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Assessment of climate change impacts on climate variables using probabilistic ensemble modeling and trend analysis

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Abstract

Water resources in snow-dependent regions have undergone significant changes due to climate change. Snow measurements in these regions have revealed alarming declines in snowfall over the past few years. The Zayandeh-Rud River in central Iran chiefly depends on winter falls as snow for supplying water from wet regions in high Zagrous Mountains to the downstream, (semi-)arid, low-lying lands. In this study, the historical records (baseline: 1971–2000) of climate variables (temperature and precipitation) in the wet region were chosen to construct a probabilistic ensemble model using 15 GCMs in order to forecast future trends and changes while the Long Ashton Research Station Weather Generator (LARS-WG) was utilized to project climate variables under two A2 and B1 scenarios to a future period (2015–2044). Since future snow water equivalent (SWE) forecasts by GCMs were not available for the study area, an artificial neural network (ANN) was implemented to build a relationship between climate variables and snow water equivalent for the baseline period to estimate future snowfall amounts. As a last step, homogeneity and trend tests were performed to evaluate the robustness of the data series and changes were examined to detect past and future variations. Results indicate different characteristics of the climate variables at upstream stations. A shift is observed in the type of precipitation from snow to rain as well as in its quantities across the subregions. The key role in these shifts and the subsequent side effects such as water losses is played by temperature.

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Acknowledgment

The authors wish to thank the Isfahan Regional Water Company for providing data for this study.

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  1. Department of Civil Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    Hamid R. Safavi, Sayed Mahdi Sajjadi & Vahid Raghibi

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  1. Hamid R. Safavi
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Safavi, H.R., Sajjadi, S.M. & Raghibi, V. Assessment of climate change impacts on climate variables using probabilistic ensemble modeling and trend analysis. Theor Appl Climatol 130, 635–653 (2017). https://doi.org/10.1007/s00704-016-1898-3

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