抄録
In recent years, global warming is aggravated and is feared to cause climate change. The IPCC reportsthat the anthropogenic CO2 has affected the steep global warming. Therefore, many researches have been carried out about CO2. But there are many unclarified factors in CO2 behavior. So the fluctuation of atmospheric CO2 concentration is not grasped yet. In this paper, a time series analysis has been carriedout using observation data. And we have aimed at getting a hold of the fluctuation characteristics of atmospheric CO2 concentration and clarifying factors affecting it.
In result, we confirmed quantitatively the cause of seasonal cycle in atmospheric CO2 concentration. Moreover, we discussed effect of SOI, solar activity and economic activity on unclarified long periodic behavior.
