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Arctic shallows trap permafrost plant carbon
The 0–5 m Arctic coastal zone holds most coarse, plant-debris terrestrial organic carbon from thawing permafrost before the shelf sees mainly fine mineral-bound carbon.
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What coastal depths form the key terrOC filter?
The 0–5 m zone, split into wave-dominated 0–2 m and quieter 2–5 m.
Source: Shallow coastal zones are key mediators in Arctic land-ocean carbon fluxes · DOI · quote verified
How does LD OC change from land to shelf?
From 43 ± 22% of OC in parent material to 11 ± 6% on the shelf.
Source: Shallow coastal zones are key mediators in Arctic land-ocean carbon fluxes · DOI · quote verified
What dominates mid-shelf terrOC?
Fine HD <38 μm mineral-associated OC; LD only about 10%.
Source: Shallow coastal zones are key mediators in Arctic land-ocean carbon fluxes · DOI · quote verified
How much incoming OC is matrix-free plant debris?
About 43 ± 22% in the LD fraction from erosion and river input.
Source: Shallow coastal zones are key mediators in Arctic land-ocean carbon fluxes · DOI · quote verified
What δ13C marks coarse HD material in 0–2 m?
More depleted values, about −26.5‰ to −28.3‰, indicating fresh terrestrial carbon.
Source: Shallow coastal zones are key mediators in Arctic land-ocean carbon fluxes · DOI · quote verified
Are plant fragments found on the shelf?
They dominate 0–5 m and are virtually absent on the shelf.
Source: Shallow coastal zones are key mediators in Arctic land-ocean carbon fluxes · DOI · quote verified
How large is the Arctic permafrost carbon reservoir cited?
About 1300 Pg of organic carbon.
Source: Shallow coastal zones are key mediators in Arctic land-ocean carbon fluxes · DOI · quote verified
How long was the coastal transect?
2030 km, five locations plus Mackenzie trap and Beaufort shelf.
Source: Shallow coastal zones are key mediators in Arctic land-ocean carbon fluxes · DOI · quote verified
What density cut-off defined LD versus HD?
1.8 g cm−3, plus sieving at 38, 63, and 200 μm.
Source: Shallow coastal zones are key mediators in Arctic land-ocean carbon fluxes · DOI · quote verified
How can 0–5 m act as bypass or accumulation?
Steep, energetic sites export fines; flat, dissipative sites retain HD <38 μm muds.
Source: Shallow coastal zones are key mediators in Arctic land-ocean carbon fluxes · DOI · quote verified
What OC% can coarse HD reach in 2–5 m?
It regularly exceeds 1% and sometimes even 10% because of plant debris.
Source: Shallow coastal zones are key mediators in Arctic land-ocean carbon fluxes · DOI · quote verified