Papers in Meteorology and Geophysics

The computational efficiencies of the hole relaxation and Kamenkovich's method in solving vorticity equations in multi-connected regions are compared. Kamenkovich's method is somewhat modified. Although some extra region is required to store the homogeneous components of solution in Kamenkovich's method, it has some superiorities over the hole relaxation, especially in the initial-value problems: the computer time required to calculate one iterative step is shorter and the convergence of iteration is faster in Kamenkovich's method than in the hole relaxation. In particular, the difference in the convergence speed is large in the cyclic-channel cases.

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The correlation coefficients of total ozone with altitudes and with air temperatures referring to the standard isobaric surfaces of upper air data have been investigated at 5 stations in Japan during the period January 1979 through April 1983. It has been statistically confirmed that total ozone amounts increase with decrease in altitude at all levels, with increase in temperature at about 250 mb level or higher and with decrease in temperature at about 300 mb or lower at Sapporo, Tateno and Nemuro in winter, chiefly January, February and March in the above 5-year period, and also at Kagoshima and Naha in the one-year period of September 1980 to August of 1981. It is shown that the high total ozone amount is frequently observed around a trough, particularly west of the trough. Further, it is inferred from the data at Sapporo for January in the period of 1971 to 1983 that the large positive differences of monthly mean total ozone amounts from the 10-year means are related to the intensified Aleutian anticyclone in the stratosphere.

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