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Observations of, and sources of the spatial and temporal variability of ozone in the middle atmosphere on climatological time scales (OZMAP) and equatorial dynamics: Seasonal variations of ozone trendsThe long term trends (least square linear regression with time) of ozone content at seven European, seven North American, three Japanese and two tropical stations during 21 years (1964 to 1984) are analyzed. In all regions negative trends are observed during the 1970s, but are partly compensated by limited periods of positive trends during the late 1960s and late 1970s. Solely the North American ozone data show negative trends in all 10 year periods. When the long term ozone trends are evaluated for each month of the year separately, a seasonal variation is revealed, which in Europe and North America has largest negative trends in late winter and spring. While in Europe the negative trends in winter/spring are partly compensated by positive trends in summer, in North America the summer values reach only zero, retaining the significant negative trend in annual mean values. In contrast to the antarctic ozone hole, the spring reduction of ozone in Europe and in North America is associated with stratospheric temperatures increasing in the analyzed period and therefore is consistent with the major natural ozone production and loss processes.
Document ID
19890020545
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Entzian, G. (Academy of Sciences Potsdam (German D.R.)., United States)
Grasnick, K. H. (Academy of Sciences Potsdam (German D.R.)., United States)
Taubenheim, J. (Academy of Sciences Berlin, German D.R. , United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1989
Publication Information
Publication: International Council of Scientific Unions, Middle Atmosphere Program. Handbook for MAP, volume 27
Subject Category
Geophysics
Accession Number
89N29916
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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