北半球臭氧总量及大气环流与臭氧总量年际异常的联系

VARIATION IN TOTAL OZONE AND THE CONNECTION BETWEEN ANNUAL ANOMALIES OF ATMOSPHERIC CIRCULATION AND TOTAL OZONE IN THE NORTHERN HEMISPHERE

本文使用自然正交函数(EOF)展开、奇异值分解(SVD)等方法研究了北半球O_3总量变化的时空分布特征及O_3总量与30、100、500hPa月平均高度距平场之间的关系.EOF1的结果表明:北半球O_3总量变化具有明显的长期趋势,变化的最大幅值区在亚洲北部,以50年代至60年代末夏季的O_3总量减少最为稳定持久。SVD结果表明,北半球O_3总量短期年际异常与冬半年平流层中低层环流异常之关系最为密切。SVD1显示极涡加强(减弱)对应O_3总量减少(增多);SVD_2显示高纬高度场与O_3总量场纬向1波异常存在明显的关联。

Abstract By empirical orthogonal function (EOF) expansion and sin-gular value division (SVD), the temporal and spatial distribution of thetotal ozone variation in the northern hemisphere and the relationshipbetween the total ozone and 30-, 100- and 500-hPa monthly mean heightanomaly fields are examined. Studies indicate that the northern totalozone variation shows a pronounced secular trend with its maximumamplitude lying in sorthern Asia. We hold that the short-term annualanomaly of total ozone in the northern hemisphere has the closest relationwith the circulation anomaly in the middle and lower stratosphere in thewinter half year.