16552 10.31047/1668.298x.v32.n1.16552 AgriScientia; Vol. 32 No. 1 (2015); 1-14 AgriScientia; Vol. 32 Núm. 1 (2015); 1-14 1668-298X 10.31047/1668.298x.v32.n1 spa https://revistas.unc.edu.ar/index.php/agris/article/view/16552/16361 |
| spellingShingle | drought Northeast Brazil climate variability. sequía nordeste de Brasil variabilidad climática. Paredes, F.J. Barbosa, H. Guevara, E. Spatial and temporal analysis of droughts in northeastern Brazil |
| title | Spatial and temporal analysis of droughts in northeastern Brazil |
| title_alt | Análisis espacial y temporal de las sequías en el nordeste de Brasil |
| title_full | Spatial and temporal analysis of droughts in northeastern Brazil |
| title_fullStr | Spatial and temporal analysis of droughts in northeastern Brazil |
| title_full_unstemmed | Spatial and temporal analysis of droughts in northeastern Brazil |
| title_short | Spatial and temporal analysis of droughts in northeastern Brazil |
| title_sort | spatial and temporal analysis of droughts in northeastern brazil |
| topic | drought Northeast Brazil climate variability. sequía nordeste de Brasil variabilidad climática. |
| topic_facet | drought Northeast Brazil climate variability. sequía nordeste de Brasil variabilidad climática. |
| url | https://revistas.unc.edu.ar/index.php/agris/article/view/16552 |
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