Abstract
Here we present lithological and geochemical characteristics of the core drilled in coastal part of the Laptev Sea (Ivashkina Lagoon, Bykovsky Peninsula). It is shown that for sediments accumulated in specific lagoon conditions the increased content of organic carbon is confined to fine-grained lacustrine and lagoonal sediments in the uppermost layers. Pyrolytic analysis results indicate a sharp variability in the content of total organic carbon and volatile organic compounds across the studied horizons. The distribution of n-alkanes is characterized by the dominance of high molecular weight homologues, which indicates the ubiquitous contribution of higher terrestrial vegetation discharged with river and coastal thermo abrasion fluxes to the organic matter of bottom sediments.
Highlights
The interactions between climate and carbon cycle in the Arctic region are undergoing substantial changes due to destabilization of vulnerable permafrost carbon pool followed by massive thaw-release of organic carbon
In present study we investigate bottom sediments accumulated in the specific lagoon conditions of the coastal part of the Laptev Sea (Ivashkina Lagoon, Bykovsky Peninsula).A core was collected from the well drilled in the central part of the Ivashkina lagoon (VD-13) as part of the 2013 spring research expedition
Ivashkina lagoon is a former thermokarst lake transformed into a lagoon through the thermo abrasion of the runoff channel during marine transgression in Early Holocene[4]
Summary
The interactions between climate and carbon cycle in the Arctic region are undergoing substantial changes due to destabilization of vulnerable permafrost carbon pool followed by massive thaw-release of organic carbon. This process triggers many complex biogeochemical mechanisms including intensive mobilization and increasing supply of terrigenous organic carbon to the coastal ocean, which have been the subject of growing scientific interest in recent years [1,2]. Organic matter (OM) contained in bottom sediments on the continental shelf accumulates heterogeneous signals of various processes of carbon transport and transformation and acts as a unique indicator of its sources. We focus on the uppermost layers, using grain-size, pyrolytic and GC-MS analyses
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