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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 6
Hydrol. Earth Syst. Sci., 21, 3231–3247, 2017
https://doi.org/10.5194/hess-21-3231-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Hydrol. Earth Syst. Sci., 21, 3231–3247, 2017
https://doi.org/10.5194/hess-21-3231-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 30 Jun 2017

Research article | 30 Jun 2017

Climate and basin drivers of seasonal river water temperature dynamics

Cédric L. R. Laizé1,2, Cristian Bruna Meredith2,a, Michael J. Dunbar1,b, and David M. Hannah2 Cédric L. R. Laizé et al.
  • 1Centre for Ecology and Hydrology, Wallingford, UK
  • 2School of Geography, Earth, & Environmental Sciences, University of Birmingham, Birmingham, UK
  • anow at: Scottish Environment Protection Agency, Arbroath, UK
  • bnow at: Environmental Agency, Reading, UK

Abstract. Stream water temperature is a key control of many river processes (e.g. ecology, biogeochemistry, hydraulics) and services (e.g. power plant cooling, recreational use). Consequently, the effect of climate change and variability on stream temperature is a major scientific and practical concern. This paper aims (1) to improve the understanding of large-scale spatial and temporal variability in climate–water temperature associations, and (2) to assess explicitly the influence of basin properties as modifiers of these relationships. A dataset was assembled including six distinct modelled climatic variables (air temperature, downward short-wave and long-wave radiation, wind speed, specific humidity, and precipitation) and observed stream temperatures for the period 1984–2007 at 35 sites located on 21 rivers within 16 basins (Great Britain geographical extent); the study focuses on broad spatio-temporal patterns, and hence was based on 3-month-averaged data (i.e. seasonal). A wide range of basin properties was derived. Five models were fitted (all seasons, winter, spring, summer, and autumn). Both site and national spatial scales were investigated at once by using multi-level modelling with linear multiple regressions. Model selection used multi-model inference, which provides more robust models, based on sets of good models, rather than a single best model. Broad climate–water temperature associations common to all sites were obtained from the analysis of the fixed coefficients, while site-specific responses, i.e. random coefficients, were assessed against basin properties with analysis of variance (ANOVA). All six climate predictors investigated play a role as a control of water temperature. Air temperature and short-wave radiation are important for all models/seasons, while the other predictors are important for some models/seasons only. The form and strength of the climate–stream temperature association vary depending on season and on water temperature. The dominating climate drivers and physical processes may change across seasons and across the stream temperature range. The role of basin permeability, size, and elevation as modifiers of the climate–water temperature associations was confirmed; permeability has the primary influence, followed by size and elevation. Smaller, upland, and/or impermeable basins are the most influenced by atmospheric heat exchanges, while larger, lowland and permeable basins are the least influenced. The study showed the importance of accounting properly for the spatial and temporal variability of climate–stream temperature associations and their modification by basin properties.

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Stream temperature controls many river processes, making it vital to know how climate affects it. Climate and stream temperatures at 35 British sites and associated basin properties were used to model climate–water temperature associations and to assess how they are influenced by basins. Associations vary with season and water temperature range. Basin permeability, size, and elevation have the main influence; smaller upland or impermeable basins are the most sensitive to climate.
Stream temperature controls many river processes, making it vital to know how climate affects...
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