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Origin of the AtmosphereOrigin of the Atmosphere
Created By:Created By:
Mr. KreegerMr. Kreeger
Homework and Page ReferencesHomework and Page References
Page ReferencesPage References
Pages 477 to 482 of your textbook Pages 477 to 482 of your textbook
HomeworkHomework
Read pages 477 to 482 and do problems Read pages 477 to 482 and do problems 1-6 on page 4831-6 on page 483
****DO NOT FORGET TO COLLECT ****DO NOT FORGET TO COLLECT WEATHER DATA EVERY DAY***WEATHER DATA EVERY DAY***
Table of ContentsTable of Contents
1.1. Origin of the AtmosphereOrigin of the Atmospherea.a. Earth’s lost atmosphereEarth’s lost atmosphereb.b. OutgassingOutgassingc.c. Comet’s impactComet’s impact
2.2. Development of the Earth’s AtmosphereDevelopment of the Earth’s Atmospherea.a. Reducing atmosphereReducing atmosphereb.b. Oxidizing atmosphereOxidizing atmospherec.c. Aerobic AtmosphereAerobic Atmosphere
3.3. Layers of the AtmosphereLayers of the Atmospherea.a. TroposphereTroposphereb.b. StratosphereStratospherec.c. MesosphereMesosphered.d. Thermosphere, ionosphere, exosphereThermosphere, ionosphere, exosphere
Origin of the AtmosphereOrigin of the Atmosphere
a.a. Earth’s lost atmosphereEarth’s lost atmosphere
1.1. Mostly cloud of silicate Mostly cloud of silicate vapor, condensed vapor, condensed forming solid rock (crust forming solid rock (crust 28% Si), other gases 28% Si), other gases swept away by solar swept away by solar winds.winds.
b.b. OutgassingOutgassing1.1. Release from interior of Release from interior of
young earth (water and young earth (water and rocks)rocks) Ex. CO2, ammonia, Ex. CO2, ammonia,
methane and watermethane and water GasesGases
Origin of the AtmosphereOrigin of the Atmosphere
c.c. Comets ImpactComets Impact Millions of years of Millions of years of
comentary impacts comentary impacts could have added could have added large amounts of large amounts of material to material to atmosphere.atmosphere.
Ex. CO2, CO, CH4, Ex. CO2, CO, CH4, N2) CO2 dominatedN2) CO2 dominated
Development of the Earth’s Development of the Earth’s AtmosphereAtmosphere
a)a) Reducing atmosphereReducing atmosphere Oxygen formed photo Oxygen formed photo
chemicallychemically H20 + UV raysH20 + UV rays H2(g) + 0(g) H2(g) + 0(g)
Hydrogen escapes but Hydrogen escapes but oxygen forms molecular oxygen forms molecular oxygen(02) and oxygen(02) and Ozone(03), small Ozone(03), small amounts of oxygen amounts of oxygen 1/1.0 *10^8 of present 1/1.0 *10^8 of present atmospheric levels atmospheric levels (Reducing atm)(Reducing atm)
Development of the Earth’s Development of the Earth’s Atmosphere Cont…Atmosphere Cont…
b.b. Oxidizing AtmosphereOxidizing Atmosphere Photosynthetic lifePhotosynthetic life New New
source of oxygen.source of oxygen. 2.2 to 2.0 bya O2 levels 2.2 to 2.0 bya O2 levels
increase to 1/100 of present increase to 1/100 of present levellevel
O2 moves into upper atmO2 moves into upper atm changed to 03changed to 03Blocks UV Blocks UV rad ( Effects?)rad ( Effects?)
c.c. Aerobic AtmosphereAerobic Atmosphere Sufficient O2 to support life Sufficient O2 to support life
forms that metabolize O2.forms that metabolize O2. Photosynthetic life increasePhotosynthetic life increase O2 production>Loss of O2O2 production>Loss of O2
Video clip of atmosphereVideo clip of atmosphere
Atmosphere
Layers of the AtmosphereLayers of the Atmosphere
a.a. TroposphereTroposphere Extends to about 11km.Extends to about 11km. Temperature decreases Temperature decreases
with height. Why???with height. Why??? TropopauseTropopause- place - place
above troposphere where above troposphere where temp does not change.temp does not change.
Varies depending on Varies depending on latitude Why??latitude Why??
Polar-<10kmPolar-<10km Tropics>15kmTropics>15km Mid latitude>10kmMid latitude>10km
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Layers of the Atmosphere Cont..Layers of the Atmosphere Cont..
b.b. StratosphereStratosphere Temp increases with Temp increases with
height b/c ozone layer is height b/c ozone layer is present which absorbs present which absorbs UV rad.UV rad.
O2 + UVO2 + UVO + OO + O O + O2O + O2 O3 O3
Ozone protects us from harmful Ozone protects us from harmful radiation. radiation.
Creation of a very stable part of Creation of a very stable part of the atmosphere (temp inversion)the atmosphere (temp inversion)
Stratopause-Stratopause- Place above Place above stratosphere where temp does stratosphere where temp does not increasenot increase
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Layers of the Atmosphere Cont..Layers of the Atmosphere Cont..
c. c. MesosphereMesosphereThe height of the The height of the mesosphere is between mesosphere is between 50-85 km.50-85 km.Temp decreases with Temp decreases with altitude.altitude.Meteors burn up in Meteors burn up in mesospheremesosphereMesopause-Mesopause- Place right Place right above the mesosphere above the mesosphere where temp does not where temp does not changechange
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Layers of the atmosphere cont..Layers of the atmosphere cont..
d. d. Thermosphere, ionosphere and Thermosphere, ionosphere and exosphereexosphere
Temp increases with height Temp increases with height
N2 and O2 absorb so much N2 and O2 absorb so much radiation that it becomes radiation that it becomes eclectically chargedeclectically charged help to help to transmit radio and television transmit radio and television waveswaves
The ionosphere is at a height of 80 The ionosphere is at a height of 80 to 550 kmto 550 km
The exosphere extends past The exosphere extends past 550km to outer space550km to outer space
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ESRT PAGE 14ESRT PAGE 14
Video clip Summary of AtmosphereVideo clip Summary of Atmosphere
Earth Atmosphere
Follow up questionsFollow up questions
1.1. What are the northern lights?What are the northern lights?
2.2. What is the atmosphere?What is the atmosphere?
3.3. How does the atmosphere protect life on How does the atmosphere protect life on earth?earth?
4.4. How many layers in the atmosphere?How many layers in the atmosphere?
SummarySummary
Stages of Atmosphere DevelopmentStages of Atmosphere Development Lost atmosphere, Outgassing, comets impactLost atmosphere, Outgassing, comets impact Reducing atmosphere, Oxidizing atmosphere, Aerobic Reducing atmosphere, Oxidizing atmosphere, Aerobic
Atmosphere.Atmosphere.
Layers of Atmosphere/PollutionLayers of Atmosphere/Pollution Troposphere-Lowest Layer of Atm, temp decreases Troposphere-Lowest Layer of Atm, temp decreases
with heightwith height Stratosphere-2Stratosphere-2ndnd layer of atm, temp increases with layer of atm, temp increases with
heightheight Mesosphere-3Mesosphere-3rdrd layer of atm, temp decreases with layer of atm, temp decreases with
height.height. Thermosphere-4Thermosphere-4thth layer of atm, temp increases with layer of atm, temp increases with
height.height.
