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BGSU - GEOG 1250 - Topic 2 Notes - Class Notes

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BGSU - GEOG 1250 - Topic 2 Notes - Class Notes

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background image Topic 2
Atmospheric Composition and Structure
What is the Atmosphere? A mixture of gases, solid, and liquid particles  Significance of Gravity Gravity Earth’s Atmosphere o 5.6 km rule of thumb Reduces by 50% o How “high is the sky?” (the upper limit?) No limit; no define line to where it stops Early Atmospheric Composition Our early atmosphere. 4.5 billion years old Consisted mainly of hydrogen and helium in early stage Formation of our Current Atmosphere Volcanic eruptions o Nitrogen first eruption Photosynthesis  Today’s Atmospheric Composition Permanent Gases o Nitrogen 78% o Oxygen 21% Variable Gases o Some of the variable gases also correspond to Greenhouse Gases o Greenhouse Gases = Water Vapor, Carbon Dioxide, Methane  Water Vapor Variable gas and greenhouse gas 0­4% o EX: close to North Pole ­> more towards 0% o EX: desert ­> more towards 4% Hydrologic Cycle Ongoing process
background image Condensation, Precipitation, Evaporation, Transpiration o Water vapor to liquid = Condensation o Fall out of atmosphere onto ground = Precipitation o Water liquid to vapor = Evaporation o Water released from plant life organisms = Transpiration Carbon Dioxide High concentrations in urban area Methane High concentrations in urban area Ozone Variable gas o Depends on how much sunlight / solar radiation Less sun = less concentration We will not regard this as a greenhouse gas Aerosols Air born solid or liquid Small matter that is in the form of a liquid or solid Vertical Structure Bottom to Top o Troposphere, Stratosphere, Mesosphere, Thermosphere Lapse Rates o  Change in Decrease Temp / Change in Altitude o Do not place a negative value! Inversions o Negative  o EX:  ­10 o  C / 5km = ­2 o  C /km Troposphere Layer of atmosphere that we are exposed to every single day Layer of atmosphere where the atmosphere constantly overturns itself Stratosphere Air is relativity smooth Presence of ozone layer o Important to health because the ozone absorbs some of the higher radiation from  the sun ­> therefore, skin cancer would increase

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School: Bowling Green State University
Department: Geography
Course: Weather and Climate
Professor: Marius Paulikas
Term: Summer 2015
Tags:
Name: Topic 2 Notes
Description: Topic 2 Notes - Jan 15 - Jan 19th WEEK 2
Uploaded: 01/18/2018
3 Pages 23 Views 18 Unlocks
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