Relict thermokarst carbon source kept stable within gas hydrate stability zone of the South Kara Sea

Alexey Portnov1,2, Jurgen Mienert1, Monica Winsborrow3, Sunil Vadakkepuliyambatta1 and Peter Semenov4, (1)UiT The Arctic University of Norway, CAGE-Centre for Arctic Gas Hydrate, Environment, and Climate, Dept. of Geoscience, Tromso, Norway, (2)The Ohio State University, School of Earth Sciences, Columbus, OH, United States, (3)CAGE - Centre for Arctic Gas Hydrate, Environment and Climate, UiT The Arctic University of Norway, Department of Geoscience, Tromsø, Norway, (4)VNIIOkeangeologia, Saint-Petersburg, Russia