Different types of seasonal changing processes of Pb in Jiaozhou bay

This paper analyzed the seasonal variations of Pb in surface and bottom waters in Jiaozhou Bay based on investigation of Pb in surface and waters in different seasons during 1979-1983. Results showed that at temporal scale, Pb contents in bottom waters were more or less increasing/decreasing along with the increasing/decreasing of Pb contents in surface waters. Meanwhile, the sedimentation, accumulation and fixing of Pb were also important factors influencing the seasonal changing of Pb in waters. The seasonal changing of Pb contents within year in surface and bottom waters was forming different curves, i.e., Peak type, Lagged type and Superposed type. These findings would be helpful to understand the influences of the variations of Pb contents in surface to which in bottom waters, as well as the seasonal variations of Pb contents in both surface and bottom waters.