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Yedoma sífreri

Yedoma er sífreri sem er mjög ríkur af lífrænum efnum (kolefnisríkur) og hefur verið frosinn síðan á Pleistósen tímabilinu eða fyrir um 2,6 milljónum ára. Yedoma hefur allt frá 50 til 90% ísinnihald.

Sífrerinn yedoma nær yfir um eina milljón ferkílómetra meðfram 7000 km strandlengju í Austur Síberíu.

Sífrerinn er tekinn að þiðna og hefur þegar orðið vart við metangasleka sem að stuðlar að hörfun strandlengjunnar í Síberíu og Alaska.

Mynd: útbreiðsla yedoma http://apgc.awi.de (Creative Commons Attribution 4.0 License).


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