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Meteorology The Atmosphere

Meteorology The Atmosphere

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Meteorology The Atmosphere

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  1. MeteorologyThe Atmosphere

  2. Reference From the Ground Up Chapter 6.1: The Atmosphere Pages 123 - 124

  3. Introduction • Meteorology is the study of the Earth’s atmosphere and the weather which occurs in it. • It’s important for pilots to know about the weather since aircraft are much more dependent on it than ground-based vehicles.

  4. Outline • Properties • Divisions • Standard Atmosphere

  5. Properties • Composition: • 78% nitrogen • 21% oxygen • 1% other = Argon, carbon dioxide, water vapour, etc • Water vapour is most important component in terms of weather • Properties of atmosphere (cause most weather): • Mobility • Compression • Expansion (most important)

  6. N EQUATOR S Troposphere Stratosphere Mesosphere Thermosphere

  7. Divisions • Troposphere • Temperature and pressure decrease • Where most weather occurs • Almost twice as wide at equator than poles • Top layer is Tropopause • Stratosphere • Temperature increases to 0°C due to Ozone Layer • Almost no water vapour or air currents • Top layer is Stratopause

  8. Divisions • Mesosphere • Temperature decreases to -100°C • Top Layer is Mesopause • Thermosphere • Temperature increases indefinitely • Includes Ionosphere, which reflects certain radio signals • Exosphere • Pressure drops to vacuum • Auroras form • Merges into Space

  9. Standard Atmosphere • ICAO standard atmosphere • Air is perfectly dry gas • MSL pressure= 29.92” Hg= 1013.2 hPa= 1013.2 mb= 101.3 kPa • MSL temperature = 15°C • Lapse rate = 1.98°C per 1000 ft

  10. Next Lesson 4.2 – Meteorology Clouds From the Ground Up Chapter 6.2: Clouds Pages 124 - 127