Abstract
Summary Changes in cloud amounts will disturb the existing complex balance of radiative energy. An increase in high cloud would reduce the initial input of energy into the atmosphere, and this study is directed to examine the high cloud amounts during the periods 1950–54 and 1966–70. Using information from Albuquerque, Denver and Lander increases of 25, 68 and 57 % in amount, respectively, are shown. Even at a Pacific island an increase of 152% is noted while three stations in the Sudan average 47% increases. Eight stations in western Chad, well removed from major airlines, showed only an 11 % increase. This investigation suggests that the increases may be due to long‐term changes in atmospheric turbidity, perhaps aggravated by jet aircraft contrails.
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