Abstract:Based on the Multi-Sensor Reanalysis version 2data, which was validated by the data from 6ground-based observation stations belonging to the World Ozone and Ultraviolet Radiation Data Centre, this study analyzed the temporal and spatial variabilities of total ozone over China for the period 1971~2020. It was found that the total ozone over China showed a slight downward trend in the past 50years. The annual mean total ozone reached a maximum value of (347.5 ±53.8) DU in 1978 and a minimum one of (291.9 ±29.5) DU in 1993. In the three sub-periods, 1971~1978, 1978~1993, and 1993~2020, the annual mean total ozone over China completely increased, decreased, and increased, respectively. The seasonal variability of the monthly mean total ozone presented a sinusoidal wave with a maximum value of about 338DU in March and a minimum value of about 285DU in October. The spatial distribution of the annual mean total ozone over China in the past 50years showed a latitudinal pattern by decreasing gradually from northeast areas to southwest areas. Moreover, the values could be greater than 360DU in the northeast China with latitudes over 40°N. The spatial distribution of monthly mean total ozone also showed a latitudinal pattern. In addition, the temporal and spatial variation coefficients showed similar seasonal variability, with the minimum value in summer, followed by the values in autumn, spring, and winter. Namely, the variability of total ozone and its spatial difference was minimum in summer. Finally, the trend of total ozone varied with periods and areas in the past 50years. During the period 1971~1978, the increase value and rate of annual mean total ozone showed a latitudinal pattern by decreasing gradually from north areas to south areas. In the areas with relatively high annual mean total ozone, such as the north China with latitude over 40°N, the maximum increase value was 56DU, around 16%. Yet, in the areas with relatively low annual mean total ozone, such as the south China with latitude below 30°N, the minimum increase value was 12DU, around 5%. During the period 1978~1993, the decreased value and rate of annual mean total ozone also showed a latitudinal pattern. In the areas with relatively high annual mean total ozone, such as the north China with latitudes over 40°N, the maximum decrease value was 93DU, around 22%. Yet, in the areas with relatively low annual mean total ozone, such as the south China with latitude below 30°N, the minimum decrease value was 11DU, around 4%. During the period 1993~2020, the maximum increase value (18DU, about 6%) was found in the northwest areas. In contrast, the minimum increase value (4DU, about 1%) was found in the southeast areas.
谢静晗, 李飒, 肖钟湧. 50年来中国臭氧总量时空变化特征[J]. 中国环境科学, 2022, 42(7): 2977-2987.
XIE Jing-han, LI Sa, XIAO Zhong-yong. Investigating the temporal and spatial variabilities of total ozone over China for the past 50 years. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 2977-2987.
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