Discussion 2

Wednesday 2/6Quiz prep + lecture 4

• Atmospheric composition• Atmospheric evolution – deep time, recent

CO2, CH4, CFCs• Carbon and hydrological cycles• Aerosols• Air pressure – Torciello, changes with height,

ideal gas law• Layers of the atmosphere• Temperature, heat transfer, radiation

Quiz Topics

N2

O2

Ar

O3

Inert gasesCO2

H2

←SO2, NO2,CFC’s, etc

PM

COCH4

N2O

Composition of the Earth’s Troposphere

Fig. 1-4, p. 7

Fig. 1-7, p. 9

Fig. 1-3, p. 6

Carbon Cycle

Fig. 1-5, p. 8

Hydrologic Cycle

Fig. 1-5, p. 8

Hydrologic Cycle

Fig. 1-13, p. 15

Fig. 1-14, p. 17

Fig. 2-7, p. 34

ELECTROMAGNETIC SPECTRUM

Insolation

• Earth’s tilt & the seasons• Angle of incidence & solar zenith angle• Earth’s energy budget– Insolation and re-radiation– Latitudinal heat balance– The greenhouse effect

Fig. 2-12, p. 42

HEATING OF THE EARTH’S SURFACE DEPENDS ON THE AMOUNT OF SOLAR RADIATION PER UNIT AREA.

SAME AMOUNT OF RADIATION IS DISTRIBUTED OVER A LARGER AREA IN A THAN IN B.

RADIATION PER UNIT AREA IS LESS IN A THAN IN B. LESS HEATING IN A THAN IN B.

Latitudinal Heat Balance

20 )1( eA RQE

Simple Greenhouse Model

24 4 eeR RTE

4

)1( 04

Q

Te

But this doesn’t factor in the atmosphere! 254K vs 288K

Project 1 – Hurricane Sandy

Project 1 – Hurricane Sandy