PHYS 1305 Lecture Notes - Lecture 5: Thermosphere, Exosphere, Tropopause
10 Sep 2016
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Document Summary
How planet (satellite) obtain atm? o o o o. How planet (satellite) keep atm? o o o. Atm escape depends on gravity and other parameters. Earth"s size makes atm not too thick or thin. Venus has thicker atm than earth due to greenhouse effect. Vertical structure of atm o o o o o o. T increase about 2k per km (ozone absorption) Tropopause between troposphere and stratosphere as effective barrier. T decrease about 3k per km (coldest layer) Fundamental quantity to understand weather, radiation, and chemistry of atm. Pushing force over surface (depends density and t) Earth"s surface pressure is 1 bar (1000 mbar) 1 mbar= 100 pascal (1 pascal= 1 newton over 1 m2) Driving f behind wind (atm motion) and weather o o o o. P gradient: air flows from increase to decreasing pressure (downhill) Coriolis: caused by rotation of earth, wind deflects to right in n hemisphere. Lightning when particles with different charges strongly interact.
