Concentrations of condensation nuclei in the vicinity of jetstream maxima

Ozone and condensation nuclei were measured on March 29, 1977 (and March 30 GMT), from a Sabreliner in a frontal zone south of Denver, CO. The ozone served as a tracer for stratospheric air and the condensation nuclei as a tracer for tropospheric air. Both the Langer condensation nucleus counter and the Rich-100 counter can be used to measure condensation nucleus concentrations in the vicinity of the tropopause; however, the former counter is more sensitive to low concentrations. The nuclei measured were almost all larger than 0.005 mu m in radius, consisting of thousands of molecules. The mesostructure of the ozone and condensation nucleus concentrations agreed well with a double structure of the frontal zone that became apparent from a detailed analysis of radiosonde data.