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Multicentury tree ring reconstruction of annual streamflow for the Maule River watershed in south central Chile
Author(s) -
Urrutia Rocío B.,
Lara Antonio,
Villalba Ricardo,
Christie Duncan A.,
Le Quesne Carlos,
Cuq Augusto
Publication year - 2011
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2010wr009562
Subject(s) - streamflow , ecoregion , watershed , climatology , precipitation , environmental science , atlantic multidecadal oscillation , pacific decadal oscillation , dendrochronology , drainage basin , north atlantic oscillation , climate change , hydrology (agriculture) , el niño southern oscillation , geography , geology , oceanography , meteorology , ecology , cartography , archaeology , geotechnical engineering , machine learning , computer science , biology
Because of the reported decreasing trends in precipitation in south central Chile and the high priority of the Valdivian rain forest ecoregion conservation, it is essential to understand long‐term changes in water availability in this area. Thus, this study presents a 410 year annual streamflow reconstruction for the Maule River watershed located in a Mediterranean‐type climate in the northern part of the ecoregion (35°S–36°30′S). The annual streamflow reconstruction used Austrocedrus chilensis tree ring chronologies, and the adjusted R 2 was 0.42. The reconstruction was characterized by interannual, interdecadal, and multidecadal oscillation modes, some of which might be explained by solar and lunar cycles and by ocean‐atmospheric forcings. Temporal correlations between the reconstruction and climatic indices, such as the El Niño–Southern Oscillation and the Antarctic Oscillation, demonstrate that water availability is influenced by tropical and high‐latitude forcings in this area. Extreme low and high streamflows are particularly related to ocean‐atmospheric conditions in the tropical Pacific. The Maule River watershed streamflow reconstruction reveals a higher proportion of streamflows below the mean in the last century compared to the previous three centuries.