Files 3e -2- February 3, 1959 MIT = Rain study The Thursday mornin, weeting was attended by Dr. Pauline Austin and Messrs. Newell and Fleisher..of the Radakeiteteorolosy group, Drs. Victor Starr, £&. Lorenz and %. White of the General Circulation Project, Prof. Winchester of the Ceology Department, Drs. &. iartell and Cc. Junge of the Air Force Cambridge Research Center, Dr. L. ‘achta of the Weather bureau, and syself. In order to learn more about both the scavenging of particulates by rain and the physics of precipitation, it was agreed: (a) The MIT studies of total beta activity in very short-period rain samples, collected by a 25 square foot collector, should be continued and modified to include counting both the filtrate and the residue. (b) For selected cases, these 1/2 - liter samples should be recombined and sent to Dr. Martell for Sr70 and ph210 analysis. (c) DOr. Junge will analyze these seme samples for natural salts, the vertical concentration profiles of which sre sufficiently well known to give an indication of the volume of air scavenged. If the pp-ll can be related to volume scavenged, then the salt concentration way give information on the altitude of fermation of the rain. (d) A 250-ce aliquot will be set to USGS in Washington for D/li and 01:/015 ratio measurements. It is hoped that these ratio can be correlated with condensation mixing ratio sufficiently closely to permit its use for indirect measurement. Together with the other two tracera this would sive considerable information regardin;, the condensation and scavenziny process. (e) Martell and inchester will explore the possibility of havin: Dr. J. Arnold at Scripps Institution of Oceanography analyze selected larze-volume samples for Be’, $ 35nd p32, natural cosmic-ray induced activities which are useful for identifying the proposition of scaven;ed particles which are of recent stratospheric origin. Dr. “achta will coordinate the project from the standpoint of fallout, and is authorized to spend with MIT up to $5,000 of AEC transferred funds. 4. MIT + Stratospheric Circulation Project The Thursday afternoon meetin: was attended by Starr, Lorenz, White, Machta, Martell, Junce, Fleisher and myself. The meeting sewed mainly to bring Starr's yroup up to date on the radicactivity data and problems in interpretation, and to bring the ‘nuclear’ croup up-to-date on the general circulation studies at stratospheric altitudes. Crneré iin, 7 Teen : orricep WNdervay,White,aleadin:| worke rocess of transferrin: ry 2 :eneral circulation, is in to work fulll time on thip SURNAME > project. DATEp |_ aL.. Form AEC-818 (Rev. +53) Starr's AEC 3 . ee en U. S$, GOVERNMENT PRINTING OFFICE 16—extel-2 | —-- | a ST : DOS ARCHIVES