490
LOCKHART, PATTERSON, SAUNDERS, AND BLACK
T— JANUARY—FEBRUARY 1962
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U.S.5.R. 1961 DEBRIS
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PRE-1961 DEBRIS
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80°N
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60°N
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40°N
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40°S
60°S
LATITUDE
Fig. 9—Pyrofiles of the °Sr concentrations in January and February
1962 in the air along the 80th meridian (west).
monthly periods January and February, May and June, and November
and December as functions of the nuclear-test series serving as the
sources,
In the January and February period (Fig. 9), the old pre-1961
debris was of equivalent concentration in the two hemispheres and
showed the expected distribution with midlatitudinal maximumsand an
equatorial minimum. The fresh debris from the U.S.S.R. 1961 tests