Variations in Atmospheric Pressure

Variations in Atmospheric Pressure - Local Wind Patterns...

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Variations in Atmospheric Pressure Cells of High and Low Pressure Low (Cyclone) = L Air is ascending (rising) Low pressure Convergence at surface High (anticyclone) = H Air is descending (subsidence) High pressure Divergence at surface Horizontal Differences in Pressure Pressure does not increase in a regular pattern from the equator to the poles There are regions of high pressure and low pressure in the subpolar regions and subtropics This is related to atmospheric circulation Air rises at the equator and encounters the tropopause and splits into two air currents flowing in opposite directions (north and south). Air piles up aloft from middle latitudes and will descent, producing high pressure in the subtropical regions. Collision of air @ 60 degrees causes air to rise.
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Unformatted text preview: Local Wind Patterns Wind is defined as air moving horizontally over the Earths surface. Winds are identified by the direction from which the wind comes a west wind blows from west to east. Pressure Gradients Wind is caused by differences in atmospheric pressure from one place to another Air tends to move from regions of high pressure to regions of low pressure Isobars: lines on a map drawn through all points having the same atmospheric pressure Pressure gradient: change of atmospheric pressure measured along a line at right angles to the isobars The Coriolis Effect and Wind Coriolis Effect Apparent deflection of the wind N. hem: wind is deflected to the right S. hem: wind is deflected to the left....
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Variations in Atmospheric Pressure - Local Wind Patterns...

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