Profiles of CF 2 Cl 2 , CFCl 3 , CCl 4 , and N 2 O in the lower stratosphere are reported from measurements made during a meridional survey in the Northern Hemisphere in the fall of 1976. The latitude distributions obtained show a marked decrease in mixing ratio with increasing latitude from about lat. 7°N in the region of the Intertropical Convergence Zone to about lat. 79°N along the 159°W meridian. The results suggest the importance of meridional transport and mixing in the stratosphere in accounting, at least in part, for the observed profile variation with latitude.

Concentrated samples of stratospheric air were obtained at pressure altitudes of 18.3 km and 21.3 km aboard U‐2 aircraft, and at 28.3 km and 35.9 km aboard a balloon platform. The mixing ratios of CF2Cℓ2 and N2O are reported for locations in California, Oregon, Texas, and Quebec, Canada. The observed mixing ratios compare within a factor of 2 to those reported by other investigators and show a more rapid decrease with altitude than predicted by a two‐dimensional (2‐D) model.

In the paper "Lower Stratoshpere Measurements of Variation with Latitude of CF2C12, CFC13,