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Climate controls on water chemistry states and dynamics in rivers across Australia
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  • Anna Lintern,
  • Shuci Liu,
  • Camille Minaudo,
  • Rémi Dupas,
  • Danlu Guo,
  • kefeng zhang,
  • Ulrike Bende-Michl,
  • Clément Duvert
Anna Lintern
Monash University

Corresponding Author:anna.lintern@monash.edu

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Shuci Liu
The University of Melbourne Department of Infrastructure Engineering
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Camille Minaudo
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Rémi Dupas
Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement
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Danlu Guo
University of Melbourne
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kefeng zhang
University of New South Wales
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Ulrike Bende-Michl
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Clément Duvert
Charles Darwin University
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We need to understand spatial variability in the mean concentrations and dynamics of riverine water quality for effective water quality management. Using river chemistry data for up to 578 locations across the Australian continent, we assessed the impact of climate zones on (i) interannual mean concentration and (ii) river chemistry dynamics as represented by constituent export regimes (ratio of the coefficients of variation of concentration and discharge) and export patterns (slope of the concentration-discharge relationship). We found that interannual mean concentrations vary significantly by climate zones. However, export regimes and patterns are generally consistent across climate zones. This suggests that intrinsic properties of individual constituents rather than catchment properties determine export regimes and patterns. The spatially consistent river chemistry dynamics highlights the potential to predict riverine water quality across the Australian continent, which will support national riverine water quality management.