.
4
>
‘
that the presence or absence of debris at the ground has little
quantitative relation to the amount of radioactive debris that
is airborne. This is due to the fact that the surface deposition .
‘
.is largely a function of the precipitation and without precipitation
a cloud might pass overhead undetected. Furthermore, the spread
rather detailed wind data, it is difficult to separate the growth
due
to
ghear
and
that
arno
te
AL
Ai fF Peoien,
T+ would
be
of
great
interest to determine the rate of turbulent exchange between the
stratosphere and troposphere, but the effect of precipitation in
addition to the fact that the initial vertical distribution of debris
. ds unknown precludes solution of the problem with the present data.
Cf equal interest would be the computation of the gross diffusion
- between the northern and southern hemispheres, but adequate data is
‘not available. while it is possible to estimate the fraction of the
total debris in the southern hemisphere, this information is still
insufficient to determine the coefficient of eddy diffusion across
the equator.
It must be concluded: that vt present, the meteorological use
of radioactive tracers from the Pacific tests has not yet appreciably —
improved the understanding of weather processes.
fund
J bo
ent inmscuas
of debris is also a function of the wind shear and unless there is