globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2014378117
论文题名:
Enhanced trace element mobilization by Earth's ice sheets
作者: Hawkings J.R.; Skidmore M.L.; Wadham J.L.; Priscu J.C.; Morton P.L.; Hatton J.E.; Gardner C.B.; Kohler T.J.; Stibal M.; Bagshaw E.A.; Steigmeyer A.; Barker J.; Dore J.E.; Berry Lyons W.; Tranter M.; Spencer R.G.M.; SALSA Science Team
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:50
起始页码: 31648
结束页码: 31659
语种: 英语
英文关键词: Biogeochemical cycles ; Elemental cycles ; Ice sheets ; Southern Ocean ; Trace elements
英文摘要: Trace elements sustain biological productivity, yet the significance of trace element mobilization and export in subglacial runoff from ice sheets is poorly constrained at present. Here, we present size-fractionated (0.02, 0.22, and 0.45 μm) concentrations of trace elements in subglacial waters from the Greenland Ice Sheet (GrIS) and the Antarctic Ice Sheet (AIS). Concentrations of immobile trace elements (e.g., Al, Fe, Ti) far exceed global riverine and open ocean mean values and highlight the importance of subglacial aluminosilicate mineral weathering and lack of retention of these species in sediments. Concentrations are higher from the AIS than the GrIS, highlighting the geochemical consequences of prolonged water residence times and hydrological isolation that characterize the former. The enrichment of trace elements (e.g., Co, Fe, Mn, and Zn) in subglacial meltwaters compared with seawater and typical riverine systems, together with the likely sensitivity to future ice sheet melting, suggests that their export in glacial runoff is likely to be important for biological productivity. For example, our dissolved Fe concentration (20,900 nM) and associated flux values (1.4 Gmol y−1) from AIS to the Fe-deplete Southern Ocean exceed most previous estimates by an order of magnitude. The ultimate fate of these micronutrients will depend on the reactivity of the dominant colloidal size fraction (likely controlled by nanoparticulate Al and Fe oxyhydroxide minerals) and estuarine processing. We contend that ice sheets create highly geochemically reactive particulates in subglacial environments, which play a key role in trace elemental cycles, with potentially important consequences for global carbon cycling. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162053
Appears in Collections:气候变化与战略

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作者单位: Hawkings, J.R., National High Magnetic Field Laboratory Geochemistry Group, Department of Earth, Ocean and Atmospheric Sciences, Florida State University, Tallahassee, FL 32306, United States, Interface Geochemistry, German Research Centre for Geosciences (GFZ), Potsdam, 14473, Germany; Skidmore, M.L., Department of Earth Sciences, Montana State University, Bozeman, MT 59717, United States; Wadham, J.L., School of Geographical Sciences, University of Bristol, Bristol, BS8 1SS, United Kingdom; Priscu, J.C., Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, United States; Morton, P.L., National High Magnetic Field Laboratory Geochemistry Group, Department of Earth, Ocean and Atmospheric Sciences, Florida State University, Tallahassee, FL 32306, United States; Hatton, J.E., School of Earth Sciences, University of Bristol, Bristol, BS8 1RL, United Kingdom; Gardner, C.B., School of Earth Sciences, Byrd Polar and Climate Research Center, Ohio State University, Columbus, OH 43210, United States; Kohler, T.J., Stream Biofilm and Ecosystem Research Laboratory, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, CH-1015, Switzerland; Stibal, M., Department of Ecology, Faculty of Science, Charles University, Prague, CZ-12844, Czech Republic; Bagshaw, E.A., School of Earth and Ocean Sciences, Cardiff University, Cardiff, CF10 3AT, United Kingdom; Steigmeyer, A., Department of Earth Sciences, Montana State University, Bozeman, MT 59717, United States; Barker, J., Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN 55455, United States; Dore, J.E., Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, United States; Berry Lyons, W., School of Earth Sciences, Byrd Polar and Climate Research Center, Ohio State University, Columbus, OH 43210, United States; Tranter, M., School of Geographical Sciences, University of Bristol, Bristol, BS8 1SS, United Kingdom; Spencer, R.G.M., National High Magnetic Field Laboratory Geochemistry Group, Department of Earth, Ocean and Atmospheric Sciences, Florida State University, Tallahassee, FL 32306, United States; SALSA Science Team

Recommended Citation:
Hawkings J.R.,Skidmore M.L.,Wadham J.L.,et al. Enhanced trace element mobilization by Earth's ice sheets[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(50)
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