It is not the present intent to analyze the Zimbabwe data in the same detail as is common in similar studies in North America or in Europe (e.g. Salmond, 2005), since such would require instrumentation and data collection more complex than was feasible. Instead, the analysis presented here is intended to draw attention to aspects of the surface boundary layer that are amenable to study without making use of advanced instrumentation or computer resources. It is a demonstration of comparatively simple measurement approaches that might have practical application in demanding circumstances. The micrometeorological flux determinations derived from this study will be presented elsewhere. The focus here will be on the way in which air-surface exchange occurs at night, on the utility of CO2 records as indicators of atmospheric processes, and on the applicability of simplified experimental approaches.