~~:
14
activity extending from Bikini to Eniwetok and continuing westward to the southwest corner of the sampling area.
The highest
ct eee
levels along this line were greater than 50,000 c/m/g in the
area from Eniwetok to about 35 miles westward.
In the area sur.
veyed, the lowest values were in the northwest quadrant, with
the minimum value, 1,300 d/m/g, at the most northwesterly sta-
tion, 1A, at 14° N - 159° E.
The plankton tows were made to a depth of about 200 meters,
which assured complete sampling of the stirred layer.
It is
generally accepted that the stirred layer exists only above the
thermocline,
Ne
a region in which temperature decreases rapidly,
with increase in depth.
Bathythermograph casts were made at
each station to determine temperature changes with depth and
we
“
ey Same mileate neehaar Rehdoem NA a
wee eee nee
:
amples of bathythermograph traces are shown in Pigure ll.
Ex-
Sur© ellen ASA
ce
ne ee
from these data the area of the thermocline was determined.
face temperatures were approximately 81° to 83°F and remained
practically unchanged to a depth of about 300 feet;
feet temperatures decreased,
below 300
and at the 450 foot level were 709
to 74°F, indicating that, in general,
the upper limit of the
aan
thermocline was just below 300 feet or about 100 meters.
Water:
|
The radioactive content of the water samples from
the fifty-three collecting stations 1s presented in Table l.
The sums of the values of radioactivity of the residue from one |
liter of sea water and of the filtered water, less KO for each
station and depth are given in Table 2.
Table 3 summarizes the
percentage contribution of each component to the total radio-
28
.
Pe
activity for all stations at each sample depth.
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UNW. Or Vee...
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