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picture1_Edu Jacob Lecture Eps200 Nitrogen Oxygen


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File: Edu Jacob Lecture Eps200 Nitrogen Oxygen
history of earth s atmosphere n 2 co2 o 2 o reaches ho 2 2 current levels oceans co form 2 life invades dissolves continents outgassing life forms onset of ...

icon picture PPTX Filetype Power Point PPTX | Posted on 07 Sep 2022 | 3 years ago
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                 HISTORY OF EARTH’S ATMOSPHERE
             N
              2
             CO2
                                                   O
                                                    2      O reaches 
             HO                                              2 
              2                                            current levels; 
               oceans  CO
               form          2                             life invades 
                         dissolves                         continents
   Outgassing        Life forms  Onset of
                     in oceans    photosynthesis
   4.5 Gy           4 Gy             3.5 Gy                0.4 Gy                present
   B.P              B.P.             B.P.                  B.P.
      Evolution of oxygen and ozone over Earth’s history
                           Life appears on land
       RUNAWAY GREENHOUSE EFFECT ON VENUS
  due to accumulation of water vapor from volcanic outgassing early in its history  
   …did not happen on Earth because farther from Sun; as water accumulated it 
   reached saturation and precipitated, forming the oceans
                       EARTH   VENUS
        Comparing the atmospheres of Earth and Venus
                                           Venus       Earth 
               Radius (km)                  6100       6400
               Surface pressure (atm)        91          1
                                                           -4
               CO (mol/mol)                  0.96      3x10
                  2
                                                 -2
               N (mol/mol)                 3.4x10       0.78
                2
                                                 -5
               O (mol/mol)                 6.9x10       0.21
                2
                                                -3         -2
               HO (mol/mol)                 3x10       1x10
                2
        BIOGEOCHEMICAL CYCLING OF ELEMENTS:
               examples of major processes
      Physical exchange, redox chemistry, biochemistry are involved
                                Surface
                                reservoirs
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...History of earth s atmosphere n co o reaches ho current levels oceans form life invades dissolves continents outgassing forms onset in photosynthesis gy present b p evolution oxygen and ozone over appears on land runaway greenhouse effect venus due to accumulation water vapor from volcanic early its did not happen because farther sun as accumulated it reached saturation precipitated forming the comparing atmospheres radius km surface pressure atm mol x biogeochemical cycling elements examples major processes physical exchange redox chemistry biochemistry are involved reservoirs...

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