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UTD - GEOS 2302 - Class Notes - Week 3

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UTD - GEOS 2302 - Class Notes - Week 3

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background image Week Three Notes 01/23/2018  Structure of the Atmosphere  ● Atmosphere  ○ Mixture of gases, liquids, solids held close to surface b/c of gravity 
○ Extends outward  10K km
  ■ 50% concentrated w/in  6K m   ■ 98% w/in 26 km   ● Composition of atmosphere  ○ Permanent: Very little influence on weather/climate  ■ N (78%), O (21%), Ar (1%)  ○ Variable: Influence weather/climate  ■ Water vapor, CO 2 , O ○ Particulates (Aerosols)  ● Layers of atmosphere (from lowest to highest)  ○ Troposphere  ■ Overturns air 
■ Temp decreases w/height 
○ Tropopause  ■ Transition zone between tropo and strato  ○ Stratosphere  ■ Temp increases w/height 
■ Considered stagnant 
○ Stratopause  ■ Top of strato (48 km, or 30 mi) 
■ Max temp reached 
○ Mesosphere  ■ Temp decreases w/height  ○ Mesopause  ■ Transition zone between meso and thermo  ○ Thermosphere  ■ Highest recognized  thermal  layer  ■ Temp stays constant at first, then increases w/height  ○ Exosphere  ● Homosphere  ○ Tropo and stratosphere  ● Heterosphere  ○ Mesosphere and upwards  ● Ozonosphere  ○ Ozone layer  ● Ionosphere  ○ Deep layer of ions in meso and thermosphere   
background image   01/25/2018  Earth’s Motion Relative to the Sun (Earth-Sun Relations)  ● Critical Earth movements:  ○ Daily rotation on axis 
○ Annual revolution around Sun 
● Rotation  ○ Spins towards east 
○ Constant 
○ Coriolis Effect 
■ Deflection in flow of air/water (deflects to right in Northern hemisphere, left in Southern)  ○ Diurnal (daily) alternation of light/darkness  ● Revolution  ○ Tropical year: One revolution around Sun (365.25 days) 
○ On elliptical path 
■ Affects  climate​, not temperature  ○ Perihelion  ■ Point nearest to Sun 
■ For Earth, on Jan. 3 
○ Aphelion  ■ Point farthest from Sun 
■ For Earth, on July 4 
● Inclination of Earth’s axis  ○ 23.5° off perpendicular  ● Angle of incidence  ○ Angle at which Sun’s rays hit different parts of Earth  ● Effects of Earth’s movement:  ○ Quality of sunlight  ■ Variations in sun angle 
■ Beam spreading 
■ Direct vs diffuse radiation 
■ Insolation 
○ Quantity “...”  ■ Day length variation 
■ No energy from sun at night 
■ Longer days = More solar energy 
● Summer (June) Solstice  ○ June 21 st  ○ Direct rays at Tropic of  Cancer​ (23.5°N)  ○ Arctic Circle (66.5°N)  ■ Experiences 24 hrs of  light  ○ Antarctic Circle (66.5°S)  ■ Experiences 24 hrs of  darkness 

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School: University of Texas at Dallas
Department: Geoscience
Course: The Global Environment
Professor: Anthony Cummings
Term: Spring 2018
Tags: Atmosphere, Earth Science, EarthRotation, sun, and Earth and Sun Relationship
Name: Atmosphere & Earth's Movement - Week Three Notes - GEOS 2302
Description: 01/22 - 01/26/2018 These notes cover the Earth's atmosphere and the movement of the Earth (rotation, revolution, and axis tilt)
Uploaded: 01/25/2018
3 Pages 20 Views 16 Unlocks
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