Albuquerqt•e, New Mexico 87106Using the new 'box' method, it has been determined that the downward flux of atmospheric ozone over New Mexico soil averages 3 X 10 • molecules/cm2 sec, and over the Atlantic Ocean averages 0.2 X 10 n molecules/cm2 sec. Estimates for the global ozone sink range from 5.4 to 8.6 X 10 '• ozone molecules/sec, or 1.3 to 2.1 X 10 • tons of ozone per year.

During the period November 1964 to October 1965 a total of 89 samples of précipitation were collected at the Am undsen-Scott Station. Oxygen isotopes analysis discloses the présence of an 'isotopic sum m er' and an 'isotopic winter'. Thèse results combined with upper air observation perm it the form ulation of a relationship between SQX of précipitation and the tem pérature of an effective condensation level. A simple m odel based on equilibrium Rayleigh condensation processes for moist air masses over Antarctica is advanced.

Simultaneous measurements of the vertical fluxes of ozone and heat were made near Albuquerque, New Mexico, in 1968, together with measurements of the vertical profiles of ozone and temperature in the first 16 meters above the surface. The eddy flux of ozone was determined by a new method using the decay of ozone in a box with open bottom, placed on the ground. The eddy flux of heat was determined as the difference between the net radiative flux and the soil heat flux. The vertical distributions of ozone, temperature, and wind were measured with sensors mounted on a platform that was raised and lowered electrically along a 16-meter tower. The profiles and the flux values are used to compute coefi% cients of eddy diffusivity of ozone and heat. The results show that measurements of the ozone flux and of the ozone gradient can be used for determinations of the eddy transport of atmospheric properties in low-wind situations, whenever measurements of temperature or wind profiles, and of the related fluxes, are not practical.

Data for the vertical distribution of ozone, for surface ozone and for total ozone collected at Amundsen‐Scott, New Byrd, and Hallett stations are presented and analyzed. Although the set of observations is not complete, the following conclusions appear to be valid: (1) Over the three stations there was no accumulation of ozone during the winter. (2) Large changes in the thermal structure of the stratosphere are not accompanied by large changes of the shape of the vertical ozone profile. (3) Surface ozone concentrations show a maximum early in the winter, at least over the western half of Antarctica. Concentrations are higher at Amundsen‐Scott station, in the polar plateau, than at any West Antarctica coastal station.

Climatological records from the Amundsen-Scott Station, South Pôle, show the summer 1957-1958 to be characterised by periods of exceptionally warm air température and above normal snow accumulation. The firn layer deposited during this summer displays an exceptionally high oxygen-18 content, as revealed by ISo/l^o ratio profiles obtained by Epstein et al. [6, 7] and by us in five pits dug alongside accumulation stakes. * Chercheur à l'Institut Interuniversitaire des Sciences Nucléaires, Belgique.