RELATIVE Sr CONCENTRATIONS IN SURFACE AIR
619
higher latitudes. This makes it difficult to delineate arrival time as a
function of latitude. The peaks seem to occur in the months of April,
May, and June, as in previous years, with no particular trend along the
meridian, The high Sr concentrations in air for 1963 are in agreement
with the high levels of “Sr deposition,” but it is interesting to note that
the peak in fallout deposition in the northern hemisphere seemsto have
occurred a month or two later than the peak observed in the groundlevel air.?
Figure 3 is a copy of NRL’s Sr concentration graph for the 80th
meridian sites in the southern hemisphere with HASL’s 1963 data added.
As in the north, the Sr air concentrations were generally higher than
in previous years; however, they were not as sharply defined as those
in the northern hemisphere. No generalized seasonal peak is shown in
107?
1
GUAYAQUIL
3
or
'0
-4
tw
LIMA
95- ACTIVITY, PC/SCM OF AIR
4
nA|
|
|
|
|
i
1073 {
1074
PUERTO MONTT
ormaPo
4
+
|
ad)Ae" one
+
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ongPp 1
|
PUNTA ARENAS
Pop,
1957
1958
Qo.
+
Cono---04
|
1073
1074
ot
Nmappoeees
SANTIAGO
1073
A,ol
4
|
woes L
10-4
os
"
+
+
|
ANTOFAGASTA
|
pomp
+
CHACALTAYA
1o73 F
1074
|
|
a
10" 3
1074
Pp
|
spe oe
eee
et
T
+
|
4
|
~~
4
.
1959
1960
1961
1962
1963
Fig. 3—Concentrations of 9Sr in the air at selected sites in the southern hemisphere along the 80th meridian (west). 1957-1962, NRL data;
1963, HASL data.