Lo 9-ss-moistureinatmosph

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Lo 9-ss-moistureinatmosph

  1. 1. Sky and SpaceSky and Space Lecture Outline #3Lecture Outline #3 Moisture in the AtmosphereMoisture in the Atmosphere
  2. 2. Moisture in the AtmosphereMoisture in the Atmosphere  HumidityHumidity  CloudsClouds  FogFog  PrecipitationPrecipitation
  3. 3. Three Phases of WaterThree Phases of Water
  4. 4. HumidityHumidity  How much water vapor is in theHow much water vapor is in the atmosphere?atmosphere?
  5. 5. 3 Ways to Express Humidity3 Ways to Express Humidity  Absolute HumidityAbsolute Humidity  Specific HumiditySpecific Humidity  Relative HumidityRelative Humidity  Dew PointDew Point
  6. 6. Relative HumidityRelative Humidity  WARM AIR CAN CONTAIN MORE WATERWARM AIR CAN CONTAIN MORE WATER VAPOR THAN COLD AIRVAPOR THAN COLD AIR
  7. 7. Changes in HumidityChanges in Humidity
  8. 8. Relative Humidity after CoolingRelative Humidity after Cooling
  9. 9. Relative Humidity and TemperatureRelative Humidity and Temperature  Warm Air is Capable of Holding More Water Vapor than ColdWarm Air is Capable of Holding More Water Vapor than Cold AirAir
  10. 10. Dew PointDew Point  When air is cooled, it can reach 100%When air is cooled, it can reach 100% Relative Humidity (saturation)Relative Humidity (saturation)
  11. 11. Dew PointDew Point  When air is cooled to a certain temperature,When air is cooled to a certain temperature, it can reach 100% Relative Humidityit can reach 100% Relative Humidity (saturation)(saturation)  Condensation Occurs at thisCondensation Occurs at this temperaturetemperature
  12. 12. Dew PointDew Point  When air is cooled to a certain temperature,When air is cooled to a certain temperature, it can reach 100% Relative Humidityit can reach 100% Relative Humidity (saturation)(saturation)  Condensation Occurs at this temperatureCondensation Occurs at this temperature  This is the Dew PointThis is the Dew Point TemperatureTemperature
  13. 13. Basics of Cloud FormationBasics of Cloud Formation  Warm air contains more water vapor thanWarm air contains more water vapor than cold aircold air  Hot fluids rise (convection)Hot fluids rise (convection)  In the troposphere, temperature decreasesIn the troposphere, temperature decreases with altitudewith altitude  When water vapor in the air cools, itWhen water vapor in the air cools, it condensescondenses
  14. 14. Cloud FormationCloud Formation
  15. 15. Adiabatic CoolingAdiabatic Cooling
  16. 16. Rising Parcel cools quicker thanRising Parcel cools quicker than surrounding airsurrounding air
  17. 17. Parcel remains warmer than theParcel remains warmer than the surrounding airsurrounding air
  18. 18. Conditional InstabilityConditional Instability  Rising parcel coolsRising parcel cools quicker thanquicker than surrounding airsurrounding air  Reaches dew pointReaches dew point  Then cools slowerThen cools slower than surroundingthan surrounding airair
  19. 19. What forces air to rise?What forces air to rise?

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