Fig. 3: Comparison of organic carbon in subsea permafrost in the Buor-Khaya Bay with other deposits in northeast Siberia.

Shown are organic carbon (OC) content, total organic carbon over total nitrogen (OC/TN), and organic carbon δ13C values. All data from cores 4D-13, 2D-13, 4D-12, 5D-13, and on OC/TN and δ13C from core 1D-14 are from this study. Data from previous studies include OC in 1D-1438 and BK-228,40, terrestrial deposits such as Ice Complex deposits (ICD), taberites, thermoerosion (thermoeros.), and thermokarst/lake deposits (thermok.) of different deposition age2, as well as Buor-Khaya Bay surface sediments14,37, fluvial and alluvial (fl., alluv.) deposits that are affected by translocation. Box plots show medians with 25th and 75th percentiles as box limits, minimum/maximum values as whiskers, and numbers of observations in italics.