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Abstract:

Based on 56 rainfall stations, which cover the period 1961-2008, we analyzed the presence of trends in the drought-affected area over southern South America (SSA) at different time scales. In order to define drought conditions, we used the standardized precipitation index, which was calculated on time scales of 1, 3, 6, 9 and 12 months. The trends were estimated following both a linear and a non-linear approach. The non-linear approach was based on the residual of the empirical mode decomposition, a recently proposed methodology, which is robust in presence of non-stationary data. This assessment indicates the existence of reversals in the trends of the drought affected, area around the 1990s, from decreasing trends during the first period to increasing trends during the recent period. This is indicative of the existence of a low-frequency variability that modulates regional precipitation patterns at different temporal scales, and warns about possible future consequences in the social and economic sectors if trends towards an increase in the drought affected area continue. © 2014 by the authors; licensee MDPI, Basel, Switzerland.

Registro:

Documento: Artículo
Título:Trends and spatial patterns of drought affected area in southern South America
Autor:Rivera, J.A.; Penalba, O.C.
Filiación:Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, CCT-Mendoza/CONICET, Av. Ruiz Leal s/n, Parque General San Martín, Mendoza, 5500, Argentina
Unidad Mixta Internacional-Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (UMI-IFAECI), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Pabellón 2, 2° Piso-Ciudad Universitaria, Buenos Aires, C1428EGA, Argentina
Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Pabellón 2, 2° Piso-Ciudad Universitaria, Buenos Aires, C1428EGA, Argentina
Palabras clave:Drought; Southern South America; Spatial patterns; Standardized precipitation index; Trends
Año:2014
Volumen:2
Número:4
Página de inicio:264
Página de fin:278
DOI: http://dx.doi.org/10.3390/cli2040264
Título revista:Climate
Título revista abreviado:Clim.
ISSN:22251154
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_22251154_v2_n4_p264_Rivera

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Citas:

---------- APA ----------
Rivera, J.A. & Penalba, O.C. (2014) . Trends and spatial patterns of drought affected area in southern South America. Climate, 2(4), 264-278.
http://dx.doi.org/10.3390/cli2040264
---------- CHICAGO ----------
Rivera, J.A., Penalba, O.C. "Trends and spatial patterns of drought affected area in southern South America" . Climate 2, no. 4 (2014) : 264-278.
http://dx.doi.org/10.3390/cli2040264
---------- MLA ----------
Rivera, J.A., Penalba, O.C. "Trends and spatial patterns of drought affected area in southern South America" . Climate, vol. 2, no. 4, 2014, pp. 264-278.
http://dx.doi.org/10.3390/cli2040264
---------- VANCOUVER ----------
Rivera, J.A., Penalba, O.C. Trends and spatial patterns of drought affected area in southern South America. Clim. 2014;2(4):264-278.
http://dx.doi.org/10.3390/cli2040264