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Lecture

GEOGldjgliasr.pdf

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Department
Geography
Course
GEOG 1120
Professor
Tang
Semester
Fall

Description
GEOG October 2, 2013 5:57 PM Chapter 6 Atmospheric and Ocean Circulations Atmospheric Pressure BAROMETERS Aneroid barometer(compressesand decompressesbased on the weight of the air, costs about a few grand) 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 measure that. 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 they're going. DRIVING FORCES WITHIN THE ATMOSPHERE - Gravity - Pressure gradient force (PGF) measured upwards from high atmosphericpressure to low Different mediums of atmospheric pressure i
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