Lecture 32 SparksResearch2009 - 1.00 96.5% 95.3% Fractional...

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Unformatted text preview: 1.00 96.5% 95.3% Fractional Abundance 0.80 78.1% Venus Earth Mars 0.60 0.40 0.20 3.5% 20.9% 0.00 0.0% 2.7% 0.0% 0.1% 0.0% 0.9% 1.6% 0.0% 2.0% 0.0% CO2 N2 O2 Ar H2 O 1 Thermodynamics Kinetics If Earth’s atmosphere was in equilibrium (i.e. composition controlled by thermodynamics), reduced compounds would get oxidized and our atmosphere would be very similar to that of Venus and Mars. But, it is very different….. The Earth system is continually receiving reduced, energy-rich molecules………… Life (including humanity)!! 2 Monoterpenes/Sesquiterpenes Defensive compounds photosynthesis Diurnal mean in-canopy terpene concent ation r 0.8 Concentration (ppbv) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 4 8 12 16 20 24 Local time 3 Table1 compound 1st cut 2nd cut Acetaldehyde grams 0.0034 0.0228 Acetone grams 0.0080 0.0101 Hexenals grams 0.2404 0.8146 Hexenol+hexanal grams 0.0042 0.0192 Monoterpenes grams 0.0294 0.1750 Sesquiterpenes grams 0.3054 1.1123 average SQT/MT ratio 6.93 4.24 5.58 SQT/wound ratio 0.61 0.66 0.63 4 Monoter 20 18 16 14 12 10 8 6 4 2 0 24 22 0 Height of canopy (m) 20 40 60 80 -10 Concentration (pptv) 5 6 6 Total Reactive N Flux (ng N m-2 s-1) Wet Soils Dry Soils Radiation ~ 800-1000 W m-2 Soil Temperature > 60 °C 6 180 160 Total Reactive N Flux (ng N m-2 s-1) 5 5 140 4 120 100 4 3 3 80 2 60 40 2 1 1 20 0 3:00 5:00 7:00 9:00 11:00 13:00 15:00 17:00 19:00 0 0 21:00 Time (PST) 7 1.9 76 74 72 70 1.7 NT Flux Soil Temperature Total Reactive N Flux (ng N m-2 s-1) Surface Soil Temperature (°C) 1.5 1.3 68 1.1 66 0.9 64 62 60 0 5 10 15 20 25 30 35 0.7 0.5 Minutes Dry Soils Soil Respiration (µmol CO2 m-2 s-1) Soil Flux (ng N m-2 s-1) s Wet
Soils
 Soil Temperature at 1 cm (°C) 8 ...
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This note was uploaded on 01/10/2010 for the course BIOEE 2610 at Cornell University (Engineering School).

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