19.%20Weather_06

19.%20Weather_06 - Introduction to Environmental Science...

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03. Atmosphere 1 Introduction to Environmental Science 12:008/159:008 Spring 2002 Atmosphere and Weather Climate vs. Weather •Wea ther The physical condition of the atmosphere (moisture, temperature, pressure, wind) • Climate Long term pattern of the weather in a particular area Why does the wind blow? • Air moves from high to low pressure. • Differential pressures caused by differential heating. – Small scale = lake effect – Larger scale = sea breeze – Global scale = wind belts Which is heavier: hot air or cold air? • As air is heated, it expands and becomes less dense –Hot air is lighter than cold air • Being less dense it will want to rise Which is heavier: moist air or dry air? • Most of the atmosphere is made of: –O 2 (32 amu) –N 2 (28 amu) –CO 2 (44 amu) • Water molecules displace air –H 2
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03. Atmosphere 2 Introduction to Environmental Science 12:008/159:008 Spring 2002 20° 17° 13° 10° Air packet holding 7.5g water/Kg of air (Specific humidity) Can hold 15 g Can hold 12 g Can hold 9 g Can hold 7.5 g RH=50% RH=62.5% RH=83% RH=100% Cold air can’t hold as much water as warm air. Dew Point is 10°C
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19.%20Weather_06 - Introduction to Environmental Science...

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