RELATION OF INDEX PATTERNS TO FALLOUT PEAKS
475
In the future the validity of the apparent relation between the
cyclone index and the shorter period fallout fluctuations will have to
be more thoroughly tested. Also, the proposed prediction model will
have to be refined and tested so that more quantitative estimates of
future fallout will be possible. The interaction between seasonal varia-
tions in the stratospheric circulation and the tropopause-level cyclogenetic process will have to be examined in far greater detail, especially in connection with the observed rates of depletion of nuclear
debris in the stratosphere.
ACKNOWLEDGMENTS
The author wishes to thank Elmar R, Reiter for the extensive
encouragement and guidance he gave while the research was being
performed. William D. Ehrman provided invaluable technical and
computational assistance, and Mrs. Viola Weiland typed the manuscript. The data used in the analysis were provided by the National
Weather Records Center in Asheville, N. C.
REFERENCES
1. L. M. Fry, F. A. Jew, and P. K. Kuroda, On the Stratospheric Fallout of
Strontium-90: The Spring Peak of 1960, J. Geophys. Res., 65: 2061-2066
(1960).
2. P. F. Gustafson, §. S. Brar, and M. A. Kerrigan, Appearance of a Spring
Maximum in Nuclear Test Debris in 1960, Science, 133: 460-461 (1961).
3. D. H. Peirson, Beryllium-7 in Air and Rain, J. Geophys. Res., 68: 3831-
3832 (1963).
4, W. F. Libby and C. E. Palmer, Stratospheric Mixing from Radioactive Fallout, J. Geophys. Res., 65: 3307-3317 (1960).
5. W. F. Libby, Radioactive Fallout, Particularly from the Russian October
Series, Science, 45:151-175 (1959).
6. P. B. Storebg, Orographical and Climatological Influences on Deposition of
Nuclear-bomb Debris, J. Meteorol., 16: 600-608 (1959).
7. D. O. Staley, Evaluation of Potential-vorticity Changes near the Tropopause
and the Related Vertical Motions, Vertical Advection of Vorticity, and the
Transfer of Radioactive Debris from Stratosphere to Troposphere, J.
Meteorol., 17: 591-620 (1960).
8 D. O. Staley, On the Mechanism of Mass and Radioactivity Transport from
Stratosphere to Troposphere, J, Atmos. Sci., 19: 450-467 (1962).
9. Y. Miyake, K. Sarukashi, Y. Katsurage, and T. Kanazawa, Seasonal Variation of Radioactive Fallout, J. Geophys. Res., 67: 189-193 (1962).
10. J. D. Mahlman, Relation of Stratospheric-Tropospheric Mass Exchange
Mechanisms to Surface Radioactivity Peaks, Transport Processes in the
Atmosphere Leading to Radioactive Fallout, Progress Report No. 1, Technical Paper No. 58, Colorado State University, 1964.
ll. E. R. Reiter and J. D. Mahlman, Heavy Fallout over the Southern United
States in November 1962,
Transport Processes in the Atmosphere Leading
to Radioactive Fallout, Progress Report No. 1, Technical Paper No. 58,
Colorado State University, 1964.