Long-Term and Seasonal Changes in Nutrients, Phytoplankton Biomass, and Dissolved Oxygen in Deep Bay, Hong Kong

Xu, Jie; Yin, Kedong; Lee, Joseph H.W.; Liu, Hongbin; Ho, Alvin Yam Tat; Yuan, Xiangcheng; Harrison, Paul J.

doi:10.1007/s12237-009-9213-5

Cited by 70 publications

(24 citation statements)

References 46 publications

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“…Deep Bay has suffered from extensive anthropogenic pollutants emitted by villages and livestock farms [31]. A recent evaluation indicated that the water quality of Deep Bay was the worst among all the waters of Hong Kong [32], posing threats to the sensitive associated ecosystems (wetland reserves) and oyster culturing in the bay [33,34]. As the area around Deep Bay shows high potential for further development, it is essential to understand the sediment conditions of the bay.…”

Section: Study Areamentioning

confidence: 99%

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Assessment of Total Suspended Sediment Distribution under Varying Tidal Conditions in Deep Bay: Initial Results from HJ-1A/1B Satellite CCD Images

et al. 2014

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Using Deep Bay in China as an example, an effective method for the retrieval of total suspended sediment (TSS) concentration using HJ-1A/1B satellite images is proposed. The factors driving the variation of the TSS spatial distribution are also discussed. Two field surveys, conducted on August 29 and October 26, 2012, showed that there was a strong linear relationship (R 2 = 0.9623) between field-surveyed OBS (optical backscatter) measurements (5-31NTU) and laboratory-analyzed TSS concentrations (9.89-35.58 mg/L). The COST image-based atmospheric correction procedure and the pseudo-invariant features (PIF) method were combined to remove the atmospheric effects from the total radiance measurements obtained with different CCDs onboard the HJ-1A/1B satellites. Then, a simple and practical retrieval model was established based on the relationship between the satellite-corrected reflectance band ratio of band 3 and band 2 (Rrs3/Rrs2) and in-situ TSS measurements. The R 2 of the regression relationship was 0.807, and the mean relative error (MRE) was 12.78%, as determined through in-situ data validation. Finally, the influences of tide cycles, wind factors (direction and speed) and other factors on the OPEN ACCESSRemote Sens. 2014, 6 9912 variation of the TSS spatial pattern observed from HJ-1A/1B satellite images from September through November of 2008 are discussed. The results show that HJ-1A/1B satellite CCD images can be used to estimate TSS concentrations under different tides in the study area over synoptic scales without using simultaneous in-situ atmospheric parameters and spectrum data. These findings provide strong informational support for numerical simulation studies on the combined influence of tide cycles and other associated hydrologic elements in Deep Bay.

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Section: Study Areamentioning

confidence: 99%

“…ρ f is the dimensionless air-water reflectance and is always in the range of 0.022-0.025 [34,39]. Here, ρ f is assumed to be 0.022 for a calm water surface.…”

Section: In-situ Datamentioning

confidence: 99%

Assessment of Total Suspended Sediment Distribution under Varying Tidal Conditions in Deep Bay: Initial Results from HJ-1A/1B Satellite CCD Images

et al. 2014

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“…, largely as NH 4 , to the inland delta of the SFE and to Suisun Bay (Jassby, 2008;his Elevated NH 4 from sewage effluent was implicated in depressed primary production along the California coast (MacIsaac et al, 1979), the Delaware Estuary (Yoshiyama and Sharp, 2006), the Scheldt Estuary (Cox et al, 2009), Wascana Creek, Canada (Waiser et al, 2010), and the inner bay of Hong Kong Harbor (Xu et al, 2010). At locations within the SFE, including Suisun Bay, elevated NH 4 has been linked to low chlorophyll, low rates of primary production and changes in phytoplankton community structure (Wilkerson et al, 2006;Dugdale et al, 2007;Glibert et al, 2011;Parker et al, 2012a,c).…”

mentioning

confidence: 99%

River flow and ammonium discharge determine spring phytoplankton blooms in an urbanized estuary

Dugdale

Wilkerson

Parker

et al. 2012

Estuarine, Coastal and Shelf Science

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“…The nutrient loadings into the East and South China Sea shelves have increased exponentially during the last two decades Xu et al, 2010), a trend that is likely to continue in the foreseeable future. As the mesotrophic area expands within the shelf, more and more DOC will be produced through elevating primary production ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Distinct bacterial-production–DOC–primary-production relationships and implications for biogenic C cycling in the South China Sea shelf

Lai

Liu

et al. 2014

Biogeosciences

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Abstract. Based on two summer spatio-temporal data sets obtained from the northern South China Sea shelf and basin, this study reveals contrasting relationships among bacterial production (BP), dissolved organic (DOC) and primary production (PP) in the transition zone from the neritic to the oceanic regions. Inside the mid-shelf (bottom depth < 100 m), where inorganic nutrient supplies from river discharge and internal waves were potentially abundant, BP, DOC and PP were positively intercorrelated, whereas these three measurements became uncorrelated in the oligotrophic outer shelf and slope. We suggest that the availability of limiting minerals could affect the couplings/decouplings between the source (i.e. phytoplankton) and sink (i.e. bacteria) of organic carbon, and thus DOC dynamics. DOC turnover times were homogeneously low (37-60 days) inside the midshelf area and then increased significantly to values > 100 days in the outer shelf, indicating that riverine (Pearl River) DOC might be more labile. The actual mechanism for this is unknown, but might relate to higher inorganic nutrient supply from river/terrestrial sources. The positive correlation of the BP / PP ratios vs. phosphate (and nitrate) concentrations in the inner shelf implies that if anthropogenic mineral loading keeps increasing in the foreseeable future, the near-shore zone may become more heterotrophic, rendering the system a stronger source of CO 2 .

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Long-Term and Seasonal Changes in Nutrients, Phytoplankton Biomass, and Dissolved Oxygen in Deep Bay, Hong Kong

Cited by 70 publications

References 46 publications

Assessment of Total Suspended Sediment Distribution under Varying Tidal Conditions in Deep Bay: Initial Results from HJ-1A/1B Satellite CCD Images

Assessment of Total Suspended Sediment Distribution under Varying Tidal Conditions in Deep Bay: Initial Results from HJ-1A/1B Satellite CCD Images

River flow and ammonium discharge determine spring phytoplankton blooms in an urbanized estuary

Distinct bacterial-production–DOC–primary-production relationships and implications for biogenic C cycling in the South China Sea shelf

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