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Changes to Air Parcels

Changes to Air Parcels. Precipitation Presentation. Definitions. Lifting condensation level: the altitude where the parcel of air has reached saturation and cloud formation begins Adiabatic: a process where the parcel temperature changes due to an expansion or compression.

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Changes to Air Parcels

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  1. Changes to Air Parcels Precipitation Presentation

  2. Definitions • Lifting condensation level: the altitude where the parcel of air has reached saturation and cloud formation begins • Adiabatic: a process where the parcel temperature changes due to an expansion or compression

  3. Environmental lapse rate • The environmental lapse rate is the actual decrease in temperature with an increase in altitude through the troposphere.

  4. Dry adiabatic lapse rate • The rate of expansion cooling for dry air is very close to 10_C/km • dry adiabatic lapse rate (DALR).

  5. Wet adiabatic lapse rate • moist adiabatic lapse rate (MALR) • increasing altitude = 0.6C per 100 meters • greater the amount of vapour = smaller the adiabatic lapse rate.

  6. Dew Point Temperature • The dew point is a measure of the humidity content in the air. • The temperature at which condensation starts occurring is what we call the dew point. • The temperature the dew point is in direct relation to the humidity

  7. Sources • http://www.atmos.ucla.edu/~fovell/AS3downloads/lapse_rates.pdf • http://www.weatheroffice.gc.ca/mainmenu/faq_e.html#weather3

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