The Temporal and Spatial Shift of Vertical Quantity and Source of the PHC Content

Abstract

Abstract According to the investigation data of PHC in Jiaozhou Bay in May, August and October, 1992, this article shows the source of PHC content in both surface and bottom of Jiaozhou Bay and the temporal and spatial shift of vertical content by comparing the horizontal and vertical changes of PHC content and the PHC content in the surface and bottom. Consequently, in May, August and October, the results from subtracting PHC content in surface and bottom was between -0.004 – 0.028 mg/L, which indicated that the PHC content in both surface and bottom was close. In May, the difference of PHC content between the surface and bottom was -0.004 – -0.020 mg/L, both were negative, in the central and estuary waters of Jiaozhou Bay. In August, the difference of PHC content between surface and bottom layer of all stations in Jiaozhou Bay was 0.007–0.021 mg/L, which was positive. In October, the difference of PHC content between the surface and bottom layer of all stations in Jiaozhou Bay was 0.010–0.028 mg/L, which was positive. On the spatial scale, with the PHC content far away from the source, there are spatial changes of PHC content. In the center of the Bay and the northern part of the bay mouth, the PHC content of the surface layer is less than that of the bottom layer. In August and October, the difference of surface and bottom layer contents of all stations in Jiaozhou Bay was positive, showing that the PHC content of surface layer was higher than that of bottom layer. On the temporal scale, with the change of time, the source of PHC content underwent changes, showing the temporal changes of PHC content in surface and bottom. From May to August, the source of PHC content in the transportation changed. And the PHC content in the surface layer and the bottom layer in the transportation decreased. From August to October, the source of PHC content in the conveying system changed further with more PHC content in the surface layer and in the bottom layer.