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Article Dans Une Revue Geophysical Research Letters Année : 2022

Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams

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With rising temperatures, glaciers are retreating globally. The Greenland icecap has experienced record melt in the past decade (The IMBIE Team, 2020), amplifying freshwater discharge and transport of sediment and dissolved constituents (Hawkings et al., 2015; Meire et al., 2016). Cascading effects on downstream ecosystems remain uncertain, as additional nutrient input could enhance primary productivity in marine environments (e.g., Arrigo et al., 2017; Meire et al., 2017). Conversely, increased turbidity caused by the generally high suspended sediment loads of glacial outflow limits light penetration and thereby suppresses phytoplankton growth (Holding et al., 2019; Hopwood et al., 2020). In addition, retreating icecaps and glaciers expose previously covered landscapes to erosion, generally causing elevated sediment release until stabilization by colonizing vegetation (e.g., Ballantyne, 2002). Erosion rates are projected to increase throughout the Arctic due to rapid thaw and destabilization of permafrost (e.g., Hugelius et al., 2020; Olefeldt et al., 2016; Turetsky et al., 2020), as well as intensifying rain events caused by a shift from snow-to rain-dominated precipitation (e.g., Bintanja & Andry, 2017). Erosion of soils or recent vegetation litter can act as a carbon sink on geological timescales if the released organic carbon (OC) is rapidly buried in marine sediments (e.g., Hilton et al., 2015; Hovius et al., 2011). On the other hand, erosion constitutes a carbon source to the atmosphere if ancient permafrost soil or rock-derived (petrogenic) carbon is mineralized during transport or in marine environments (e.g.,
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hal-03885003 , version 1 (05-12-2022)

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Lisa Bröder, Catherine Hirst, Sophie Opfergelt, M. Thomas, Jorien E. Vonk, et al.. Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams. Geophysical Research Letters, 2022, 49 (21), We would like to express our gratitude to the staff at Zackenberg Research Station and operators of the GEM database. We also wish to acknowledge the Laboratory of Ion Beam Physics for support of the AMS 14C measurements. The authors received funding for the field campaign from INTERACT under the European Union H2020 Grant 871120 to L.B. Further funding for this work came from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (ERC Starting Grant, WeThaw, Grant 714617) to S.O. and (ERC Starting Grant, Thawsome, Grant 676982) to J.V. Last but not least,e2022GL101210. ⟨10.1029/2022gl101210⟩. ⟨hal-03885003⟩
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