| Popis: |
Ozone and temperature profiles were measured with balloon-borne instruments from McMurdo Station, Antarctica (77.85°S, 166.67°E) from late August to late October, on 39 occasions in 1994 and on 35 occasions in 1995. Minimum column ozone values of 138 DU and 139 DU were measured in 1994 and 1995, reduced from initial measurements in late August of 272 DU and 256 DU, respectively. These minima are higher than the record low measurement from McMurdo taken in October 1993 (130 DU), but lower than all other years since 1986 when ozone measurements were initiated at McMurdo. In 1994 and 1995, as in previous years, the onset of ozone recovery began mid-to-late October above 20 km. Below 14 km ozone concentrations have returned to pre-Pinatubo levels. Between 16–22 km they are near, and in 1995 often lower than, the record low levels set in 1993. In late August of 1995, the total and 12–20 km column ozone were also often observed to be near or lower than that for the same period of all previous years since 1986. By early October 1995, almost complete ozone depletion was experienced uniformly over the altitude region 14.5–19.5 km. |
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