Differential input and preservation of different terrestrial carbon pools across the East Siberian Arctic Shelf
High-latitude permafrost soils store huge amounts of organic carbon, roughly twice as much as what is currently in the atmosphere. The Arctic as a whole is also subject to particularly pronounced warming, which leads to substantial permafrost thawing and thereby remobilization of previously freeze-locked carbon pools. The arctic shelf seas receive land-derived organic carbon through riverine transport and coastal erosion. The fate of this material in the marine environment is still insufficiently understood, even though its possible degradation would cause the release of greenhouse gases CO2 and methane to the atmosphere and thus provide a potential positive feedback mechanism to ongoing global warming.
In my PhD project I apply advanced molecular and isotopic methods, such as various terrestrial biomarkers and compound-specific radiocarbon analysis to gain further insights into the transport and degradation processes of the different terrestrial carbon pools on the East Siberian Arctic Shelf. In summer 2014 I was part of the first leg of the Swedish-Russian-US Investigation of Carbon-Climate-Cryosphere Interactions in the East Siberian Arctic Ocean (SWERUS C-3), a 45-day expedition with icebreaker Oden through the East Siberian Sea. We collected a multitude of sediment, water and atmospheric samples, some of which will be analyzed in the course of my PhD work.
Latest scientific papers
Quantifying degradative loss of terrigenous organic carbon in surface sediments across the Laptev and East Siberian Sea
Remobilization of old permafrost carbon to Chukchi Sea sediments during the end of the last deglaciation
Sources and characteristics of terrestrial carbon in Holocene-scale sediments of the East Siberian Sea
Distinguishing between old and modern permafrost sources in the northeast Siberian land–shelf system with compound-specific δ2H analysis