Abstract
Seasonal variation of stratospheric aerosol content is discussed on the basis of laser radar measurements at Nagoya (35°N, 137°E) Japan. Analytical results suggest that there were noticeable winter maximum of aerosol content, and this was in good agreement with other investigators' measurements (Hofmann et al., 1975; Bigg, 1975; Hofmann and Rosen, 1977; Reiter et al., 1979). In summer season 1977, and possibly 1976, second maximum of aerosol content was suggested in laser radar measurements at Nagoya. Maximum of stratospheric aerosol content in summer season can be found, though it is small, in the analytical results by Gras and Laby (1979) who suggested the second maximum of aerosol ocntent in summer (southern hemisphere) 1975, and by Reiter et al. (1979) whose results contained small maxi-mum of loading in summer 1977, and 1978. Summarizing various measurements, the winter maximum of aerosol content is always observed on the global scale, and summer second maximum of loading can be sometimes observed.
Present analytical results suggest that the flux of sulfur compounds of 5×107 (S) atoms/cm2/sec from troposphere to stratosphere is necessary to compensate the sedimentational loss of particulate matter if it is assumed that the stratospheric aerosol is composed of sulfuric acid of 75% in weight.
