ESS220
Prof. Jin-Yi Yu
Planetary Energy Balance
atmos_temperature_vertical
§ Energy emitted by Earth  = Energy absorbed by Earth
     sTe4   x  (4p R2Earth )  =  S p R2Earth   x  (1-A)
                               sTe4  =  S/4 * (1-A)
   
                                        = 1370/4 W/m2 * (1-A)
                                        =  342.5  W/m2 * (1-A)
                                        =   240    W/m2
§ Earth’s blackbody temperature                                 
                  Te = 255 K (-18C)
Earth’s surface temperature
TS = 288 K (15C)
greenhouse effect (33C) !!
(from Global Physical Climatology)