Submitted by Anonymous on Sat, 08/31/2013 - 15:32

In your July 6th journal entry you talk about an important discovery. (If I understand correctly) due to thermokarst activity and general melting new layers of permafrost are being exposed to the sun. Because these layers have not been exposed before they melt at a 40% faster rate. Doesn't this relate to the plants that live on the “active layer” of the permafrost? The plants help absorb the light from the sun, the problem is the general heat which is causing thermokarst activity which removes the sheltering layer of plants. Plants roots systems are good at stopping landslide and movement of loose dirt. Could the loss of permafrost be slowed by replanting plants in areas effected by thermokarst activity? Also is the 40% increase rate related to the fact that there are no plants on the layer? Finally, could a more robust, bigger plant (bigger root system) be put in an effected area to reduce soil movement and absorb the carbon dioxide released? That would only work in the summer though, when the plants are able to grow. But that is also the hottest part of the year when I assume most of the melting is taking place.

I know that was a dense question and you do not have to answer it all now, but we can talk about it in school.

Thanks, Jack Doyle

Anonymous

Jack -
Good, inquisitive thinking here, as usual. The main cause of thermokarst is that the ice that's bound up in the permafrost melts, which leaves water and loose mud in place where there used to be frozen soil and ice. So, just from a physical situation, the thawed permafrost can't hold itself together and falls apart. That's a thermokarst. Plant roots certainly help to hold it in place, but if the ground is really thawing they can't do the job alone. The 40% increased rate refers to microbial respiration of carbon from thawed permafrost - when carbon in thawed permafrost is exposed to the sun, it's 40% easier for the microbes to "eat" it and convert it to CO2.
Replanting the tundra could conceivably help reduce thermokarst, but it's probably not practical. Even walking on the tundra is hard to do, and to get people and plants and equipment up there, even if we knew how to do it, would cost a fortune. Keep coming up with the ideas, though. We're going to have to think hard to solve this problem.
-Mr. T