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- B11G-1535: Gradients of Deposition and In Situ Production Drive Global Glacier Organic Matter Composition
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Board 1535‚ Hall EFG (Poster Hall)NOLA CC
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Robert Spencer, Florida State University (First Author, Presenting Author)
Amy McKenna, Florida State University
Anne Kellerman, Florida State University
Battin Tom, Ecole Polytechnique Federale de Lausanne
Jason Fellman, University of Alaska Southeast
Eran Hood, University of Alaska Southeast
Hannes Peter, EPFL
Martina Schon, EPFL
Vincent De Staercke, EPFL
Michael Styllas, EPFL
Matteo Tolosano, EPFL
Amy Holt, Florida State University
The controls on glacier organic matter composition globally remain poorly constrained, despite the importance of this material for downstream carbon cycling, and freshwater and marine ecosystems. We present the first systematic global analysis of glacier dissolved organic matter and demonstrate that its composition is largely determined by the relative balance of organic material derived from in situ production versus atmospheric deposition. As a result, globally, glaciers can be considered a diverse organic matter pool, exporting regionally distinct material to recipient ecosystems. Glaciers relatively dominated by atmospheric-derived organics export older and more stable material with ramifications for the fate of glacier-derived carbon in recipient ecosystems. Ultimately, this work highlights glaciers globally as having a dynamic role in carbon cycling.
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