Tracers without feedback on the atmosphere are used to probe tropospheric transport. Such passive tracers are considered for two important anthropogenic sources, Europe and eastern North America. The linearity of passive tracer continuity allows transport to be formulated in terms of a Green function, G. A coarse-grained Green function is defined that is suitable for numerical investigation with a GCM. An ensemble of independent realizations of the atmosphere is used to obtain the model's ensemble mean, or ''climate'' Green function. With increasing time, the individual realizations of G converge to their climate mean and this convergence is quantified in terms of the decay of ensemble fluctuations. Throughout, G is analyzed with the goal of gaining new insight into the tracer climate that results from constant sources.
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Mark Holzer (1999) studied this question.
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