Abstract :
[en] AbstractMelting glacier ice surfaces host active microbial communities that enhance glacial melt, contribute to biogeochemical cycling, and nourish downstream ecosystems; but these communities remain poorly characterised. Over the coming decades, the forecast ‘peak melt’ of Earth’s glaciers necessitates an improvement in understanding the state and fate of supraglacial ecosystems to better predict the effects of climate change upon glacial surfaces and catchment biogeochemistry. Here we show a regionally consistent mean microbial abundance of 104 cells mL−1 in surface meltwaters from eight glaciers across Europe and North America, and two sites in western Greenland. Microbial abundance is correlated with suspended sediment concentration, but not with ice surface hydraulic properties. We forecast that release of these microbes from surfaces under a medium carbon emission scenario (RCP 4.5) will deliver 2.9 × 1022 cells yr−1, equivalent to 0.65 million tonnes yr−1 of cellular carbon, to downstream ecosystems over the next ~80 years.
Funders :
Royal Geographical Society
Aberystwyth University
NERC - Natural Environment Research Council
Royal Society
Climate Change Consortium for Wales (C3W) EU INTERACT
Higher Education Funding Council for Wales
EU INTERACT Welsh Government and Higher Education Funding Council for Wales (HEFCW): See Cymru National Research Network
Rolex Awards for Enterprise
Gouvernement du Canada | Natural Sciences and Engineering Research Council of Canada
Polar Continental Shelf Project
Scopus citations®
without self-citations
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