620
VOLCHOK
these data, although some specific oscillations should be mentioned,
For instance, at Chacaltaya a peak in July or August seems to appear
quite regularly, whereas at the three southernmost sites, Santiago,
Puerto Montt, and Punta Arenas, a peak in the early part of each year
seems to appear. These variations are believed to be quite significant
and will be referred to again in a later section.
89¢r/390Sr RATIO IN GROUND-LEVEL AIR
A broad impression of the homogeneity of the ground-level air in
1963 can be gained by study of the "*Sr/*Sr ratio measured in 80th
meridian samples. Figure 4 is a plot of this ratio for sites in the
northern hemisphere. Also included on the graph are data from a few
PO
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Fig. 4—"Sr/?Sr in air and precipitation in the northern hemisphere in
1963,