Vertical profiles of ozone, carbon monoxide, and dew‐point temperature obtained during GTE/CITE 1, October‐November 1983

A set of 14 pairs of vertical profiles of ozone (O3) and carbon monoxide (CO), obtained with fast‐response instrumentation, is presented. Most of these profiles, which were measured in the remote troposphere, also have supporting fast‐response dew‐point temperature profiles. The data suggest that the continental boundary layer is a source of tropospheric ozone, even in October and November, when photochemical activity should be rather small. In general, the small‐scale vertical variability between CO and O3 is in phase. At low latitudes this relationship defines levels in the atmosphere where mid‐latitude air is being transported to lower latitudes, since lower dew‐point temperatures accompany these higher CO and O3 concentrations. A set of profiles which is suggestive of interhemispheric transport is also presented. Independent meteorological analyses support these interpretations.