SESSION IIB DISCUSSION INDIVIDUAL PAPER DISCUSSION Discussions that took place following the presentation of individual papers are given in this section. These discussions preceded the scheduled general discussions for the session. KRUGER: Mr. List, your values for annual fallout concentration over the United States seem quite reasonable, In trying to compare the East Coast value to the Midwest value, have you tried to separate the East Coast concentration into two components: that part which originates from polar sources, which is comparable to the Midwest data, and that part from tropical sources, which is not comparable ? LIST: No. REITER: Dr. Newell, are there any meteorological data that would substantiate your claims concerning the difference between hemispheres? NEWELL: There are the data by Lamb and Obasi that which suggest standing eddies in the troposphere play a smaller role in the southern than in the northern hemisphere. Sudden warmings in the stratosphere are more gradual in the southern hemisphere according to Godson’s work. Ozone data summarized by Ramanathan at the Arosa Ozone Symposium suggest smaller total amounts in the southern hemisphere; however the number of collecting stations in this hemisphere is very small. SAUCIER: Mr. Gudiksen, concerning your closing remarks, do you imply conservation of mass in the jet-stream core for a week or 687

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