Lecture_12_Origin_Atm

Lecture_12_Origin_Atm - Origin of Ocean and Atmosphere Big...

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1 1 Origin of Ocean and Atmosphere • Big 2 in Universe H,He • Big 4 on Earth: O, Mg, Si, Fe • Big 6 in Life: C, H, O, N, P, S H 2 O - liquid water is a good solvent - enables elements to move around and form complex molecules Water is liquid over a wide range of temperature C - can form many types of strong bonds. Good for building complex molecules 2 • P - captured during planet formation • S,O - partially captured • C,H,N - largely lost as volatiles (gas) 1.00E+00 1.00E+01 1.00E+02 1.00E+03 1.00E+04 1.00E+05 1.00E+06 1.00E+07 1.00E+08 1.00E+09 1.00E+10 1.00E+11 1.00E+12 0 20 40 60 80 Log relative abundance Atomic number H C N O P S
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2 3 4 Ocean = water + ….
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3 5 Important Concept: Escape Velocity is … … the velocity a body must be given in order to escape the gravitational hold of some other larger body, e.g., the earth, moon, or sun. A body given less than the escape velocity will fall back toward the surface of the larger body; a body given a velocity equal to or greater than the escape velocity will still be attracted by the larger body, but this force will not be sufficient to cause it to return. Escape velocity depends on the mass of the larger body and the distance of the smaller body from its center, being proportional to the square root of the ratio of these two quantities. So if Ω = v esc /v Then 6 Escape Velocity (Cont’d)
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4 7 Mars was warmer early in its history. The escape velocity from its surface was 1. Lower than today 2. Higher than today 3. The same as today 8 For a one component gas: B. Temperature and Molecular Motion
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This note was uploaded on 02/08/2011 for the course EAS 1601 taught by Professor Lynch during the Spring '08 term at Georgia Tech.

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Lecture_12_Origin_Atm - Origin of Ocean and Atmosphere Big...

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