Chapter 5 - Cool air- High atmospheric pressure Dynamic...

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Atmospheric Pressure and Wind 19:15 The Impact of Pressure and Wind on the Landscape Wind has energy to transport solid particles in the air and thus has a visible component  to its activity Pressure and wind are major elements of weather and climate The Nature of Atmospheric Pressure Atmosphere is made up of gas Atmospheric pressure The force excreted by the gas molecules on some area of  Earth’s surface or on any other body Factors Influencing Atmospheric Pressure Ideal gas law- The pressure of gas is proportional to its density and temperature Density and Pressure Density- The mass of matter in a unit volume Density of a solid material does not vary, but density of a gas material greatly varies  from place to place The denser the gas, the greater the pressure it exerts Atmosphere is held to Earth by gravity Temperature and Pressure Warm air- Low atmospheric pressure
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Unformatted text preview: Cool air- High atmospheric pressure Dynamic Influences on Air Pressure Dynamic high- Strongly descending air is usually associated with high pressure at the surface Thermal high- Very cold surface conditions are often associated with high pressure at the surface Dynamic low- Very warm surface conditions are often associated with relatively low pressure at the surface Mapping Pressure with Isobars Barometers- Atmospheric pressure is measured with instruments Millibar- One of the most common units of measure for atmospheric pressure Isobars- Isolines of equal pressure Ridge- An elongated area of relatively high pressure Trough- An elongated area of relatively low pressure Pressure gradient- The relative closeness of isobars indicates the horizontal rate of pressure change Wind- Horizontal air movement 19:15 19:15...
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This note was uploaded on 03/05/2012 for the course GEOGRAPHY 450:101 taught by Professor Eleswarapu during the Spring '12 term at Rutgers.

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Chapter 5 - Cool air- High atmospheric pressure Dynamic...

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