RADIOACTIVITY ALONG THE 80TH MERIDIAN
[~
a
491
MAY=JUNE 1962
or
U.S.5.R. 196]
19~2 =
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PRE— 1961
=
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5
P
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21
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Ww
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T
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QU. S. 1962
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80PN
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I
60°N
40°N
|
20°N
oe
20°5
|
40°S
1]
60°5
LATITUDE
Fig. 10—Profiles of the Sr concentrations in May and June 1962 along
the 80th meridian (west).
was the dominant source of ™Sr in the air of the northern hemisphere
but was of minor importance south of the equator. The shape of the
profile for the fresh debris, which is distinctly different from that for
the older debris, suggests a limited exchange of tropospheric air
across the equator followed by entrainment of the transferred air ina
rising cell that descends to ground level in the subtropical region of
the southern hemisphere. The highest concentrations of Sr in the
$ID