期刊
WATER RESOURCES RESEARCH
卷 47, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2010WR009562
关键词
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资金
- Fondecyt [1050298, 1090479]
- Inter American Institute for Global Change Research [CRNII-2047]
- FORECOS Scientific Nucleus [P04-065-F]
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 degrees S-36 degrees 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 Nino-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.
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