Yunjie Wu

Influence of rising tide and falling tide on settling process of Cd in Jiaozhou Bay

Settling is one of the important transporting processes of pollutants in marine bay. Based on the analysis on the distributions of Cd in bottom waters in Jiaozhou Bay 1988, this paper defined the settling process. Results showed that Cd contents in bottom waters in Jiaozhou Bay in April and July 1988 were 0.08-0.10 μg L and 0.09-0.61 μg L, respectively, indicated that the pollution level of Cd in bottom waters in this bay was still very slight in 1988. By means of vertical water’s effect, there were high settling regions from the bay mouth to the bay center in April 1988, and there were high settling regions in the inner side of the bay mouth in July 1988. By means of rising tide and falling tide, Cd from different sources was settling the moving path, resulting in high settling regions along with the moving path. As a result, during the settling process of Cd, drifting phenomenon was occurring.

A review on the sources and spatial-temporal distributions of Pb in Jiaozhou Bay

Abstract This paper provided a review on the source, spatial-distribution, temporal variations of Pb in Jiaozhou Bay based on investigation of Pb in surface and waters in different seasons during 1979-1983. The source strengths of Pb sources in Jiaozhou Bay were showing increasing trends, and the pollution level of Pb in this bay was slight or moderate in the early stage of reform and opening-up. Pb contents in the marine bay were mainly determined by the strength and frequency of Pb inputs from human activities, and Pb could be moving from high content areas to low content areas in the ocean interior. Surface waters in the ocean was polluted by human activities, and bottom waters was polluted by means of vertical water’s effect. The process of spatial distribution of Pb in waters was including three steps, i.e., 1), Pb was transferring to surface waters in the bay, 2) Pb was transferring to surface waters, and 3) Pb was transferring to and accumulating in bottom waters.

A research on the vertical migration process and background value of cyanide in Jiaozhou Bay

We analyzed the seasonal variation, horizontal distribution, vertical distribution and background value of cyanide in the bay mouth of Jiaozhou Bay in 1983. Cyanide contents in the bay mouth were changing a lot by means of vertical water’s effect. Cyanide contents in both surface and bottom waters were in orders of summer > autumn > spring. At spatial scale, the horizontal distributions of cyanide in different seasons were consistent, and were decreasing from the inside of the bay mouth to the bay mouth and then the ouside of the bay mouth. At variation scale, the variation ranges of cyanide contents in boto surface and bottom waters were consistent. At vertical scale, the horizontal distributions of cyanide in surface and bottom waters were consistent in case of high cyanide contents, yet were closed in case of low cyanide contents. At region scale, the differences of cyanide contents in surface and bottom waters were determined bay the inputs of cyanide. The seasonal variations and spatial distributions of cyanide were revealing the horizontal water’s effect and vertical water’s effect. The background values of cyanide in the bay were 0.02-0.22 μg L.

Vertical variation and migration of Pb in Jiaozhou Bay waters

Based on the investigation data on Pb in waters in 1984, were analyzed the horizontal distribution, seasonal variation and settling process of Pb in water in the bay mouth of Jiaozhou Bay, eastern China. Results showed that the seasonal variations of Pb contents in surface waters and bottom waters were consist, and were in order of summer > autumn. In spatial scale, the migration and sedimentation distances of Pb were determined bay Pb contents in waters, and the spatial sedimentaion processes could be revealed by the horizontal distributions of Pb. In vertical scale, Pb contents in surface and bottom waters were closed in cased of low Pb contents in waters, while in case of high Pb contents in waters the differences of Pb contents in surface and bottom waters were relative high. In generally, the seasonal variations and vertical distributions of Pb in waters were indicating the horizontal water’s effect and vetical water’s effect, and were reveal the horizontal migration and horizontal sedimentation processes of Pb.

A research on the vertical transfer process of Cu in Jiaozhou Bay

Based on the investigation data on Cu in surface and bottom waters in the bay mouth of Jiaozhou Bay in 1983, this paper analyzed the seasonal variations, vertical variations and horizontal distributions of Cu. Cu contents in surface waters in the bay mouth of Jiaozhou Bay in May, September and October 1983 were ranged from 2.47-20.60 μg L -1 , 1.28-4.86 μg L -1 and 0.77-2.28 μg L -1 , and were in order of spring > summer >autumn; while for bottom waters were ranged from 0.86-3.95 μg L -1 , 1.31-1.90 μg L -1 and 0.24-2.00 μg L -1 , and were in order of spring >autumn >summer. The horizontal distributions of Cu in surface and bottom waters were consistent in May and October, while in September were reverse. At Spatial scale, Cu contents in both surface and bottom waters were tending to be decreasing. Once the input of the sources were stop, Cu contents in surface waters were increasing, yet in bottom waters were still decreasing. As time pass by, Cu contents in bottom waters were increasing along with the increasing of Cu contents in surface waters.

Influence of ocean current on Hg content in the bay mouth of Jiaozhou Bay

Jiaozhou Bay is a semi-closed bay located in Shandong Province, eastern China. Based on investigation data on distribution of Hg content in surface and bottom waters in May 1983, April and October 1985, this paper analyzed the influence of ocean current on Hg content in the bay mouth. Results showed that In case of Hg content in both surface and bottom waters was relative low, low Hg content areas were occurring the both surface and bottom waters in the bay mouth. In case of Hg content was relative high in surface waters, there were a serious of low value centers in the bay mouth, and were decreasing gradiently from the outer to the low value center. In generally, the decreasing degree was determined by the flow rate, and therefore the Hg content could be used as tracer for revealing the flow rate of and transportation strength of ocean current.