Atmospheric trace gases - Possibility of sources in the Southern Hemisphere

When measurements of globally distributed trace gases establish their existence in the Southern Hemisphere, it is not always clear whether their presence is due to transport from the Northern Hemisphere or partly from significant sources in the Southern Hemisphere. In this paper a simple criterion is developed whereby one can determine if significant Southern Hemisphere sources exist for a given trace gas. Despite the limitations of the model, there are strong indications that C2 hydrocarbons (C2H2, C2H4, C2H6), CO and CH4 have significant Southern Hemisphere sources.