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The Greenhouse Effect and Global Warming , What is it? How does it occur?. Carl N. Drummond Dean, College of Arts and Sciences. Science Café, November 30, 2010. The Global Energy Balance. Energy from the Sun. Terrestrial Radiation. Sun: 6000K, Q = 3.87 x 10^26 W, S 0 = 1367 W/m^2.

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The Greenhouse Effect and Global Warming,

What is it? How does it occur?

Carl N. Drummond

Dean, College of Arts and Sciences

Science Café, November 30, 2010


The Global Energy Balance

Energy from the Sun

Terrestrial Radiation



The Sun is cool !

Infrared

Ultraviolet

6000 K

Max Planck, 1900

Intensity

5000 K

4000 K

Wavelength


Solar Flux

S0 = 1367 W/m^2

A = πr^2

Earth’s Incoming Solar Radiation

SI = S0πr^2 / 4 πr^2

SI = S0 / 4

SI = 342 W/M^2

So what happens

to all this energy?



Surface Albedo

0.7

0.3

Stratocumulus

Cirrus



Sun

Earth

Water Gap

CO2 Greenhouse


Venus : 96% CO2, 92 bar

S0 = 2632 W/m^2

Te = 230 K

Ts = 760 K = 980°F

GHE = 530 K

0.77

Earth: 0.007% CO2, 1 bar

S0 = 1367 W/m^2

Te = 250 K

Ts = 288 K = 58°F

GHE = 38 K

0.30

Mars: 95 % CO2, 0.006 bar

S0 = 589 W/m^2

Te = 220 K

Ts = 230 K = - 45°F

GHE = 10 K

0.24

0.12



Direct Measurements

Glacial Ice Bubbles


CH2O + O2 → CO2 + H2O


Planting Trees Will Not Help

So where will all the CO2 go?


The Triumvirate of the Global Carbon Cycle

Jacques Joseph Ebelmen

(1814 – 1852) Ecole des Mines

Harold C. Urey

(1893 – 1981) Univ. of Chicago

Robert A. Berner

(1935 – ) Yale




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