Glacier shrinkage driving global changes in downstream systems

Alexander M. Milner*, Kieran Khamis, Tom J. Battin, John E. Brittain, Nicholas E. Barrand, Leopold Füreder, Sophie Cauvy-Fraunié, Gísli Már Gíslason, Dean Jacobsen, David M. Hannah, Andrew J. Hodson, Eran Hood, Valeria Lencioni, Jón S. Ólafsson, Christopher T Robinson, Martyn Tranter, Lee E. Brown

*Corresponding author for this work

Research output: Contribution to journalReview article (Academic Journal)

112 Citations (Scopus)
309 Downloads (Pure)

Abstract

Glaciers cover ~10% of the Earth’s land surface, but they are shrinking rapidly across most parts of the world, leading to cascading impacts on downstream systems. Glaciers impart unique footprints on river flow at times when other water sources are low. Changes in river hydrology and morphology caused by climate-induced glacier loss are projected to be the greatest of any hydrological system, with major implications for riverine and near-shore marine environments. Here, we synthesize current evidence of how glacier shrinkage will alter hydrological regimes, sediment transport, and biogeochemical and contaminant fluxes from rivers to oceans. This will profoundly influence the natural environment, including many facets of biodiversity, and the ecosystem services that glacier-fed rivers provide to humans, particularly provision of water for agriculture, hydropower, and consumption. We conclude that human society must plan adaptation and mitigation measures for the full breadth of impacts in all affected regions caused by glacier shrinkage.

Original languageEnglish
Pages (from-to)9770-9778
Number of pages9
JournalProceedings of the National Academy of Sciences of the United States of America
Volume114
Issue number37
Early online date5 Sep 2017
DOIs
Publication statusPublished - 12 Sep 2017

Keywords

  • Biodiversity
  • Biogeochemistry
  • Ecosystem services
  • Glacier
  • Runoff

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