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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 12
Hydrol. Earth Syst. Sci., 21, 6307–6327, 2017
https://doi.org/10.5194/hess-21-6307-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Hydrol. Earth Syst. Sci., 21, 6307–6327, 2017
https://doi.org/10.5194/hess-21-6307-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 13 Dec 2017

Research article | 13 Dec 2017

The 2010–2015 megadrought in central Chile: impacts on regional hydroclimate and vegetation

René D. Garreaud1,2, Camila Alvarez-Garreton3,2, Jonathan Barichivich3,2, Juan Pablo Boisier1,2, Duncan Christie3,2, Mauricio Galleguillos4,2, Carlos LeQuesne3, James McPhee5,6, and Mauricio Zambrano-Bigiarini7,2 René D. Garreaud et al.
  • 1Department of Geophysics, Universidad de Chile, Santiago, Chile
  • 2Center for Climate and Resilience Research (CR2), Santiago, Chile
  • 3Laboratorio de Dendrocronología y Cambio Global, Instituto de Conservación Biodiversidad y Territorio, Universidad Austral de Chile, Valdivia, Chile
  • 4Faculty of Agronomic Sciences, Universidad de Chile, Santiago, Chile
  • 5Department of Civil Engineering, Universidad de Chile, Santiago, Chile
  • 6Advanced Mining Technology Center, Universidad de Chile, Santiago, Chile
  • 7Department of Civil Engineering, Faculty of Engineering and Sciences, Universidad de La Frontera, Temuco, Chile

Abstract. Since 2010 an uninterrupted sequence of dry years, with annual rainfall deficits ranging from 25 to 45 %, has prevailed in central Chile (western South America, 30–38° S). Although intense 1- or 2-year droughts are recurrent in this Mediterranean-like region, the ongoing event stands out because of its longevity and large extent. The extraordinary character of the so-called central Chile megadrought (MD) was established against century long historical records and a millennial tree-ring reconstruction of regional precipitation. The largest MD-averaged rainfall relative anomalies occurred in the northern, semi-arid sector of central Chile, but the event was unprecedented to the south of 35° S. ENSO-neutral conditions have prevailed since 2011 (except for the strong El Niño in 2015), contrasting with La Niña conditions that often accompanied past droughts. The precipitation deficit diminished the Andean snowpack and resulted in amplified declines (up to 90 %) of river flow, reservoir volumes and groundwater levels along central Chile and westernmost Argentina. In some semi-arid basins we found a decrease in the runoff-to-rainfall coefficient. A substantial decrease in vegetation productivity occurred in the shrubland-dominated, northern sector, but a mix of greening and browning patches occurred farther south, where irrigated croplands and exotic forest plantations dominate. The ongoing warming in central Chile, making the MD one of the warmest 6-year periods on record, may have also contributed to such complex vegetation changes by increasing potential evapotranspiration. We also report some of the measures taken by the central government to relieve the MD effects and the public perception of this event. The understanding of the nature and biophysical impacts of the MD helps as a foundation for preparedness efforts to confront a dry, warm future regional climate scenario.

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This work synthesizes an interdisciplinary research on the megadrought (MD) that has afflicted central Chile since 2010. Although 1- or 2-year droughts are not infrequent in this Mediterranean-like region, the ongoing dry period stands out because of its longevity and large extent, leading to unseen hydrological effects and vegetation impacts. Understanding the nature and biophysical impacts of the MD contributes to confronting a dry, warm future regional climate scenario in subtropical regions.
This work synthesizes an interdisciplinary research on the megadrought (MD) that has afflicted...
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