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Streamflow variations across the Andes (18°–55°S) during the instrumental era

The rivers originating in the southern Andes (18°–55°S) support numerous ecosystems and a large number of human populations and socio-economic activities in the adjacent lowlands of Chile, Argentina and Bolivia. Here we show that ca. 75% of the total variance in the streamflow records from this exte...

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Autores principales: Masiokas, M. H., Cara, L., Villalba, R., Pitte, P., Luckman, B. H., Toum, E., Christie, D. A., Le Quesne, C., Mauget, S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6884640/
https://www.ncbi.nlm.nih.gov/pubmed/31784550
http://dx.doi.org/10.1038/s41598-019-53981-x
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author Masiokas, M. H.
Cara, L.
Villalba, R.
Pitte, P.
Luckman, B. H.
Toum, E.
Christie, D. A.
Le Quesne, C.
Mauget, S.
author_facet Masiokas, M. H.
Cara, L.
Villalba, R.
Pitte, P.
Luckman, B. H.
Toum, E.
Christie, D. A.
Le Quesne, C.
Mauget, S.
author_sort Masiokas, M. H.
collection PubMed
description The rivers originating in the southern Andes (18°–55°S) support numerous ecosystems and a large number of human populations and socio-economic activities in the adjacent lowlands of Chile, Argentina and Bolivia. Here we show that ca. 75% of the total variance in the streamflow records from this extensive region can be explained by only eight spatially coherent patterns of variability. Five (three) of these Andean patterns exhibit extreme dry (wet) conditions in recent years, with strong interannual variations in northern Chile; long-term drying trends between 31° and 41°S; a transitional pattern in the central Patagonian Andes; and increasing trends in northwestern Argentina and southern Bolivia, the Fueguian Andes, and the eastern portion of the South Patagonian Icefield. Multivariate regression analyses show that large-scale indices of ENSO variability can predict 20% to 45% of annual runoff variability between 28° and 46°S. The influence of Antarctic and North Pacific indices becomes more relevant south of 43°S and in northwestern Argentina and southern Bolivia, respectively, but their overall skill as predictors of Andean streamflows is weak. The analyses provide relevant new information to improve understanding of the spatial coherence, the main temporal features, and the ocean-atmospheric forcings of surface runoff across the southern Andes.
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spelling pubmed-68846402019-12-06 Streamflow variations across the Andes (18°–55°S) during the instrumental era Masiokas, M. H. Cara, L. Villalba, R. Pitte, P. Luckman, B. H. Toum, E. Christie, D. A. Le Quesne, C. Mauget, S. Sci Rep Article The rivers originating in the southern Andes (18°–55°S) support numerous ecosystems and a large number of human populations and socio-economic activities in the adjacent lowlands of Chile, Argentina and Bolivia. Here we show that ca. 75% of the total variance in the streamflow records from this extensive region can be explained by only eight spatially coherent patterns of variability. Five (three) of these Andean patterns exhibit extreme dry (wet) conditions in recent years, with strong interannual variations in northern Chile; long-term drying trends between 31° and 41°S; a transitional pattern in the central Patagonian Andes; and increasing trends in northwestern Argentina and southern Bolivia, the Fueguian Andes, and the eastern portion of the South Patagonian Icefield. Multivariate regression analyses show that large-scale indices of ENSO variability can predict 20% to 45% of annual runoff variability between 28° and 46°S. The influence of Antarctic and North Pacific indices becomes more relevant south of 43°S and in northwestern Argentina and southern Bolivia, respectively, but their overall skill as predictors of Andean streamflows is weak. The analyses provide relevant new information to improve understanding of the spatial coherence, the main temporal features, and the ocean-atmospheric forcings of surface runoff across the southern Andes. Nature Publishing Group UK 2019-11-29 /pmc/articles/PMC6884640/ /pubmed/31784550 http://dx.doi.org/10.1038/s41598-019-53981-x Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Masiokas, M. H.
Cara, L.
Villalba, R.
Pitte, P.
Luckman, B. H.
Toum, E.
Christie, D. A.
Le Quesne, C.
Mauget, S.
Streamflow variations across the Andes (18°–55°S) during the instrumental era
title Streamflow variations across the Andes (18°–55°S) during the instrumental era
title_full Streamflow variations across the Andes (18°–55°S) during the instrumental era
title_fullStr Streamflow variations across the Andes (18°–55°S) during the instrumental era
title_full_unstemmed Streamflow variations across the Andes (18°–55°S) during the instrumental era
title_short Streamflow variations across the Andes (18°–55°S) during the instrumental era
title_sort streamflow variations across the andes (18°–55°s) during the instrumental era
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6884640/
https://www.ncbi.nlm.nih.gov/pubmed/31784550
http://dx.doi.org/10.1038/s41598-019-53981-x
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