Fritz, Michael

Irrgang, Anna

Knoblauch, Christian

Lantuit, Hugues

Radosavljevic, Boris

Ramage, Justine

Ruttor, Saskia

Strauss, Jens

Tanski, George

Wolter, Juliane

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 Carbon and nitrogen mobilization along  thermokarst-affected permafrost coasts and its degradation mechanisms before entering the near shore zone a George Tanski, Hugues Lantuit, Saskia Ruttor, Christian Knoblauch, Boris Radosavljevic, Jens Strauss, Juliane Wolter, Anna Maria Irrgang, Justine Ramage, and Michael Fritz     34% of global coasts  400,000km coastline  1/3 unlithified cliffs  18% ground ice   0.6m yr-1 erosion Lantuit et al. 2012 I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion Tarnocai et al. 2009 *SOC content in 0–3 m of soils: 1035 ±150 Pg (Hugelius et al. 2014)  66 Pg nitrogen (N) in the uppermost 3 m (Harden et al. 2012)  Gt Corg.  Global carbon storage in soils * I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion  • Quantify and compare terrestrial OM contents • Assess transformation processes after affected by thermokarst • Track fate of terrestrial OM in the nearshore zone I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion  Ground ice  37%  Coastal erosion 0.7m yr-1 Cont. permafrost ~600m depth I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion    I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion Undisturbed (Active layer, Permafrost) Disturbed (Mudpool, Transition zone, Slump floor, Thaw stream) Nearshore (Marine sediments) TOC TN δ13C-TOC DOC DN/DIN δ13C-DOC Bio- marker Ice volumes C/N δ13C NH4-N I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion Height  0.4m  2.5m  14.0m Vol.  3%  14%  83% DOC conc.  65.9 mg L-1  66.8 mg L-1  2.9 mg L-1  13.9 mg L-1 26.5 mg L-1   I  II  III I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion C/N I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion NH4-N I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion Bio- marker I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion TN I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion  OM contents decrese substantially due to thermokarst formation before entering the nearshore zone  Dilution, mineralzation, direct transport, and plant uptake as main transformation mechanisms  OM directly buried in nearshore sediments, esp. heavier fractions  OM characteristics are drastically changed due to theromkarst  Thermokarst along ice-rich coasts with strong impact on the coastal environment  What happens with permafrost carbon after transport into the ocean?  What are possible impacts on marine ecosystem in the nearshore? How is OC incorporated into local food webs? I. Introduction II. Study area III. Methods IV. Results V. Discussion VI. Conclusion Acknowledgement Thank you very much for the attention! www.awi.de/forschung/nachwuchsgruppen/coper  Arctic coastal erosion group 

Carbon and nitrogen mobilization along thermokarst-affected permafrost coasts and its degradation mechanisms before entering the near shore zone

Carbon and nitrogen mobilization along thermokarst-affected permafrost coasts and its degradation mechanisms before entering the near shore zone

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