Trends and spatial patterns of drought affected area in southern South America

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 ti...

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Detalles Bibliográficos
Autores principales: Rivera, J.A., Penalba, O.C.
Formato: JOUR
Materias:
Drought
Southern South America
Spatial patterns
Standardized precipitation index
Trends
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_22251154_v2_n4_p264_Rivera
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_22251154_v2_n4_p264_Rivera
record_format dspace
spelling todo:paper_22251154_v2_n4_p264_Rivera2023-10-03T16:40:43Z Trends and spatial patterns of drought affected area in southern South America Rivera, J.A. Penalba, O.C. Drought Southern South America Spatial patterns Standardized precipitation index Trends 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_22251154_v2_n4_p264_Rivera
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Drought
Southern South America
Spatial patterns
Standardized precipitation index
Trends
spellingShingle Drought
Southern South America
Spatial patterns
Standardized precipitation index
Trends
Rivera, J.A.
Penalba, O.C.
Trends and spatial patterns of drought affected area in southern South America
topic_facet Drought
Southern South America
Spatial patterns
Standardized precipitation index
Trends
description 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.
format JOUR
author Rivera, J.A.
Penalba, O.C.
author_facet Rivera, J.A.
Penalba, O.C.
author_sort Rivera, J.A.
title Trends and spatial patterns of drought affected area in southern South America
title_short Trends and spatial patterns of drought affected area in southern South America
title_full Trends and spatial patterns of drought affected area in southern South America
title_fullStr Trends and spatial patterns of drought affected area in southern South America
title_full_unstemmed Trends and spatial patterns of drought affected area in southern South America
title_sort trends and spatial patterns of drought affected area in southern south america
url http://hdl.handle.net/20.500.12110/paper_22251154_v2_n4_p264_Rivera
work_keys_str_mv AT riveraja trendsandspatialpatternsofdroughtaffectedareainsouthernsouthamerica
AT penalbaoc trendsandspatialpatternsofdroughtaffectedareainsouthernsouthamerica
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