Molecular-level characterization of supraglacial dissolved and water-extractable organic matter along a hydrological flow path in a Greenland Ice Sheet micro-catchment
Eva L. Doting,Ian T. Stevens,Anne M. Kellerman,Pamela E. Rossel,Runa Antony,Amy M. McKenna,Martyn Tranter,Liane G. Benning,Robert G. M. Spencer,Jon R. Hawkings,and Alexandre M. Anesio
National High Magnetic Field Laboratory Geochemistry Group and Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL 32310, USA
Interface Geochemistry Section, German Research Centre for Geosciences, GFZ Potsdam, 14473 Potsdam, Germany
Department of Earth Science, Freie Universität Berlin, 12249 Berlin, Germany
Robert G. M. Spencer
National High Magnetic Field Laboratory Geochemistry Group and Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL 32310, USA
Jon R. Hawkings
Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA 19104, USA
Department of Geosciences, Centre for Ice, Cryosphere, Carbon and Climate (iC3), UiT The Arctic University of Norway, 9010 Tromsø, Norway
Alexandre M. Anesio
Department of Environmental Science, iClimate, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
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This study provides the first evidence for biogeochemical cycling of supraglacial dissolved organic matter (DOM) in meltwater flowing through the porous crust of weathering ice that covers glacier ice surfaces during the melt season. Movement of water through the weathering crust is slow, allowing microbes and solar radiation to alter the DOM in glacial meltwaters. This is important as supraglacial meltwaters deliver DOM to downstream aquatic environments.
This study provides the first evidence for biogeochemical cycling of supraglacial dissolved...
