Comparison of Ozone Variations Derived from Ozonesondes and Umkehr Measurements for the Period 1969–76

J. K. Angell Air Resources Laboratories, ERL, NOAA, Silver Spring. MD 20910

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J. Korshover Air Resources Laboratories, ERL, NOAA, Silver Spring. MD 20910

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Abstract

Ozonesonde data from Europe, North America and Japan provide estimates of temporal ozone variations in 8–16, 16–24 and 24-32 km layers in north temperate and polar regions from the sunspot maximum in 1969 through the sunspot minimum in 1976. These variations are compared with O3, variations obtained from Umkehr measurements in Europe and Japan. Comparison with total-ozone measurements suggests that 0.1 trends and quasi-biennial oscillations are somewhat better delineated by the existing ozonesonde network than by existing Umkehr measurements. Between 1969 and 1976 in north temperate latitudes the O3amount is indicated to have decreased by about 4% in the 16–24 km layer but to have remained essentially invariant in the 24–32 km layer. The decreasing trend in the 8–16 km layer is not clear-cut, nor is the trend in the 32–46 km layer (from Umkehr measurements only), because of the possible influence of the Fuego eruption on Umkehr measurements. The quasi-biennial oscillation in 03 shows up most clearly (percentage-wise) in the 8–16 km layer, with the O3 amount about 10% less near the time of quasi-biennial west wind maximum at 50 mb in the tropics than at the time of cast wind maximum. This percentage variation is reduced to about 5% in the 16–24 km layer, and 1% in the 24–32 km layer. In mid-latitudes the quasi-biennial oscillation in ozone descends at the rate of approximately 2 km month−1. An update shows that both total O3 and layer-mean O3 attained quite high values in north temperate latitudes during early 1977.

Abstract

Ozonesonde data from Europe, North America and Japan provide estimates of temporal ozone variations in 8–16, 16–24 and 24-32 km layers in north temperate and polar regions from the sunspot maximum in 1969 through the sunspot minimum in 1976. These variations are compared with O3, variations obtained from Umkehr measurements in Europe and Japan. Comparison with total-ozone measurements suggests that 0.1 trends and quasi-biennial oscillations are somewhat better delineated by the existing ozonesonde network than by existing Umkehr measurements. Between 1969 and 1976 in north temperate latitudes the O3amount is indicated to have decreased by about 4% in the 16–24 km layer but to have remained essentially invariant in the 24–32 km layer. The decreasing trend in the 8–16 km layer is not clear-cut, nor is the trend in the 32–46 km layer (from Umkehr measurements only), because of the possible influence of the Fuego eruption on Umkehr measurements. The quasi-biennial oscillation in 03 shows up most clearly (percentage-wise) in the 8–16 km layer, with the O3 amount about 10% less near the time of quasi-biennial west wind maximum at 50 mb in the tropics than at the time of cast wind maximum. This percentage variation is reduced to about 5% in the 16–24 km layer, and 1% in the 24–32 km layer. In mid-latitudes the quasi-biennial oscillation in ozone descends at the rate of approximately 2 km month−1. An update shows that both total O3 and layer-mean O3 attained quite high values in north temperate latitudes during early 1977.

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