October 2, 2013 5:57 PM
Atmospheric and Ocean Circulations
Aneroid barometer(compressesand decompressesbased on the weight of the air, costs about a
Mercury barometer(designed by Italian scientist)
Mercury is 13x denser than water.
Normal sea level pressure
- 760 mm (or 29.92 in) mercury
- 1013.2mb (millibars)
- 101.32 kPa (kiloPascals)
Air Pressure Scales are taken in millibars and half of it is in the normal range. Cold air sinks to the
ground because it is heavier than heat.
Wind Vane and Anemometer
Higher atmosphericpressure: moreamount of concentratedair
Lower atmosphericpressure: less amount of concentratedair
Wind creates a balance to give an equal, balanced amount of air concentration.Wind vanes
Anemometergives a measure of velocityof wind.
In wind measurement,you must always determine direction and velocity.
Wind measurementin an anemometeris always about where they're coming from, not where
DRIVING FORCES WITHIN THE ATMOSPHERE
- Pressure gradient force (PGF) measured upwards from high atmosphericpressure to low
Different mediums of atmospheric pressure i