2000~2011年深圳湾及邻近水域颗粒有机物的来源和时空分布

依据2000~2011年每月一次的调查资料,简要描述和讨论了深圳湾及邻近水域中颗粒有机物(POM)质量浓度的时空分布,并结合盐度和叶绿素a (Chl a)实测数据探讨POM的来源和滞留时间.结果表明深圳湾的POM质量浓度和陆源质量分数分别约为4.2mg/L,79%,而伶仃洋东部沿岸的分别约为1.9mg/L,42%.深圳湾和伶仃洋东部沿岸中现存浮游植物颗粒有机物(PPOM):Chl a比率分别约为92,54g/g,由此估算的PPOM质量浓度分别为0.8,0.2mg/L左右.依据浮游植物生产力和累计海源POM估算的POM滞留时间在深圳湾中为1~5d,而在伶仃洋东部沿岸中约为10d.研究期间伶仃洋东部沿岸POM质量浓度的年际变化略呈上升趋势,从1.7mg/L上升至2.0mg/L;深圳湾POM质量浓度在2000~2005年呈上升趋势,从3.0mg/L上升至5.5mg/L,在2006~2011年则呈下降趋势,从5.4mg/L下降至3.0mg/L.

Temporal and spatial distributions and sources of particulate organic matter in the Shenzhen Bay and adjacent coastal waters from 2000 to 2011

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.