Cd

High Latitude

Low Latitude

Figure 5.16 Tracer correlation schematic. Solid black lines are isopleths for tracer A, and gray dashed lines are isopleths for tracer B. Thin dashed lines are paths in the atmosphere over which the tracers are sampled.

isopleths of constituent A are shallower than those of constituent B. This situation is shown in the upper stratosphere in Figure 5.16. Because the isopleths are not coincident, there is not a single compact relation between constituents A and B. Instead, the correlation obtained depends on how the atmosphere is sampled. To illustrate this, Figure 5.16 also has four thin dashed lines on it—two vertical and two horizontal. Consider the two vertical lines first and imagine that one is measuring A and B along these two paths. On the equator ward line, one sees that concentration A5 is associated with B4. On the poleward line, A5 is associated with B6. Sampled this way, there appears to be a latitude dependence to the tracer relation [185]. Now consider the two horizontal lines and imagine measuring A and B along these two paths. On the lower altitude line, concentration A4 correlates with B4, and A5 correlates with B6. On the higher altitude line, concentration A5 correlates with B4, and A6 correlates with B6. Sampled this way, there appears to be an altitude dependence to the tracer relation.

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