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Using investigation on As in Jiaozhou Bay in April and July 1981, this paper researched the vertical distribution and seasonal variation of As contents, and defined the mechanisms. Results showed that As contents in surface and bottom waters were both in order of spring > summer. The sedimentation of As from surface waters to bottom waters indicated the dilution effect and accumulation effect in water body. The seasonal variation of As contents in surface waters was determined by the changes of As input from river runoff and overland runoff, while in bottom waters was determined by the changes of water body’s dilution effect and accumulation effect. In April and July 1981, the change ranges of As contents were closed. In case of As contents were low in surface waters, there was not significant dilution effect or accumulation effect in bottom waters. While in case of As contents were high in surface waters, there was accumulation effect in bottom waters. From temporal and spatial scales, and in April and July 1981, As contents in both surface and bottom waters were showing consistent trends of decreasing from the inner of the bay to the bay mouth, and to the open waters. The sedimentation of As determined the horizontal distributions of As contents in surface and bottom waters to be consistent. Furthermore, the mechanism of the seasonal variation of As was provided, as well as a block diagram model.

Mechanism and block diagram model for seasonal variation of As in Jiaozhou Bay