Seasonal Variation Mechanism of Hg in Jiaozhou Bay 1988

Abstract

This paper analyzed the vertical distribution and seasonal variation of Hg in waters in Jiaozhou Bay in 1988. Results showed that Hg contents in surface and bottom waters were in order of spring >summer. In case of Hg contents were relative high/low in surface waters, Hg contents in bottom waters were also relative high/low. The continuous sediment of Hg resulted in dilution and accumulation effects in bottom waters. The relative high Hg contents resulted in dilution effect in bottom waters, while the relative low Hg contents resulted in accumulation effect in bottom waters. The seasonal variations of Hg contents in surface waters were determined by the changes of the major Hg sources, while the corresponding seasonal variations of Hg contents in bottom waters were results of accumulation effect and dilution effect of waters.The distributions of Hg contents in surface and bottom waters were reverse in case of the input and sedimentation of Hg was just beginning, yet were consistent when the input and sedimentation of Hg had been on-going for a time period. Finally, the mechanism of seasonal variation mechanism and terrestrial migration mechanism were proposed.