no. 3 



RADIATION OF THE ATMOSPHERE ANGSTROM 



41 



crease in the radiation with the time owing to the fact that the 

 temperature is always falling from evening to morning. 



It is of interest to find that the value of a, thus determined, is in 

 close agreement with the value deduced by Bigelow * from thermo- 

 dynamic considerations of the heat processes to which the atmos- 



Fig. 4. — Atmospheric radiation and temperature. Indio, Cal., 191 3. 

 Log E a t = Const. + a log T. 



phere is subject. Bigelow finds a to be equal to 3.82 and almost 

 constant at various altitudes. 



In regard to the connection that probably exists between the 

 effective temperature of the air and the temperature at the earth's 

 surface, I may refer to the theoretical treatment given in chapter III. 



1 Boletin de la Oficina Meteorologica Argentina, Octubre, 1912, p. 15. 



