Geochemical characterization and material properties of coastal permafrost near Drew Point, Alaska

Bristol, E. M.; Connolly, Craig T.; Lorenson, Thomas D.; Richmond, Bruce M.; Ilgen, Anastasia Gennadyevna; Choens, Robert Charles; Bull, Diana L; Kanevskiy, Mikhail; Iwahana, Go; Jones, Benjamin M.; McClelland, J. W.

doi:10.6073/pasta/cc4d53a91ed873765224fcb6d09f5eb7

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“…Percent values in parentheticals represent the contribution of each horizons to the bluff. TOC stocks were calculated using data from Bristol et al (2020Bristol et al ( , 2021. DOC yields were estimated using our 24 hr experimental leaching yields.…”

Section: Discussionmentioning

confidence: 99%

“…Geochemical data including soil and permafrost leaching yields, biodegradability measurements, and summarized DOM composition data are available at Environmental Data Initiative (https://doi.org/10.6073/pasta/ bffc3d4e9cdc255ff0e8582d668c006e;Bristol et al, 2024). Soil and permafrost data used to estimate total organic carbon stocks at Drew Point are available at Environmental Data Initiative (https://doi.org/10.6073/pasta/ cc4d53a91ed873765224fcb6d09f5eb7;Bristol et al, 2020). Raw FT-ICR MS data files are available at Open Science Framework (https://doi.org/10.17605/OSF.IO/MD2YZ;McKenna et al, 2024).…”

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confidence: 99%

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Eroding Permafrost Coastlines Release Biodegradable Dissolved Organic Carbon to the Arctic Ocean

Bristol,

Behnke,

Spencer

et al. 2024

JGR Biogeosciences

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Coastal erosion mobilizes large quantities of organic matter (OM) to the Arctic Ocean where it may fuel greenhouse gas emissions and marine production. While the biodegradability of permafrost‐derived dissolved organic carbon (DOC) has been extensively studied in inland soils and freshwaters, few studies have examined dissolved OM (DOM) leached from eroding coastal permafrost in seawater. To address this knowledge gap, we sampled three horizons from bluff exposures near Drew Point, Alaska: seasonally thawed active layer soils, permafrost containing Holocene terrestrial and/or lacustrine OM, and permafrost containing late‐Pleistocene marine‐derived OM. Samples were leached in seawater to compare DOC yields, DOM composition (chromophoric DOM, Fourier transform ion cyclotron resonance mass spectrometry), and biodegradable DOC (BDOC). Holocene terrestrial permafrost leached the most DOC compared to active layer soils and Pleistocene marine permafrost. However, DOC from Pleistocene marine permafrost was the most biodegradable (33 ± 6% over 90 days), followed by DOC from active layer soils (23 ± 5%) and Holocene terrestrial permafrost (14 ± 3%). Permafrost leachates contained relatively more aliphatic and peptide‐like formulae, whereas active layer leachates contained relatively more aromatic formulae. BDOC was positively correlated with nitrogen‐containing and aliphatic formulae, and negatively correlated with polyphenolic and condensed aromatic formulae. Using estimates of eroding OM, we scale our results to estimate DOC and BDOC inputs to the Alaska Beaufort Sea. While DOC inputs from coastal erosion are relatively small compared to rivers, our results suggest that erosion may be an important source of BDOC to the Beaufort Sea when river inputs are low.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%