It is very important to grasp the behavior of CO
2 concentration considered to affect global warming. The IPCC reports that the anthropogenic CO
2 has affected the steep global warming. Therefore, many researches have been carried out about CO
2. But there are many unclarified factors in CO
2 behavior. So the fluctuation of atmospheric CO
2 concentration is not grasped yet. In this paper, time series analysis and covariance structure analysis have been carried out using the observation data. And we have aimed at getting a hold of the fluctuation characteristics of atmospheric CO
2 concentration and clarifying factors affecting it. As a result, we confirmed quantitatively the cause of seasonal cycle in atmospheric CO
2 concentration. Moreover, by covariance structure analysis, we discussed the effect of global environmental factors and economic activity on unclarfied long periodic behavior.
抄録全体を表示