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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2016-690
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
13 Jan 2017
Review status
This discussion paper has been under review for the journal Hydrology and Earth System Sciences (HESS). The manuscript was not accepted for further review after discussion.
Climate change impacts on hydroclimatic regimes and extremes over Andean basins in central Chile
Deniz Bozkurt1, Maisa Rojas1,2, Juan Pablo Boisier1, and Jonás Valdivieso3 1Center for Climate and Resilience Research, University of Chile, Santiago, Chile
2Department of Geophysics, University of Chile, Santiago, Chile
3Department of Civil Engineering, University of Chile, Santiago, Chile
Abstract. This study examines the projections of hydroclimatic regimes and extremes over Andean basins in central Chile (∼ 30–40 S). We have used daily precipitation and temperature data based on observations to drive and validate the VIC macro-scale hydrological model in the region of interest at a 0.25 × 0.25 degree resolution. Historical (1960–2005) and projected, following the RCP8.5 scenario (2006–2099), daily precipitation and temperatures from 26 CMIP5 climate models are bias corrected and used to drive the VIC model to obtain regional hydroclimate projections. Following the robust drying and warming shown by CMIP5 models in this region, the VIC model simulations indicate decreases in annual runoff of about 40 % by the end of the century, larger that the projected precipitation decreases (up to 30 %). Center timing of runoff shifts to earlier dates, 3–5 weeks by the end of the century. The Andes snowpack is projected to be less than half of the reference period by mid-century. The projected hydroclimatic regime is also expected to increase the severity and frequency of extreme events. The probability of having extended droughts, such as the recently experienced mega-drought (2010–2015), increases to up to 5 events/100 years. On the other hand, probability density function of annual maximum daily runoff indicates an increase in the frequency of flood events. The estimated return periods of annual maximum runoff events depict more drastic changes and increase in the flood risk as longer return periods are considered (e.g. 25-yr and 50-yr).

Citation: Bozkurt, D., Rojas, M., Boisier, J. P., and Valdivieso, J.: Climate change impacts on hydroclimatic regimes and extremes over Andean basins in central Chile, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2016-690, 2017.
Deniz Bozkurt et al.
Deniz Bozkurt et al.

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In this study, historical (1960–2005) and projected, following the RCP8.5 scenario (2006–2099), daily precipitation and temperatures from 26 CMIP5 climate models are bias corrected and used to drive the VIC model in order to obtain regional hydroclimate projections. Our study highlights that the robust drying and warming conditions are expected to increase the severity and frequency of extreme events such as recently experienced mega-drought (2010–2015) in this densely populated region in Chile.
In this study, historical (1960–2005) and projected, following the RCP8.5 scenario (2006–2099),...
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