Fig. 4: Comparison of n-alkane source proxies in subsea permafrost with other deposits in Siberia. | Nature Communications

Fig. 4: Comparison of n-alkane source proxies in subsea permafrost with other deposits in Siberia.

From: Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea

Fig. 4

Subsea permafrost data represent the thaw front of cores 4D-13, 2D-13, and 4D-12 from the Buor-Khaya Bay. Shown are terrigenous-aquatic ratios (TAR) reflecting the contribution of aquatic (aqu.) and land-derived (terr.) material, and C25/(C25 + C29) n-alkane ratios reflecting Sphagnum contribution. Data from previous studies show terrestrial deposits from peat and non-peat locations including Ice Complex deposits (ICD)36,44, Holocene thermokarst36, peat permafrost45, and active layer (AL) material44,45, as well as translocated material including Buor-Khaya Bay surface sediments (sed.)42,46 and Kolyma river suspended matter47. Box plots show medians with 25th and 75th percentiles as box limits, minimum/maximum values as whiskers, and numbers of observations in italics.

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