Army Research Office, Office of the Chief, Research and Development, Washington, D.C. AIR BLAST PHENOMENA IN ARC IC CLIMATE, by L.F. Ingram. 1962, 9p. incl. illus. U classified rep rt Paper presented at the 1962 Army Science Conference, 20-22 June 1962, at the United States Military Academy, West Point, New York. DESCRIPTORS: *TNT, *Explosions, *Blast, Explosives, Shock waves, Pressure, Snow, Time, Measurement, Energy, Absorption, Reflection, Greenland, De onation, Arctic regions. In 1960, 4- and 32-lb TNT spheres were fired at scaled burst heights over natural and processed snow on the Greenland Ice Cap Camp Fistclench where the snow cover is 100 ft deep. Air-blast pressure-time easurements were made at the surface to obtain height-of-burst infor ation and at several elevations above the surface to determine Mach-triple-point loci. Surface pressure measurements were made at reduced horizontal distances. Pressure da a were obtained for the range 2- to 100-psi peak overpressure. Results show t t: (a) considerable energy is absorbed by snow; (b) snow cannot be regarded as an id al r flecting medium; and (c) the Mach stem formation over snow is not essentially different from t at over a rigid boundary. (Author).