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Lecture 39

GEOG 1280 Lecture 39: Lecture 39

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GEOG 1280
Bruce G.Erickson

oS82 Humidity Dew Point The temperature at which a given mass of air becomes saturated. In other words, air is saturated when the dewpoint temperature and the air temperature are the same. Extreme dew points: A dew point of 35C was reported in Dhahran, Saudi Arabia at 3 p.m. July 8, 2003. The temperature was 42C, resulting in an apparent temperature or heat index of 80C. StableUnstable Air Points to remember about stability in air: Air always rises or falls at the DALR or SALR (only rises) NEVER at the ELR (environmental lapse rate: actual air temperature as you move through a stationary column of air). Stable air is falling air Unstable air is rising air To test for stability compare moving air to the ELR If moving air is colder than ELR then air will fall o If moving air is warmer than ELR then air will rise Part 4: Atmospheric Circulation and Winds Atmospheric Circulation and Winds Always in motion Striving to remove the imbalance in temperature and pressure Newtons Laws of Motion. o First law: law of inertia, object in motion stays in motion. o Second law: F=ma o Third law: equal reactions Forces Acting on the Air Two opposing forces which act on a vertically moving parcel of air are an upward buoyant force and a downward gravitational force. Pressure Gradient Force (PGF)
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