A&O 2 - Lecture 2.2

A&O 2 - Lecture 2.2 - Neon 18.18 ppmv Helium 5.24...

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1 The Earth’s Atmosphere • Atmospheric Structure ! Dimensions ! Vertical Temperature, Pressure, and Density Profile • Atmospheric Composition ! Permanent Gases ! Variable Gases 2 Atmospheric Dimensions Depth: ~ 100–500 km Horizontal scale: ~ 40,000 km 3 Vertical Temperature Profile 10 0 50 85 km Troposphere Stratosphere Mesosphere Thermosphere Alt. Temperature 4 Atmospheric Density Density = Mass / Volume ! = M V z compress
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5 Atmospheric Pressure Pressure = Force / Area F A Earth’s surface Atmos. 6 z P M M M M M M M M M 7 Atmospheric Composition Nitrogen (N 2 ) 78.08% Oxygen (O 2 ) 20.95% Argon (Ar) 0.93%) Permanent Gases
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Unformatted text preview: Neon 18.18 ppmv Helium 5.24 ppmv Krypton 1.14 ppmv Xenon 0.087 ppmv Trace Gases 8 Variable Gases Water Vapor (H 2 O) Typical M.R. 1~4% Temperature-dependent Carbon Dioxide (CO 2 ) Current M.R. ~370 ppmv 6 ppmv Seasonal variation Both absorb infrared radiation 9 Variable Trace Gases Extremely low mixing ratios: ppb, ppt Many are pollutants: ! Carbon monoxide (CO) ! Oxides of nitrogen (NO X ) ! Oxides of sulfur (SO X ) ! Ozone (O 3 ) ! Formaldehyde (HCHO) ! others...
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This note was uploaded on 10/04/2009 for the course A&O A&O 2 taught by Professor Lew during the Spring '09 term at UCLA.

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A&O 2 - Lecture 2.2 - Neon 18.18 ppmv Helium 5.24...

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