6.4　Methods of processing data

Through the above channels,we obtained the global ozone content testing site data.This data covers the data for each month since 1979,and the data for the missing months are filled by the average data for that site for that year.So that we can get a detailed ozone content of the spatial and temporal distribution of data.The global ozone content data are averaged over the data measured at each site.

Based on the study of the spatial distribution of ozone,we found that the ozone content in the northern and southern hemisphere with the year vary.Therefore,we first analyze the changes in global ozone levels from 1979 to the present.In this paper,a DHR-based time series analysis prediction model is established,and the abovementioned time series are analyzed,then the global ozone content is predicted after 50 years.Get the general trend of the global ozone content.

Taking into account the ozone content of the north and south hemisphere differences,this paper in the northern and southern hemispheres were selected 25 representative of the ozone detection point,whichever is the average value as the average of north and south hemisphere ozone content.And then the data of the northern and southern hemispheres were analyzed and processed.Finally,the global ozone trend is obtained by integrating the north and south data.