Influence of suspended sediment front on nutrients and phytoplankton dynamics off the Changjiang Estuary: A FVCOM-ERSEM coupled model experiment

Ge, Jianzhong; Torres, Ricardo; Chen, Changsheng; Liu, Jie; Xu, Y. Jun; Bellerby, R. G. J.; Shen, Fang; Bruggeman, Jorn; Ding, Pingxing

doi:10.1016/j.jmarsys.2019.103292

Cited by 66 publications

(50 citation statements)

References 75 publications

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“…The root-mean-square difference for nitrate was <20 μM for all years combined (Figure 5c) and 0.5 μM for phosphate (Figure 5d). More validation results could also be found at Ge et al (2020).…”

Section: Overall Quantification Of Modeling Resultsmentioning

confidence: 93%

“…This fraction could be up to ~80% when SPM ~ 1,000 mg/L (Middelburg & Herman, ). The background SPM of river mouth is ~400 mg/L (Ge et al, ; Ge, Shen, et al, ), suggesting that the nutrient‐absorbed nutrients could be a significant fraction (Xu et al, ). Additionally, the sediment‐induced nutrient absorption/desorption is a rapid process (Fitzsimons et al, ).…”

Section: Variability In Physical Processes and Nutrientsmentioning

confidence: 99%

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Interannual Variabilities of Nutrients and Phytoplankton off the Changjiang Estuary in Response to Changing River Inputs

Shi

Liu

et al. 2020

JGR Oceans

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Coastal ecosystems are strongly influenced by terrestrial inputs of freshwater, sediments, and nutrients, particularly in a megariver estuary of the Changjiang River. A remarkable increase in nutrient loading from the Changjiang River to the shelf has been observed over the period from 1999 to 2016 and turned the region into a high eutrophication condition. The Finite‐Volume Community Ocean Model and the European Regional Seas Ecosystem Model were coupled to assess the impact of the nutrient loading on the interannual variability of nutrients and phytoplankton. The model was first validated via observational data, and then dynamical analysis were conducted. Singular vector decomposition analysis indicated that the rapid change of local ecosystem was highly correlated with the change in river nutrient contributions. The Changjiang estuarine ecosystem was phosphate limited. The phosphate exhibited local variation, while the abundant nitrate from the river was diluted by the low‐nitrate oceanic water. The suspended sediment was significantly correlated with phytoplankton but not with nutrients. The ratio of diatom biomass to dinoflagellate biomass respected a rapid response to strong oscillations in the river nutrient input. High diatom primary production occurred near the sediment front, whereas the dinoflagellate bloom extended significantly offshore. The spring diatom and dinoflagellate blooms had major peaks in the empirical orthogonal function Modes 1 and 2, and the autumn bloom is characterized by secondary peaks from Mode 2 in the autumn.

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Section: Overall Quantification Of Modeling Resultsmentioning

confidence: 93%

Section: Variability In Physical Processes and Nutrientsmentioning

confidence: 99%

Interannual Variabilities of Nutrients and Phytoplankton off the Changjiang Estuary in Response to Changing River Inputs

Shi

Liu

et al. 2020

JGR Oceans

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“…The effect of SPM on the phytoplankton dynamics and bloom events, probably due to sunlight sheltering, has been emphasized by Ge, Torres, et al. (2020).…”

Section: Discussionmentioning

confidence: 94%

“…The above comparisons suggest that the higher SPM contents in July 2016, which were probably the result of the flood event occurring in the river basin, might be the best explanation for depressed nutrient variation rates in seawater. The effect of SPM on the phytoplankton dynamics and bloom events, probably due to sunlight sheltering, has been emphasized by Ge, Torres, et al (2020).…”

Section: Comparison Among Cruisesmentioning

confidence: 99%

New Insights Into the Non‐Conservative Behaviors of Nutrients Triggering Phytoplankton Blooms in the Changjiang (Yangtze) River Estuary

Wang

Gao

2022

JGR Oceans

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Four research cruises were carried out during March and July in 2015 and 2016 in the Changjiang (Yangtze) River Estuary and the adjacent shelf. Nutrient concentrations (regarded as static parameters) were measured in the surface and bottom waters collected at 86–99 stations over the course of these cruises. In addition, unfiltered seawater samples were incubated onboard for 48 hr to measure the potential change rates of nutrients (regarded as dynamic parameters). These parameters can help directly elucidate non‐conservative behaviors of nutrients in order to determine whether seawater serves as a source or a sink. Large nutrient sinks (with more negative variation rates) were consistently found at the surface during the two July cruises at the stations just along the outside edge of the turbidity maximum zone near the mouth of the river. Negative rates, although with much smaller magnitudes, were also found in most bottom water samples in July and at both the surface and bottom in March. The high net nutrient uptake rates at the surface in the summer triggered bloom events later at the seaward stations, showing that high net nutrient uptake is the cause and high chlorophyll‐a is the consequence of the bloom. Such information about biogeochemical cycling of nutrients and the mechanisms and development of bloom events occurring in large river estuarine and coastal areas could not have been obtained if these static and dynamic parameters had not been studied together.

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“…This fraction could be up to ~80% when SPM ~1,000 mg/L (Middelburg & Herman, 2007). The background SPM of river mouth is ~400 mg/L (Ge et al, 2020;Ge, Shen, et al, 2015), suggesting that the nutrient-absorbed nutrients could be a significant fraction (Xu et al, 2013). Additionally, the sediment-10.1029/2019JC015595…”

Section: Effect Of Sediment On Nutrients and Chl A Variabilitymentioning

confidence: 99%

Interannual variabilities of nutrients and phytoplankton off the Changjiang Estuary in response to changing river inputs

Ge¹,

Shi²,

Chen³

et al. 2020

Preprint

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<p>Coastal ecosystems are strongly influenced by terrestrial and oceanic inputs of water, sediment and nutrients. Terrestrial nutrients in freshwater discharge are particularly important for mega-river estuaries. A remarkable increase in nutrient loads transported from the Changjiang River through the estuary to the shelf has been observed from 1999 to 2016. The Finite-Volume Community Ocean Model and the European Regional Seas Ecosystem Model were coupled to assess the interannual variability of nutrients and phytoplankton under these flux dynamics. The system exhibited a rapid ecosystem response to the changing river nutrient contribution. Singular vector decomposition (SVD) analysis demonstratedthat abundant nitrate from the river was diluted by low-nitrate water transported from the oceanic domain. In contrast, phosphate exhibited local variation, suggesting the estuarine ecosystem was phosphate-limited. The SVD results showed that there were no significant correlations between the suspended sediment and nutrients, but a significant correlation between sediment and phytoplankton. The nutrient structure of the river discharge resulted in the dominance of non-diatom species in the phytoplankton bloom from spring to autumn. The ratio of diatom and dinoflagellate populations showed a rapid feedback response to the strong oscillations in river nutrient input. High diatom primary production occurred near the sediment front, whereas dinoflagellate bloom extended significantly offshore. Both diatoms and dinoflagellates had major peaks representing spring blooms from empirical orthogonal function Mode 1 and 2, and secondary peaks from Mode 2 in the autumn, which coincided with the autumn bloom.</p>

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Influence of suspended sediment front on nutrients and phytoplankton dynamics off the Changjiang Estuary: A FVCOM-ERSEM coupled model experiment

Cited by 66 publications

References 75 publications

Interannual Variabilities of Nutrients and Phytoplankton off the Changjiang Estuary in Response to Changing River Inputs

Interannual Variabilities of Nutrients and Phytoplankton off the Changjiang Estuary in Response to Changing River Inputs

New Insights Into the Non‐Conservative Behaviors of Nutrients Triggering Phytoplankton Blooms in the Changjiang (Yangtze) River Estuary

Interannual variabilities of nutrients and phytoplankton off the Changjiang Estuary in response to changing river inputs

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