Sentences with phrase «term thaw of the permafrost»

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

Not exact matches

To test these hypotheses, we combined long - term incubation studies (> 7 yrs) of permafrost samples with numerical modelling and simulated both oxic and anoxic GHG production from thawing permafrost until 2100.

Ultimately, the long - term fate of carbon release from thawing permafrost may be counterbalanced by enhanced vegetation growth.

By using dual radioactive tracers with differing lifetimes, Wilson et al. [2017] found short term increases in CH4 and CO2 release during periods of thaw in a discontinuous permafrost were generally offset by long - term accumulation of peat in the ensuing millennia, leading the regions to continue to be net carbon sinks with negative atmospheric radiative forcing, given the long life - time of atmospheric CO2.

They have, for what they say is the first time, measured in the laboratory the long - term production of methane in thawing permafrost.

Thawing permafrost is also expected to alter area landscapes and make local ecosystems more susceptible to long - term damage, in part because permafrost degradation can lead to significant changes in local soil temperatures and moisture levels.14, 20,21 Soils on or near the banks of thermokarst ponds tend to be much drier than those on level tundra, owing to higher soil temperatures and drainage.14, 20,21 On the Seward Peninsula, the banks of these ponds host trees (usually spruces) and shrubs that are otherwise usually absent in the characteristically treeless tundra.14, 21