RELATIVE “Sr CONCENTRATIONS IN SURFACE AIR
3
AUGUST AND SEPTEMBER
SEPTEMBER AND OCTOBER
aL_
FEBRUARY AND MARCH
MARCH AND APRIL |
Sok
7 7
_I
iE
0
=
|
3
2
{~
i
|
i
=o
OCTOBER AND NOVEMBER
NOVEMBER AND DECEMBER
—
pe Toe
3
|
{
!
PE
OTD
ae
|
|
os
Ley
!
|
!
|
40°N
L
30°N
LL
JUNE AND JULY
JULY AND AUGUST
|
be
7
4
Pe
a
_
—
0
60°N
|
—
|
TT ~T
|
=m
4
i
DECEMBER AND JANUARY
JANUARY AND FEBRUARY
2
=
APRIL AND MAY
MAY AND JUNE
=
0
L_
-=—
627
!
|
20°N-_—sICPN
0 60°N
LATITUDE
_L
40°N
|
30°N)
-
—
|
L
20°N-OPN
0
_ee
Fig. 9—Relative Sr concentrations in precipitation and tropospheric
aty in the northern hemisphere. ———, average bimonthly precipitation
vs. bimonthly precipitation (1962-1963 HASL pot and column network);
, average bimonthly ?Sr concentration vs. bimonthly *Sr concen-
tration {1962—1963 80th meridian (west) network].
The relative rainfall values were plotted as the reciprocal in this graph
to make the correlation easier to See.
It is certainly very clear that inthefirst two periods when no highs
in air concentration occurred an inverse proportional relation exists.
In the subsequent periods, although the relation is not quite as simple,
a general dependence of air concentration upon precipitation is exhibited. For example, at the highest northern-hemisphere peak time
(March and April), it would appear thatthe relative high at low latitudes
must be due in part to the relatively low rainfall in the immediately
preceding time period. Conversely, in the middle latitudes at that time,
the much lower relative “Sr values correlate with higher precipitation.
Undoubtedly, this effect cannot completely explain the bimonthly
profiles of air concentrations, but it does appear to influence the data
to a measurable degree. It is felt that major meteorological airtransport mechanisms determine the broad patterns and timing of