Meteorology for Air Pollution Control Engineers19

Meteorology for Air Pollution Control Engineers19 - are...

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1 n As it flow in, conservation of angular momentum requires  its velocity to increase to make up for the decreased radius  of the column. n The rotational  speed is small far from the center, but  quite large at the center.
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2 n If the ground is dry, the high-velocity wind at the center  will pick up dust and carry it up, forming a visible dust  devil. n The rotation also stabilizes the upward flow, holding it  together better than it would if it were not rotating.
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3 n The tornadoes (also called cyclones, or twisters) that  regularly cause fatalities, injuries, and property damage 
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Unformatted text preview: are described equally well by Fig. 5.8, except that their scale is much larger. n To create a strongly unstable atmosphere over a large area one cannot simply rely on the sun shining on the ground. 4 n Instead, one must have bulk air movement in which a fast-moving cold air mass rides over a moist, warm air mass 2 to 3 km thick. n As a result the lapse rate at the boundary between the two air masses is much larger than the adiabatic lapse rate, leading to the very strong upward-moving columns of air called tornadoes....
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This note was uploaded on 10/14/2011 for the course CIVL CIVL345 taught by Professor Hsinchu during the Spring '11 term at SUNY College of Environmental Science and Forestry.

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Meteorology for Air Pollution Control Engineers19 - are...

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