Annual cycle of hypoxia off the Changjiang (Yangtze River) Estuary

Wang, Baodong; Wei, Qinsheng; Chen, Jianfang; Xie, Lian

doi:10.1016/j.marenvres.2011.12.007

Cited by 133 publications

(97 citation statements)

References 15 publications

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“…The hypoxia begins to develop in late spring and early summer, reaches its maximum in August, weakens in the autumn and finally disappears in the winter (Wang et al, 2012). The latitudinal location of the DO minimum can reach 27°N (Wang et al, 2012). The relatively high OP concentrations in the northern part of the studied area (north of 27°N) in spring did not occur in autumn (Fig.…”

Section: Relationships Between Summer Hypoxia and Seasonal Variationsmentioning

confidence: 82%

“…The hypoxia adjacent to the Changjiang Estuary, which is one of the largest coastal low-oxygen areas in the world , always occurs in summer and its zone has increased in recent decades (Rabouille et al, 2008;Wang, 2009). Wang et al (2012) also noted that the increasing trend of hypoxia would continue in next two decades. The primary production in the coastal zone influenced by the Changjiang ranges from 1.5 to 4.5 g C m −2 d −1 (Chen et al, 2004) during summer.…”

Section: Study Site and Sample Collectionmentioning

confidence: 99%

“…Wang et al (2012) reported the annual cycle of hypoxia off the Changjiang Estuary. The hypoxia begins to develop in late spring and early summer, reaches its maximum in August, weakens in the autumn and finally disappears in the winter (Wang et al, 2012). The latitudinal location of the DO minimum can reach 27°N (Wang et al, 2012).…”

Section: Relationships Between Summer Hypoxia and Seasonal Variationsmentioning

confidence: 99%

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Geochemical forms and seasonal variations of phosphorus in surface sediments of the East China Sea shelf

Zhou

Gao

Yuan

et al. 2016

Journal of Marine Systems

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Geochemical characteristics of phosphorus (P) in the surface sediments of the East China Sea shelf (ECSS) were studied in spring and autumn, 2014. Distributions, seasonal variations, transformations and their influencing factors were discussed. Besides, burial fluxes of P in different seasons were also calculated. Five operationally defined forms of P, namely exchangeable or loosely sorbed P (Ads-P), iron-bound P (Fe-P), authigenic P (Au-P), detrital apatite plus other inorganic P (De-P) and organic P (OP), were obtained using a sequential extraction procedure. Generally, the concentrations of Ads-P, Fe-P, Au-P and OP decreased seaward and the concentrations of De-P increased seaward in both seasons. In spring, the average concentrations of Ads-P, Fe-P, Au-P, De-P and OP were 13.8 ± 5.0, 21.9 ± 7.6, 148.5 ± 44.5, 153.1 ± 55.8 and 91.7 ± 21.5 μg g −1 , respectively. The corresponding concentrations in autumn were 11.4 ± 4.3, 20.0 ± 10.9, 170.4 ± 53.6, 225.6 ± 101.7 and 77.1 ± 33.9 μg g −1 , respectively. The average percentages of P fractions in total P (TP) in spring and autumn were both in the order: De-P N Au-P N OP N Fe-P N Ads-P. The average concentrations of Bio-available P (Bio-P) were 127.4 ± 31.4 μg g −1 in spring and 108.5 ± 47.2 μg g −1 in autumn, accounting for 29.8% ± 7.3% and 21.5% ± 8.2% of corresponding TP, respectively. Seasonal variations of the primary production, hydrodynamic conditions, hypoxia and other environmental conditions were responsible for the seasonal variations of different phosphorus forms. The calculation of burial fluxes reflected that, in most parts of the studied area, TP had relative high burial fluxes in autumn, while Bio-P had relatively high burial fluxes in spring. The burial fluxes of other phosphorus forms also showed different seasonal variations in different parts of the studied area.

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Section: Relationships Between Summer Hypoxia and Seasonal Variationsmentioning

confidence: 82%

Section: Study Site and Sample Collectionmentioning

confidence: 99%

Section: Relationships Between Summer Hypoxia and Seasonal Variationsmentioning

confidence: 99%

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Geochemical forms and seasonal variations of phosphorus in surface sediments of the East China Sea shelf

Zhou

Gao

Yuan

et al. 2016

Journal of Marine Systems

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“…1 shows the location of DH33 and KP04 in the offshore areas of the Zhejiang and Fujian coast, with relatively minimal human disturbance. Sediment core DH33 was collected in a hypoxic zone (Wang et al, 2012) (123 35.059 0 E, 29 16.964 0 N) close to the Yangtze River estuary, where the sediment is silt-dominated and influenced by the Taiwan Fig. 1.…”

Section: Sample Collectionmentioning

confidence: 99%

Major sources of MeO/OH-BDEs in the East China Sea elucidated from their records and phytoplankton biomarkers

Fan

Huh

Lan

et al. 2014

Environmental Pollution

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“…From the 1960s to the 1990s, Wang (2006) found a 5-fold increase in input of dissolved inorganic nitrogen from the Yangtze River causing adverse changes to the ECS ecosystem, including harmful algal blooms. Cultural eutrophication and hypoxia, in particular excessive growth of algae, are the responses to increasing nutrient discharge to the water body (Chen et al 2007;Rabouille et al 2008;Chou et al 2009;Cai et al 2011;Wang et al 2012). In addition, the construction of the Three-Gorges Dam might also have caused a reduction of freshwater input and changes in sediment flux, resulting in a shift of phytoplankton composition and a shrinking of primary production in the ECS (Gong et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Mixing control on the photosynthesis-irradiance relationship and an estimate of primary production in the winter of the East China Sea

Gong¹,

Chen²,

You³

2017

Terr. Atmos. Ocean. Sci.

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The response of marine phytoplankton primary productivity to available light (photosynthesis-irradiance relationship, P B -E curve) is the principle physiology of plant that is particularly important in the estimation of primary production and in physicalbiogeochemical modeling. In this study, we conducted on-board incubation experiments to examine photosynthesis-irradiance relationships in samples collected from the subtropical shelf of the East China Sea during a winter cruise. Depth and spatial variation of the maximum photosynthesis rate normalized to chlorophyll a ( P m B ) and the initial slope (α) of the P B -E curve parameters were insignificant in the East China Sea. The vertical homogeneity was due to the strong winter mixing. However, spatial homogeneity could be possibly caused by different factors. With relatively low solar radiation in the winter, strong vertical mixing deteriorated light dose and may lead to homogeneously low photosynthetic parameters. In addition, differential inhibitions by temperature and nutrient availability may potentially cause the spatial homogeneity.The mean values of P m B and α were 2.82 ± 0.50 gC (gChl) -1 h -1 and 0.010 ± 0.002 gC (gChl) -1 h -1 (μmol photons m -2 s -1 ) -1 , respectively. Using the photosynthetic-irradiance model (P B -E curve model), the estimated value of shelf-averaged euphotic zone integrated primary production was 186 ± 117 mgC m -2 d -1 . With an overestimate of satellite-derived primary production, field observations will be required.

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Annual cycle of hypoxia off the Changjiang (Yangtze River) Estuary

Cited by 133 publications

References 15 publications

Geochemical forms and seasonal variations of phosphorus in surface sediments of the East China Sea shelf

Geochemical forms and seasonal variations of phosphorus in surface sediments of the East China Sea shelf

Major sources of MeO/OH-BDEs in the East China Sea elucidated from their records and phytoplankton biomarkers

Mixing control on the photosynthesis-irradiance relationship and an estimate of primary production in the winter of the East China Sea

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