The distribution of zinc and reactive silicate in the Otago Harbour, New Zealand |
| |
| Authors: | Keith A Hunter Simon R Tyler |
| |
| Abstract: | The horizontal distributions of reactive silicate and zinc in the Otago Harbour, New Zealand, a shallow, vertically well-mixed estuary, have been compared. Within the harbour silicate displayed a linear salinity profile on two sampling occasions in October and early November. Consideration of the silicate budget suggested some removal of freshwater silicate in the headwaters of the estuary. Zinc concentrations, measured using state-of-the-art clean laboratory techniques were orders of magnitude lower than previously published data for coastal waters. Typical values of 5–20 ng l−1 Zn were recorded in the seaward endmember. Zinc-salinity profiles were approximately linear. Relationships between zinc and silicate concentrations for the estuarine and freshwater samples suggest a coupling between the rates of supply of these elements to the ocean and their utilisation by plankton. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
