48 RADIATION 
structing instruments to be mounted in aircraft. This 
would shift investigations mto entirely new channels. 
3. Adequate data concerning the content of water 
vapor and carbon dioxide of the upper troposphere and 
the lower stratosphere are needed for investigation of 
tropospheric radiation by means of the familiar graphical 
methods. Spot checks are inadequate. Measurements 
are needed in such numbers that radiation changes 
with the weather situation become clear. The influ- 
ences of the geographical latitude and of continents 
and oceans on the content of water vapor and carbon 
dioxide must also be determined. The same holds true 
for the determination of the upper cloud boundary 
for various weather patterns and various types of cli- 
mate. Radiosonde observations are not sufficient for 
this purpose; direct observations from aircraft are 
needed. We must consider such observations as the 
principal demand which radiation research makes on 
the field of observational aerology. 
4. The influence of pressure on the absorption by 
CO, and O; in the 15-u band must still be investigated 
in the laboratory for application to the study of the 
radiation processes in the region of the tropopause. 
Only then can we approach an explanation of the radi- 
ation processes at these altitudes with any hope of suc- 
cess. 
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