Abstract

Condensation nuclei (CN) concentrations in the upper troposphere/lower stratosphere were measured for 15 months in the late 1970’s during the Global Atmospheric Sampling Program. Automated instrument packages on 4 commercial transport aircraft recorded CN concentrations several times per hour during routine passenger-carrying operations above 6 KM MSL over much of the Northern Hemisphere. These data show clear evidence that CN are well-mixed in cloud-free tropospheric regions, that the dominant sources of CN are in the troposphere or at the earth’s surface, and that the cold trap at the tropopause is a region of primary CN nucleation or a region where otherwise undetectable CN are caused to grow to sizes detectable by the GASP CN instrumentation.

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