492
LOCKHART, PATTERSON, SAUNDERS, AND BLACK
— NOVEMBER — DECEMBER 1962
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PRE—1961
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60°N
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LATITUDE
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40°S
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Fig. 11—Profiles of 98&y concentrations in November and December
1962 along the 80th meridian (west).
southern hemisphere were observed at the high-altitude collecting
station at Chacaltaya,
In the March and April collections (profiles not shown) the pat-
terns of distribution of Sr in the ground-level air were relatively unchanged from the preceding period. Even at this date negligible pene-
tration of
the
fresher
debris to southern Chile had occurred. An
estimated 85% of the Sr activity at the three northernmost sites
(Thule, Moosonee, and Washington) can be attributed to the U.S.S.R.