Patterns of spatial and temporal variability in streamflow records in south central Chile in the period 1952-2003
Artículo de publicación ISI In this work we study the time series of annual and seasonal streamflow for 44 rivers in southern Chile, spanning the ecoregion between 34°S and 45°S for the 1952–2003 period. We analyze spatial variability using a clustering process to define regional streamflow averages...
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ftunivchile:oai:repositorio.uchile.cl:2250/126144 2023-05-15T13:41:32+02:00 Patterns of spatial and temporal variability in streamflow records in south central Chile in the period 1952-2003 Rubio Álvarez, Eduardo Mc Phee Torres, James 2010 application/pdf https://doi.org/10.1029/2009WR007982 https://repositorio.uchile.cl/handle/2250/126144 en_US eng WATER RESOURCES RESEARCH, 46, 2010 doi:10.1029/2009WR007982 https://repositorio.uchile.cl/handle/2250/126144 Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Artículo de revista 2010 ftunivchile https://doi.org/10.1029/2009WR007982 2023-01-29T00:53:54Z Artículo de publicación ISI In this work we study the time series of annual and seasonal streamflow for 44 rivers in southern Chile, spanning the ecoregion between 34°S and 45°S for the 1952–2003 period. We analyze spatial variability using a clustering process to define regional streamflow averages. We find two main regions, divided approximately by parallel 37.5°S. The analysis includes application of the multitaper (MTM) and maximum entropy (MEM) methods to find periodicities or interannual and decadal cycles. Singular spectral analysis (SSA) is applied in order to augment the signal‐to‐noise ratio. Significant correlation with climatic indexes was found at different spatial and temporal scales, with El Niño–Southern Oscillation (ENSO) influence being stronger at the northern subregion, and notably the Antarctic Oscillation (AAO) and the Pacific Decadal Oscillation (PDO) showing strong correlation with summer flows in the southern subregion. Also, we found significant decreasing trends affecting a region between 37.5°S and 40°S. These are coherent with decreasing trends observed in precipitation in the area, and also with a decreasing trend observed in the Southern Oscillation Index (SOI). These findings provide, for the first time, a comprehensive view of the streamflow variability in a sensitive ecoregion in South America. We expect that these results will inform decision making in a context of increasing water demands for diverse uses as well as contribute to the general understanding of climatic patterns of variability in the Pacific Rim. Article in Journal/Newspaper Antarc* Antarctic Universidad de Chile: Repositorio académico Antarctic Isi ENVELOPE(-38.550,-38.550,65.617,65.617) Pacific Soi ENVELOPE(30.704,30.704,66.481,66.481) The Antarctic Water Resources Research 46 5 |
institution |
Open Polar |
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Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
description |
Artículo de publicación ISI In this work we study the time series of annual and seasonal streamflow for 44 rivers in southern Chile, spanning the ecoregion between 34°S and 45°S for the 1952–2003 period. We analyze spatial variability using a clustering process to define regional streamflow averages. We find two main regions, divided approximately by parallel 37.5°S. The analysis includes application of the multitaper (MTM) and maximum entropy (MEM) methods to find periodicities or interannual and decadal cycles. Singular spectral analysis (SSA) is applied in order to augment the signal‐to‐noise ratio. Significant correlation with climatic indexes was found at different spatial and temporal scales, with El Niño–Southern Oscillation (ENSO) influence being stronger at the northern subregion, and notably the Antarctic Oscillation (AAO) and the Pacific Decadal Oscillation (PDO) showing strong correlation with summer flows in the southern subregion. Also, we found significant decreasing trends affecting a region between 37.5°S and 40°S. These are coherent with decreasing trends observed in precipitation in the area, and also with a decreasing trend observed in the Southern Oscillation Index (SOI). These findings provide, for the first time, a comprehensive view of the streamflow variability in a sensitive ecoregion in South America. We expect that these results will inform decision making in a context of increasing water demands for diverse uses as well as contribute to the general understanding of climatic patterns of variability in the Pacific Rim. |
format |
Article in Journal/Newspaper |
author |
Rubio Álvarez, Eduardo Mc Phee Torres, James |
spellingShingle |
Rubio Álvarez, Eduardo Mc Phee Torres, James Patterns of spatial and temporal variability in streamflow records in south central Chile in the period 1952-2003 |
author_facet |
Rubio Álvarez, Eduardo Mc Phee Torres, James |
author_sort |
Rubio Álvarez, Eduardo |
title |
Patterns of spatial and temporal variability in streamflow records in south central Chile in the period 1952-2003 |
title_short |
Patterns of spatial and temporal variability in streamflow records in south central Chile in the period 1952-2003 |
title_full |
Patterns of spatial and temporal variability in streamflow records in south central Chile in the period 1952-2003 |
title_fullStr |
Patterns of spatial and temporal variability in streamflow records in south central Chile in the period 1952-2003 |
title_full_unstemmed |
Patterns of spatial and temporal variability in streamflow records in south central Chile in the period 1952-2003 |
title_sort |
patterns of spatial and temporal variability in streamflow records in south central chile in the period 1952-2003 |
publishDate |
2010 |
url |
https://doi.org/10.1029/2009WR007982 https://repositorio.uchile.cl/handle/2250/126144 |
long_lat |
ENVELOPE(-38.550,-38.550,65.617,65.617) ENVELOPE(30.704,30.704,66.481,66.481) |
geographic |
Antarctic Isi Pacific Soi The Antarctic |
geographic_facet |
Antarctic Isi Pacific Soi The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
WATER RESOURCES RESEARCH, 46, 2010 doi:10.1029/2009WR007982 https://repositorio.uchile.cl/handle/2250/126144 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1029/2009WR007982 |
container_title |
Water Resources Research |
container_volume |
46 |
container_issue |
5 |
_version_ |
1766151733713567744 |