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Title: Future hydrological extremes: The uncertainty from multiple global climate and global hydrological models
Authors: Giuntoli, Ignazio
Vidal, Jean-Philippe
Prudhomme, Christel
Hannah, David M.
Issue Date: 2015
Publisher: © The Authors. Published by Copernicus Publications on behalf of the European Geosciences Union.
Citation: GIUNTOLLI, I. ... et al., 2015. Future hydrological extremes: The uncertainty from multiple global climate and global hydrological models. Earth System Dynamics, 6(1), pp. 267-285.
Abstract: © Author(s) 2015. Projections of changes in the hydrological cycle from global hydrological models (GHMs) driven by global climate models (GCMs) are critical for understanding future occurrence of hydrological extremes. However, uncertainties remain large and need to be better assessed. In particular, recent studies have pointed to a considerable contribution of GHMs that can equal or outweigh the contribution of GCMs to uncertainty in hydrological projections. Using six GHMs and five GCMs from the ISI-MIP multi-model ensemble, this study aims: (i) to assess future changes in the frequency of both high and low flows at the global scale using control and future (RCP8.5) simulations by the 2080s, and (ii) to quantify, for both ends of the runoff spectrum, GCMs and GHMs contributions to uncertainty using a two-way ANOVA. Increases are found in high flows for northern latitudes and in low flows for several hotspots. Globally, the largest source of uncertainty is associated with GCMs, but GHMs are the greatest source in snow-dominated regions. More specifically, results vary depending on the runoff metric, the temporal (annual and seasonal) and regional scale of analysis. For instance, uncertainty contribution from GHMs is higher for low flows than it is for high flows, partly owing to the different processes driving the onset of the two phenomena (e.g. the more direct effect of the GCMs' precipitation variability on high flows). This study provides a comprehensive synthesis of where future hydrological extremes are projected to increase and where the ensemble spread is owed to either GCMs or GHMs. Finally, our results underline the need for improvements in modelling snowmelt and runoff processes to project future hydrological extremes and the importance of using multiple GCMs and GHMs to encompass the uncertainty range provided by these two sources.
Description: This is an Open Access Article. It is published by Copernicus Press under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/
Version: Published
DOI: 10.5194/esd-6-267-2015
URI: https://dspace.lboro.ac.uk/2134/20924
Publisher Link: http://dx.doi.org/10.5194/esd-6-267-2015
ISSN: 2190-4979
Appears in Collections:Published Articles (Geography and Environment)

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