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Assessing climate change impacts on hydrology from an ensemble of regional climate models, model scales and linking methods – a case study on the Lule River basin

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Abstract

This paper investigates how using different regional climate model (RCM) simulations affects climate change impacts on hydrology in northern Europe using an offline hydrological model. Climate change scenarios from an ensemble of seven RCMs, two global climate models (GCMs), two global emissions scenarios and two RCMs of varying resolution were used. A total of 15 climate change simulations were included in studies on the Lule River basin in Northern Sweden. Two different approaches to transfer climate change from the RCMs to hydrological models were tested. A rudimentary estimate of change in hydropower potential on the Lule River due to climate change was also made. The results indicate an overall increase in river flow, earlier spring peak flows and an increase in hydropower potential. The two approaches for transferring the signal of climate change to the hydrological impacts model gave similar mean results, but considerably different seasonal dynamics, a result that is highly relevant for other types of climate change impacts studies.

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Authors and Affiliations

  1. Swedish Meteorological and Hydrological Institute, SE-60176, Norrköping, Sweden

    L. Phil Graham, Johan Andréasson & Bengt Carlsson

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  1. L. Phil Graham
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  2. Johan Andréasson
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  3. Bengt Carlsson
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Correspondence to L. Phil Graham.

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Graham, L.P., Andréasson, J. & Carlsson, B. Assessing climate change impacts on hydrology from an ensemble of regional climate models, model scales and linking methods – a case study on the Lule River basin. Climatic Change 81 (Suppl 1), 293–307 (2007). https://doi.org/10.1007/s10584-006-9215-2

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  • DOI: https://doi.org/10.1007/s10584-006-9215-2

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