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Environmental Chemistry

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Presentation on theme: "Environmental Chemistry"— Presentation transcript:

1 Environmental Chemistry

2 Carbon cycle Photosynthesis stores C in terrestrial and ocean biosphere Respiration releases CO2 back to atmosphere In order to allow build up of free O2, must not allow organic C to decay

3 Oxygen produced in photosynthesis is consumed by reactions with reduced Fe and S from lithosphere:
2 FeS2 + 15/2 O2 + 4 H2O  Fe2O3 + 4 H2SO4

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6 Links https://www.esrl.noaa.gov/gmd/ccgg/trends/

7 CO2 is increasing due to fossil fuel combustion
CH2O + O2  CO2 + H2O

8 Atmospheric O2 trend If CO2 is increasing, O2 should be decreasing

9 Nitrogen Cycle Processes

10 Brasseur, Orlando, and Tyndall, Atmospheric chemistry and global change, 1999.

11 Phase diagram for water
Thin line – saturation vapor pressure above supercooled liquid water Jacob, Intro to Atmospheric Chemistry, 1999.

12 Water/Ice vapor pressure table
Torr 100 760.0 -2 3.88 -30 .29 60 149.4 -4 3.28 -32 .23 50 92.51 -6 2.76 -34 .19 40 55.32 -8 2.33 -36 .15 30 31.82 -10 1.95 -38 .12 20 17.54 -12 1.63 -40 .097 10 9.21 -14 1.36 -42 .077 5 6.54 -16 1.13 -44 .061 4 6.10 -18 .94 -50 .0296 3 5.69 -20 .78 -60 .0081 2 5.29 -22 .64 -65 .004 1 4.93 -24 .53 -70 .002 4.58 -26 .43 -80 .0004

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14 Solar irradiance spectrum
Graedel and Crutzen, Atmospheric Change, 1993

15 Lifetime and variability
Hobbs, IAC, 2000.


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