GEG 2304 Lecture Notes - Lecture 3: Polar Regions Of Earth, Black Body, Arctic Circle
7 Feb 2018
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=inputs(volcanic outgassing)-loses(losses determine by proportion of molecules reaching ) Escape velocity = f(gravity) but depends on planet size. Escape velocity is a function of gravity alone. Mean velocity depends on the temperature and type of molecules, higher the temp the faster the molecules and the more that reach the escape velocity and then get lost. Present day composition of the atmosphere n2, o2, c02/h20. 1-because as the plant was forming the heavier items moving to the center, h and he were the lightest and then were lost over time. 2-crust of earth is starting to form and volcanoes are starting to from, this suggests that the second atmosphere as the h and he is being lost a new atmosphere is being formed creating a very moist atmosphere. 3-oceaans start forming and water from the atmosphere in (2) is brought down to form the ocean. Which gives us the third atmosphere giving us co2 as the most abundant in the atmosphere.
