Seasonal and yearly variations of chemical compositions of rainwater collected at the summit of Mt. Sefuri, North Kyushu, Southwest Japan

Abstract

In this study, we analyze the seasonal and annual changes in the chemical composition of rainwater collected continuously at the summit of Mt. Sefuri since 2013, and consider the behavior of elements in the atmosphere.The concentration of inorganic elements in precipitation increased from winter to spring and decreased from summer to autumn. The elements with high concentrations and clear seasonal changes were Cl and Na, and their v was almost the same as that of seawater. It is thought that the Na and Cl contained in rainwater are strongly influenced by seawater. The Mg concentration also shows a roughly positive correlation with Cl, but its Mg/Cl ratio is generally slightly higher than that of seawater.