Session 19 Terrestrial Carbon Cycle: Soils (cont.)

Question 1

Permafrost

Answer 1

Frozen all year round

Question 2

Active Layer

Answer 2

On top of permafrost that thaws and re-freezes every year

Question 3

Permafrost feedback loop

Answer 3

Global temp increase because of GHGs, active layer thaws, decay is exposed, co2/methane is released, atmospheric co2 levels increase

Question 4

Pulse Disturbances

Answer 4

Permafrost release accelerators

Question 5

Thaw Slumps

Answer 5

Ice in permafrost acting like cement. Warming causes landslides and a release of co2

Question 6

Thermokast lakes

Answer 6

Ice takes up more volume than water causing the land surface to slump and create holes with water. They end up thawing permafrost around them faster. (High with methane)