Studies of stratospheric eddy transport. 1: The observed ozone flux by the transient eddies, 0-30 KM. 2: Eddy diffusion coefficients and wind statistics, 30-60 KM

摘要

In Part I, Ozonesonde data were matched with concomittant rawinsonde data to provide a direct determination of meridional flux of ozone by transient eddies. Data are from about 25 stations in eastern and western North America, western Europe, and Japan. Results generally confirm the existence of significant northward flux, 10-18 km, in winter/spring; however, areas of significant equatorward flux have been found at high mid-latitudes, 10-16 km, over North America in winter/spring and at all latitudes, 10-18 km, over Japan in spring. Fluxes are typically small in summer, as well as throughout the troposphere, and throughout most of the middle stratosphere. Qualitative statements are made concerning the relative importance of mean meridional and standing eddy fluxes. Rocketsonde data, 30-60 km, 1961-1976, are the data base used for the three components of the eddy diffusion matrix and circulation statistics. Horizontal diffusivities are obtained from the variance of the meridional wind and the meridional wind's integral time scale. The present results are generally smaller than past estimates, presumably because temporal variations longer than a month were filtered out in this work. Estimates of Kyz are based on the tentative assumption that the diffusivity is proportional to the slope of the isentropic surfaces.