Surface Distribution and Sources of Pb content in the ocean current of Jiaozhou Bay

Abstract

Abstract According to the data on the investigation of Jiaozhou Bay in May, August and October, 1992, the Pb content and the horizontal distribution in the surface of Jiaozhou Bay were studied. The results show that in May, in the waters of Jiaozhou Bay, there were three Pb high content sources - open ocean current, ships and wharf, and Licun River. The open ocean current entered Jiaozhou Bay from the bay outside into the bay inside through the bay mouth with a high content of Pb. The Pb content in the mouth of the bay was 20.79 μg/L. In the bay, the ocean current moved forward the shore of the northeast and reached southeast waters of the bay, transporting 5.54 μg/L Pb content. Then, the ocean current continued to move along the nearshore to the northeast and reached the eastern nearshore waters of Jiaozhou Bay. Here, Pb content was transported via ships and wharf and was 16.34 μg/L. After that, the ocean current continued to move along the nearshore to the northeast and reached the waters in the northeast of the bay, with the Pb content 7.09 μg/L. The ocean current continued to move along the nearshore to the northeast and got the coastal waters near the mouth of the Licun River. Here, Pb content was transported via the Licun River and the Pb content was 37.90 μg/L. Afterwards, the ocean current continued to move along the shore to the northeast and reached the waters in the northeast of the bay, carrying 18.27 μg/L Pb content. Then, the ocean current turned westward along the near-shore direction and got the northern waters of the bay, where the Pb content transported via ocean current was 13.72 μg/L. The ocean current continued to run along the shore to the west and got to the westernmost waters in the northwest of the bay. The Pb content transported via the ocean current was 12.84 μg/L. After that, the ocean current turned southward along the near-shore and reached the waters in the southwest of the bay transporting 8.62 μg/L Pb content. At this moment, a low Pb content area of 7.37 μg/L appeared in the central waters of Jiaozhou Bay.