Sentences with phrase «seasonal thaw of permafrost»

Polar regions: The seasonal thaw of permafrost will increase by 15 per cent and the overall extent of the permafrost will shrink by about 20 per cent.

Not exact matches

Their findings, published March 9 in Proceedings of the National Academy of Sciences, show that groundwater from the seasonal thawing of the «active layer» of soil above the permafrost adds significantly to the overall concentration of methane in the lake and thus influences the emission of this powerful greenhouse gas to the atmosphere.

active layer the top layer of soil in permafrost that is subjected to seasonal freezing and thawing

They replicated natural seasonal thaws of the upper soils, and the deep and long - term thaw of the permafrost.

When the seasonal freezing is of shorter duration, owing to climate warming, the seasonal thaw runs deeper and extends into the former permafrost, Nelson told LiveScience.

In arctic regions, the acceleration of permafrost thaw and deepening of the seasonal active layer leads to thaw pond formations due to the organic and ice - rich ground subsiding [1]--[2].

To estimate the level of any permafrost feedback, Dean and co-workers must work out how old they expect the carbon exported by natural seasonal permafrost thaw to be.

«The presence of old carbon does not necessarily mean a permafrost feedback is occurring, because old carbon can [still] be released by natural seasonal thaw processes in permafrost systems,» said Joshua Dean of Vrije Universiteit Amsterdam.