Multi-model ensemble projections of European river floods and high flows at 1.5, 2, and 3 degrees global warming

Published by IOP Publishing Ltd. Severe river floods often result in huge economic losses and fatalities. Since 1980, almost 1500 such events have been reported in Europe. This study investigates climate change impacts on European floods under 1.5, 2, and 3 K global warming. The impacts are assessed employing a multi-model ensemble containing three hydrologic models (HMs: mHM, Noah-MP, PCR-GLOBWB) forced by five CMIP5 general circulation models (GCMs) under three Representative Concentration Pathways (RCPs 2.6, 6.0, and 8.5). This multi-model ensemble is unprecedented with respect to the combination of its size (45 realisations) and its spatial resolution, which is 5 km over the entirety of Europe. Climate change impacts are quantified for high flows and flood events, represented by 10% exceedance probability and annual maxima of daily streamflow, respectively. The multi-model ensemble points to the Mediterranean region as a hotspot of changes with significant decrements in high flows from -11% at 1.5 K up to -30% at 3 K global warming mainly resulting from reduced precipitation. Small changes ( < ±10%) are observed for river basins in Central Europe and the British Isles under different levels of warming. Projected higher annual precipitation increases high flows in Scandinavia, but reduced snow melt equivalent decreases flood events in this region. Neglecting uncertainties originating from internal climate variability, downscaling technique, and hydrologic model parameters, the contribution by the GCMs to the overall uncertainties of the ensemble is in general higher than that by the HMs. The latter, however, have a substantial share in the Mediterranean and Scandinavia. Adaptation measures for limiting the impacts of global warming could be similar under 1.5 K and 2 K global warming, but have to account for significantly higher changes under 3 K global warming.

[1]  Caspar A. Mücher,et al.  A climatic stratification of the environment of Europe , 2005 .

[2]  F. Piontek,et al.  A trend-preserving bias correction – the ISI-MIP approach , 2013 .

[3]  Sabine Attinger,et al.  The impact of standard and hard‐coded parameters on the hydrologic fluxes in the Noah‐MP land surface model , 2016 .

[4]  Z. Kundzewicz,et al.  Brief Communication: An update of the article "Modelling flood damages under climate change conditions - a case study for Germany" , 2015 .

[5]  J. Rogelj,et al.  Characterizing half‐a‐degree difference: a review of methods for identifying regional climate responses to global warming targets , 2017 .

[6]  E. Hawkins,et al.  Estimating Changes in Global Temperature since the Preindustrial Period , 2017 .

[7]  Hyungjun Kim,et al.  First look at changes in flood hazard in the Inter-Sectoral Impact Model Intercomparison Project ensemble , 2013, Proceedings of the National Academy of Sciences.

[8]  Dipan Kundu,et al.  A comparison of changes in river runoff from multiple global and catchment-scale hydrological models under global warming scenarios of 1 °C, 2 °C and 3 °C , 2016, Climatic Change.

[9]  B. Arheimer,et al.  Climate impact on floods: changes in high flows in Sweden in the past and the future (1911–2100) , 2014 .

[10]  C. Deser,et al.  Projecting North American Climate over the Next 50 Years: Uncertainty due to Internal Variability* , 2014 .

[11]  K. Beven,et al.  Comment on “Hyperresolution global land surface modeling: Meeting a grand challenge for monitoring Earth's terrestrial water” by Eric F. Wood et al. , 2012 .

[12]  F. Piontek,et al.  The Inter-Sectoral Impact Model Intercomparison Project (ISI–MIP): Project framework , 2013, Proceedings of the National Academy of Sciences.

[13]  D. Hannah,et al.  Future hydrological extremes: The uncertainty from multiple global climate and global hydrological models , 2015 .

[14]  A. Kay,et al.  Transient changes in flood frequency and timing in Britain under potential projections of climate change , 2012 .

[15]  F. Ludwig,et al.  Impacts of climate change on European hydrology at 1.5, 2 and 3 degrees mean global warming above preindustrial level , 2017, Climatic Change.

[16]  Kevin W. Manning,et al.  The community Noah land surface model with multiparameterization options (Noah-MP): 1. Model description and evaluation with local-scale measurements , 2011 .

[17]  Robert L. Wilby,et al.  Uncertainty in water resource model parameters used for climate change impact assessment , 2005 .

[18]  Michel Lang,et al.  Understanding Flood Regime Changes in Europe: A state of the art assessment , 2013 .

[19]  Daniela JacobJuliane,et al.  EURO-CORDEX: new high-resolution climate change projections for European impact research , 2013 .

[20]  Richard M. Vogel,et al.  Flow‐Duration Curves. I: New Interpretation and Confidence Intervals , 1994 .

[21]  Harsh L. Shah,et al.  Propagation of forcing and model uncertainties on to hydrological drought characteristics in a multi-model century-long experiment in large river basins , 2017, Climatic Change.

[22]  E. Sudicky,et al.  Hyper‐resolution global hydrological modelling: what is next? , 2015 .

[23]  P. Claps,et al.  Changing climate shifts timing of European floods , 2017, Science.

[24]  M. Bierkens,et al.  Global monthly water stress: 1. Water balance and water availability , 2011 .

[25]  Sabine Attinger,et al.  Implications of distributed hydrologic model parameterization on water fluxes at multiple scales and locations , 2013 .

[26]  R. Vautard,et al.  The European climate under a 2 °C global warming , 2014 .

[27]  P. Jones,et al.  A European daily high-resolution gridded data set of surface temperature and precipitation for 1950-2006 , 2008 .

[28]  Richard M. Vogel,et al.  On the probability distribution of daily streamflow in the United States , 2017 .

[29]  Sabine Attinger,et al.  Multiscale and Multivariate Evaluation of Water Fluxes and States over European River Basins , 2016 .

[30]  Andreas Gobiet,et al.  Empirical-statistical downscaling and error correction of regional climate models and its impact on the climate change signal , 2012, Climatic Change.

[31]  S. Attinger,et al.  Multiscale parameter regionalization of a grid‐based hydrologic model at the mesoscale , 2010 .

[32]  S. Kanae,et al.  Differences in flood hazard projections in Europe – their causes and consequences for decision making , 2016 .

[33]  F. Ludwig,et al.  Projections of future floods and hydrological droughts in Europe under a +2°C global warming , 2016, Climatic Change.

[34]  M. Ek,et al.  Hyperresolution global land surface modeling: Meeting a grand challenge for monitoring Earth's terrestrial water , 2011 .

[35]  Bengt Carlsson,et al.  Hydrological change--climate change impact simulations for Sweden. , 2004, Ambio.

[36]  C. Schär,et al.  Hydrological Climate-Impact Projections for the Rhine River: GCM–RCM Uncertainty and Separate Temperature and Precipitation Effects* , 2014 .

[37]  N. Wanders,et al.  Human and climate impacts on the 21st century hydrological drought , 2015 .

[38]  P. Pall,et al.  Projections of extreme precipitation events in regional climate simulations for Europe and the Alpine Region , 2013 .

[39]  L. Feyen,et al.  Global warming increases the frequency of river floods in Europe , 2015 .

[40]  F. Ludwig,et al.  European scale climate information services for water use sectors , 2015 .

[41]  Richard G. Jones,et al.  How representative is the spread of climate projections from the 5 CMIP5 GCMs used in ISI-MIP? , 2016 .

[42]  G. Blöschl,et al.  The June 2013 flood in the Upper Danube Basin, and comparisons with the 2002, 1954 and 1899 floods , 2013 .

[43]  Luc Feyen,et al.  Correction to “Assessment of future flood hazard in Europe using a large ensemble of bias‐corrected regional climate simulations” , 2012 .

[44]  Ashish Sharma,et al.  Global assessment of flood and storm extremes with increased temperatures , 2017, Scientific Reports.

[45]  Valentina Krysanova,et al.  Intercomparison of climate change impacts in 12 large river basins: overview of methods and summary of results , 2017, Climatic Change.

[46]  M. Clark,et al.  Effects of Hydrologic Model Choice and Calibration on the Portrayal of Climate Change Impacts , 2015 .