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...
Guardado en:
| Publicado: |
2014
|
|---|---|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_22251154_v2_n4_p264_Rivera http://hdl.handle.net/20.500.12110/paper_22251154_v2_n4_p264_Rivera |
| Aporte de: |
| id |
paper:paper_22251154_v2_n4_p264_Rivera |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_22251154_v2_n4_p264_Rivera2023-06-08T16:35:24Z Trends and spatial patterns of drought affected area in southern South America 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. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_22251154_v2_n4_p264_Rivera 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 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. |
| 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 |
| publishDate |
2014 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_22251154_v2_n4_p264_Rivera http://hdl.handle.net/20.500.12110/paper_22251154_v2_n4_p264_Rivera |
| _version_ |
1768543010439561216 |