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Comparison and Analysis of Two Dissolved Oxygen Reduction Events in the Dapeng Bay
Pages: 24-28
Year: Issue:  2
Journal: Ocean Technology

Keyword:  dissolved oxygenDapeng BayNan’ao;
Abstract: Two dissolved oxygen reduction events occurred in the Dapeng Bay of Shenzhen on August 16~17 and September 13 ~15, respectively. Buoy parameters related to these events are analyzed in this paper, including dissolved oxygen(DO), pH, Chlorophyll-a, water temperature, salinity and wind speed. It is discovered that, with the decrease of dissolved oxygen, water temperature and salinity decreased in both the two events. Due to the impact of the Typhoon "Kai Tak", the wind speed rose to over 20 m/s in the August event, compared with no significant increase in wind speed in the September event. Through data analysis, it is found that the August event was mainly attributed to the typhoon’s winds which brought sea sediments to the surface, and the organic matters in the sediments rapidly consumed the dissolved oxygen in the surface layer, leading to dissolved oxygen reduction to about 1 mg/L. The reason for the September event was not clear, which may be attributed to the influence of seawater mass.
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