Pore water chemistry, grain sizes and sediment temperature of 4 sediment cores from submarine permafrost at Mamontov Klyk Cape, Laptev Sea shelf ...

The mobilization of carbon in degrading permafrost is a long-term process and an important feedback upon climate change. Under submarine conditions substantial permafrost warming occurs millennia before permafrost thaws, potentially stimulating microbial communities. How microbial community composit...

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Bibliographic Details
Main Authors: Mitzscherling, Julia, Horn, Fabian, Winterfeld, Maria, Mahler, Linda, Kallmeyer, Jens, Overduin, Pier Paul, Winkel, Matthias, Grigoriev, Mikhail N, Wagner, Dirk, Liebner, Susanne
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2018
Subjects:
Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn
Arctic
Laptev Sea
Climate change
Ice
laptev
permafrost
Online Access:https://dx.doi.org/10.1594/pangaea.895292
https://doi.pangaea.de/10.1594/PANGAEA.895292
Description
Summary:The mobilization of carbon in degrading permafrost is a long-term process and an important feedback upon climate change. Under submarine conditions substantial permafrost warming occurs millennia before permafrost thaws, potentially stimulating microbial communities. How microbial community composition and abundance responded to millennial-scale permafrost warming remains, however, unkown.We measured the in situ development of bacterial community composition and abundance together with temperature, salinity and pore water chemistry along an onshore-offshore transect on the Siberian Arctic Shelf. Samples derived from ice-bonded terrestrial permafrost comparable in age and sedimentation history that had been warming by more than 10 °C over the last 2500 years.Bacterial assemblages identified through amplicon sequencing correlated only weakly with temperature but strongly with pore water stable isotope signatures. They showed a significant spatial variation. Bacterial 16S rRNA gene copies quantified through ... : Supplement to: Mitzscherling, Julia; Horn, Fabian; Winterfeld, Maria; Mahler, Linda; Kallmeyer, Jens; Overduin, Pier Paul; Schirrmeister, Lutz; Winkel, Matthias; Grigoriev, Mikhail N; Wagner, Dirk; Liebner, Susanne (2019): Microbial community composition and abundance after millennia of submarine permafrost warming. Biogeosciences, 16(19), 3941-3958 ...

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