Selective preservation of old organic carbon fluvially released from sub-Arctic soils

Details Selective preservation of old organic carbon fluvially released from sub-Arctic soils Selective preservation of old organic carbon fluvially released from sub-Arctic soils

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3711605v&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 11, CiteID L11605

Mathematics

Logic

3

Biogeosciences: Carbon Cycling (4806), Oceanography: Biological And Chemical: Marine Organic Chemistry (0470, 1050), Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912)

Scientific paper

Amplified climate warming in the Arctic may cause thaw-remobilization of its large soil organic carbon (SOC) pool. Here we assess the remobilization and preservation of old SOC by the watershed-integrated radiocarbon signature of molecular SOC markers released from northernmost Scandinavia. The radiocarbon analyses revealed a remarkable fractionation for identical vascular plant markers (˜420‰ or ˜6000 14C years) upon settling from surface water to the underlying sediments. From this, we infer fluvial export of two SOC pools; a young surface peat component, and an old deep mineral soil component. The young pool exists as an easily degradable humic suspension, while the old pool is matrix protected from degradation and ballasted for preferential settling. The two soil types with highest OC in Arctic permafrost evidently exhibit different susceptibilities to degradation. Hence, a significant part of the thaw-released OC may simply be fluvially relocated to sediments instead of being emitted to the atmosphere.

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