Delivery of aged terrestrial organic matter to the Laptev Sea during the last deglaciation

Nicolas, Arnaud; Hefter, Jens; Grotheer, Hendrik; Tesi, Tommaso; Stein, Ruediger; Nogarotto, Alessio; Alves, Eduardo Queiroz; Mollenhauer, Gesine

doi:10.5194/cp-21-2579-2025

Articles | Volume 21, issue 12

https://doi.org/10.5194/cp-21-2579-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/cp-21-2579-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 12

Research article

|

12 Dec 2025

Research article |

| 12 Dec 2025

Delivery of aged terrestrial organic matter to the Laptev Sea during the last deglaciation

Arnaud Nicolas, Jens Hefter, Hendrik Grotheer, Tommaso Tesi, Ruediger Stein, Alessio Nogarotto, Eduardo Queiroz Alves, and Gesine Mollenhauer

Supplement

https://doi.org/10.5194/cp-21-2579-2025-supplement

Data sets

Foraminifera radiocarbon ages, bulk organic carbon and compound specific radiocarbon analysis F14C data, biomarkers and δ13C data from core PS2458-4, Laptev Sea, Arctic Ocean Arnaud Nicolas et al. https://doi.org/10.1594/PANGAEA.986657

Short summary

We analyzed a high-resolution marine sediment record from the Laptev Sea to reconstruct deglacial permafrost thaw events during the last 16 kyr. Using biomarkers and radiocarbon dating, we found that peaks in pre-aged terrigenous material coincided with rapid sea-level rise, indicating coastal erosion as the main mobilization mechanism. This research provides insights into past permafrost carbon release, informing predictions of future climate-permafrost feedback in a warming world.