2 ATMOSPHERIC GASES 78% Nitrogen 21% Oxygen 1% Trace gases - argon, carbon dioxide, water vapor, etc.
3 LAYERS OF THE ATMOSPHERE (LOWER) Troposphere – lowest layer (0-10 km)Where life exists75% of the atmospheric gasesWeather occurs hereStratosphere – (10-50 km)99% of gases are here and belowPressurized aircraft (jets) above weatherOzone layer
4 LAYERS OF THE ATMOSPHERE (UPPER) Mesosphere (50-80 km)Temperature reaches the lowest point-90o C = -130o FThermosphere –2 partsIonosphere ( km)Contains ions which are electrically charged particlesIons reflect radio waves back to earthIons interact with air to cause auroras
5 Exosphere (550 – km)Hottest layer in the atmosphere ( o C)
6 ATMOSHPERIC TEMPERATURE Changes as you move through the atmosphereHeated by absorbing energy from the sunDifferent gases absorb different amounts of energy
7 ATMOSPHERIC PRESSURE Sea level has the greatest amount of pressure. Density is greater at the bottom of the atmosphereDensity decreases as you rise through the atmosphereThe greater the density, the greater the pressure