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| Temporal and spatial distributions and sources of particulate organic matter in the Shenzhen Bay and adjacent coastal waters from 2000 to 2011 |
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Abstract Based on the data obtained from monthly cruises from 2000 to 2011, temporal and spatial distribution of the particulate organic matter (POM) concentration in Shenzhen Bay and the coastal eastern Lingdingyang Estuary were discussed. Sources and residence time of POM were also investigated by combining measurements of the salinity with chlorophyll a (Chl a). The results showed that POM concentration and terrestrial fraction were about 4.2mg/L and 79% in Shenzhen Bay, and about 1.9mg/L and 42% in the coastal eastern Lingdingyang Estuary respectively. The ratios of the phytoplankton POM (PPOM):Chl a were about 92 and 54g/g, based on which the PPOM concentrations were estimated at about 0.8 and 0.2mg/L, in Shenzhen Bay and the coastal eastern Lingdingyang Estuary respectively. On the basis of the phytoplankton productivity and integrated marine POM, the POM residence time was estimated to be from 1~5 days in the Shenzhen Bay and about 10days in the coastal eastern Lingdingyang Estuary. The POM concentration increased slightly from 1.7 to 2.0mg/L in the coastal eastern Lingdingyang Estuary in the period 2000~2011, while increased from 3.0 to 5.5mg/L in the period 2000~2005 and decreased from 5.4 to 3.0mg/L in the period 2006~2011 in the Shenzhen Bay.
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Received: 13 March 2014
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