Lecture7_GEOG1400

This temperature is referred to as the dewdew point

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Unformatted text preview: his temperature is referred to as the DewDew-point temperature Dingman, 2002 Specific Humidity Specific Humidity Specific Humidity - determines the actual quantity of water vapour held by the air. This quantity is stated as the mass of water vapour contained in given mass of air and is contained in a given mass of air and is expressed expressed as grams of water vapour per kilogram of air (g/kg). (g Term Term often used to describe large air masses: Arctic air mass: Arctic air mass: 0.2 g/kg vs. Tropical air mass: g/kg vs Tropical air mass: 18 18 g/kg. The Adiabatic Process The Adiabatic Process How is water vapour turned into How is water vapour turned into precipitation: precipitation: COOLING OF THE AIR! COOLING OF THE AIR! Mechanisms: Mechanisms: nighttime coolingnighttime cooling-dew, frost but precipitation is only formed when but precipitation is only formed when a substantial substantial mass of air experiences cooling need need AIR MASS to be UPLIFTED MASS to be UPLIFTED Dry Adiabatic Rate Dry Adiabatic Rate When gas expands, it cools; when When gas is compressed, it warms Adiabatic Adiabatic process: heating or cooling due to pressure changes. coolin...
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