Jenine McCutcheon1,2, Stefanie Lutz3, Christopher Williamson4,5, Joseph M Cook6, Andrew J Tedstone4, Aubry Vanderstraeten7, Siobhan A Wilson8, Anthony Stockdale9, Steeve Bonneville7, Alexandre M Anesio10, Marian L Yallop5, James B McQuaid9, Martyn Tranter4,10, Liane G Benning9,3,11. 1. School of Earth & Environment, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK. jenine.mccutcheon@uwaterloo.ca. 2. Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, N2L 3G1, ON, Canada. jenine.mccutcheon@uwaterloo.ca. 3. GFZ German Research Centre for Geosciences, Telegrafenberg, 14473, Potsdam, Germany. 4. Bristol Glaciology Centre, University of Bristol, Bristol, BS8 1QU, UK. 5. School of Biosciences, University of Bristol, Bristol, BS8 1TQ, UK. 6. Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, SY23 3DA, UK. 7. Department of Geosciences, Environment and Society, Université Libre de Bruxelles, 1050, Bruxelles, Belgium. 8. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, T6G 2E3, Canada. 9. School of Earth & Environment, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK. 10. Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000, Roskilde, Denmark. 11. Department of Earth Sciences, Free University of Berlin, 12249, Berlin, Germany.
Abstract
Melting of the Greenland Ice Sheet is a leading cause of land-ice mass loss and cryosphere-attributed sea level rise. Blooms of pigmented glacier ice algae lower ice albedo and accelerate surface melting in the ice sheet's southwest sector. Although glacier ice algae cause up to 13% of the surface melting in this region, the controls on bloom development remain poorly understood. Here we show a direct link between mineral phosphorus in surface ice and glacier ice algae biomass through the quantification of solid and fluid phase phosphorus reservoirs in surface habitats across the southwest ablation zone of the ice sheet. We demonstrate that nutrients from mineral dust likely drive glacier ice algal growth, and thereby identify mineral dust as a secondary control on ice sheet melting.
Melting of the Greenland Ice Sheet is a leading cause of land-ice mass loss and cryosphere-attributed sea level rise. Blooms of pigmented glacier ice pan> class="Species">algae lower ice albedo and accelerate surface melting in the ice sheet's southwest sector. Although glacier ice algae cause up to 13% of the surface melting in this region, the controls on bloom development remain poorly understood. Here we show a direct link between mineral phosphorus in surface ice and glacier ice algae biomass through the quantification of solid and fluid phase phosphorus reservoirs in surface habitats across the southwest ablation zone of the ice sheet. We demonstrate that nutrients from mineral dust likely drive glacier ice algal growth, and thereby identify mineral dust as a secondary control on ice sheet melting.
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