Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 44, Issue 22, Pages 11491-11500Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL075543
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Funding
- National Science Foundation (NSF EAGER Grant) [ARC-0935336]
- National Science Foundation (NSF Grant) [OPP-80937700, ARC-1023623]
- Jon and Beverly Thompson Endowed Chair of Geological Sciences
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The deposition of terrestrial-derived permafrost particulate organic carbon (POC) has been recorded in major Arctic river deltas. However, associated transport pathways of permafrost POC from the watershed to the coast have not been well constrained. Here we utilized a combination of ramped pyrolysis-oxidation radiocarbon analysis (RPO C-14) along with lignin biomarkers, to track the linkages between soils and river and delta sediments. Surface and deep soils showed distinct RPO thermographs which may be related to degradation and organo-mineral interaction. Soil material in the bed load of the river channel was mostly derived from deep old permafrost. Both surface and deep soils were transported and deposited to the coast. Hydrodynamic sorting and barrier island protection played important roles in terrestrial-derived permafrost POC deposition near the coast. On a large scale, ice processes (e.g., ice gauging and strudel scour) and ocean currents controlled the transport and distribution of permafrost POC on the Beaufort Shelf.
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