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Propagation of forcing and model uncertainties on to hydrological drought characteristics in a multi-model century-long experiment in large river basins

Author

Listed:
  • L. Samaniego

    (UFZ-Helmholtz Centre for Environmental Research)

  • R. Kumar

    (UFZ-Helmholtz Centre for Environmental Research)

  • L. Breuer

    (Justus Liebig University Gießen)

  • A. Chamorro

    (Justus Liebig University Gießen)

  • M. Flörke

    (Universität Kassel)

  • I. G. Pechlivanidis

    (Swedish Meteorological and Hydrological Institute)

  • D. Schäfer

    (UFZ-Helmholtz Centre for Environmental Research)

  • H. Shah

    (Indian Institute of Technology Gandhinagar)

  • T. Vetter

    (Potsdam Institute for Climate Impact Research)

  • M. Wortmann

    (Potsdam Institute for Climate Impact Research)

  • X. Zeng

    (Huazhong University of Science & Technology)

Abstract

Recent climate change impact studies studies have presented conflicting results regarding the largest source of uncertainty in essential hydrological variables, especially streamflow and derived characteristics that describe the evolution of drought events. Part of the problem arises from the lack of a consistent framework to address compatible initial conditions for the impact models and a set of standardized historical and future forcings. The ISI-MIP2 project provides a good opportunity to advance our understanding of the propagation of forcing and model uncertainties on to century-long time series of drought characteristics using an ensemble of hydrological model (HM) projections across a broad range of climate scenarios and regions. To achieve this goal, we used six regional preconditioned hydrological models set up in seven large river basins: Upper-Amazon, Blue-Nile, Ganges, Upper-Niger, Upper-Mississippi, Rhine, and Upper-Yellow. These models were forced with bias-corrected outputs from five CMIP5 general circulation models (GCMs) under two extreme representative concentration pathway scenarios (i.e., RCP2.6 and RCP8.5) for the period 1971-2099. The simulated streamflow was transformed into a monthly runoff index (RI) to analyze the attributions of the GCM and HM uncertainties on to drought magnitudes and durations over time. The results indicated that GCM uncertainty mostly dominated over HM uncertainty for the projections of runoff drought characteristics, irrespective of the selected RCP and region. In general, the overall uncertainty increased with time. The uncertainty in the drought characteristics increased as the radiative forcing of the RCP increased, but the propagation of the GCM uncertainty on to a drought characteristic depended largely upon the hydro-climatic regime. Although our study emphasizes the need for multi-model ensembles for the assessment of future drought projections, the agreement between the GCM forcings was still too weak to draw conclusive recommendations.

Suggested Citation

  • L. Samaniego & R. Kumar & L. Breuer & A. Chamorro & M. Flörke & I. G. Pechlivanidis & D. Schäfer & H. Shah & T. Vetter & M. Wortmann & X. Zeng, 2017. "Propagation of forcing and model uncertainties on to hydrological drought characteristics in a multi-model century-long experiment in large river basins," Climatic Change, Springer, vol. 141(3), pages 435-449, April.
  • Handle: RePEc:spr:climat:v:141:y:2017:i:3:d:10.1007_s10584-016-1778-y
    DOI: 10.1007/s10584-016-1778-y
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    References listed on IDEAS

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    1. Aiguo Dai, 2013. "Increasing drought under global warming in observations and models," Nature Climate Change, Nature, vol. 3(1), pages 52-58, January.
    2. Aiguo Dai, 2013. "Erratum: Increasing drought under global warming in observations and models," Nature Climate Change, Nature, vol. 3(2), pages 171-171, February.
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    1. Ahmed Elkouk & Zine El Abidine Morjani & Yadu Pokhrel & Abdelghani Chehbouni & Abdelfattah Sifeddine & Stephan Thober & Lhoussaine Bouchaou, 2021. "Multi-model ensemble projections of soil moisture drought over North Africa and the Sahel region under 1.5, 2, and 3 °C global warming," Climatic Change, Springer, vol. 167(3), pages 1-18, August.

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