Lo 9-ss-moistureinatmosph
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Lo 9-ss-moistureinatmosph Lo 9-ss-moistureinatmosph Presentation Transcript

  • Sky and SpaceSky and Space Lecture Outline #3Lecture Outline #3 Moisture in the AtmosphereMoisture in the Atmosphere
  • Moisture in the AtmosphereMoisture in the Atmosphere  HumidityHumidity  CloudsClouds  FogFog  PrecipitationPrecipitation
  • Three Phases of WaterThree Phases of Water
  • HumidityHumidity  How much water vapor is in theHow much water vapor is in the atmosphere?atmosphere?
  • 3 Ways to Express Humidity3 Ways to Express Humidity  Absolute HumidityAbsolute Humidity  Specific HumiditySpecific Humidity  Relative HumidityRelative Humidity  Dew PointDew Point
  • Relative HumidityRelative Humidity  WARM AIR CAN CONTAIN MORE WATERWARM AIR CAN CONTAIN MORE WATER VAPOR THAN COLD AIRVAPOR THAN COLD AIR
  • Changes in HumidityChanges in Humidity
  • Relative Humidity after CoolingRelative Humidity after Cooling
  • 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
  • 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)
  • 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
  • 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
  • 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
  • Cloud FormationCloud Formation
  • Adiabatic CoolingAdiabatic Cooling
  • Rising Parcel cools quicker thanRising Parcel cools quicker than surrounding airsurrounding air
  • Parcel remains warmer than theParcel remains warmer than the surrounding airsurrounding air
  • 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
  • What forces air to rise?What forces air to rise?