GEOG-120 Lecture Notes - Lecture 18: Anemometer, Northern Hemisphere, Ibm 7090
Document Summary
Low pressure at center, pressure gradient is straight inward. L (inner circle- pressure gradient points inward = l) outer circle (counterclockwise) High pressure at center, gradient is straight outward. H (inner circle - pressure gradient points outward = h) outer circle. Atmosphere has weight measured w/barometer (instrument that measures changes in the air pressure and the weather, or that calculates height above sea level) increase in altitude decrease in pressure. Horizontal movement of air across the earth"s surgace. Direction - id"d by the source (easterliers/westery) Velocity - how fast it"s moving (measured w/anemometer) Anemometer - an instrument for measuring the speed of the wind, or of any current of gas. Caused because air tends to move from regions of high pressure those of low pressure. Pressure gradients - gradual changes of atmospheric pressure. Isobars - lines of equal barometric pressure. Uniform air/equal heating over land and water. Uneven heating of the ground warms a column of air above it.
