Influence of river discharge and phytoplankton on the distribution of nutrients and trace metals in Razdolnaya River estuary, Russia

Shulkin, V. M.; Tishchenko, P. Ya.; Semkin, P. Yu.; Shvetsova, M. G.

doi:10.1016/j.ecss.2017.09.024

Cited by 20 publications

(15 citation statements)

References 37 publications

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“…The DIN level in this area was lower than that in the Tweed estuary (Uncles et al, 2003). However, the nutrient concentration in the PRE was still much higher than that in the Yellow River estuary (Wang et al, 2017), the Cochin estuary (Vipindas et al, 2018;Jabir et al, 2020), the Tagus River estuary (Borges et al, 2020), the Caete estuary (Monteiro et al, 2016), and the Razdolnaya River estuary (Shulkin et al, 2018).…”

Section: Nutrient Enrichment In An Estuarine Environmentmentioning

confidence: 70%

“…The DIP was at a comparable level. The DSi concentration in this estuary was lower than that in the Yangtze River estuary (Chai et al, 2006), but higher than that in the Yellow River estuary (Wang et al, 2017), the Tagus River estuary (Borges et al, 2020), the Razdolnaya River estuary (Shulkin et al, 2018), and the Tweed estuary (Uncles et al, 2003). Therefore, the water quality pollution caused by nitrogen and phosphorus species should be primarily concerned with avoiding more deterioration in the PRE ecosystems.…”

Section: Nutrient Enrichment In An Estuarine Environmentmentioning

confidence: 85%

“…The riverine inputs have provided enriched nutrient resources for the marine microorganisms. Considering the mixing degree of freshwater and seawater, the nutrient-salinity relationships also reflected the source and sink patterns besides the dilution process (Shulkin et al, 2018;Kim et al, 2020). Changes in nutrient concentrations were then considerably modulated by biological uptake processes associated with the physical mixing.…”

Section: Effect Of the Pearl River Dischargementioning

confidence: 99%

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Nutrient Pollution and Its Dynamic Source-Sink Pattern in the Pearl River Estuary (South China)

Tao¹,

Niu²,

Dong³

et al. 2021

Front. Mar. Sci.

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Nutrient enrichment and its quantitative cause-effect chains of the biogeochemical processes have scarcely been documented in the Pearl River Estuary (South China). Field investigations of nutrient samples taken between 1996 and 2018 showed significant differences in nitrogen and phosphorus with times and sites. The concentrations of DIN and DIP gradually increased over the past two decades, with good fitted linear curves (R2 = 0.31 for DIN, R2 = 0.92 for DIP); while the temporal variation in DSi was non-significant. Higher levels of nitrogen and silicate mainly appeared in the upper estuary because of the riverine influence. The phosphorus pollution was accumulated in the northeast (e.g., Shenzhen bay). The aquatic environment was highly sensitive to nutrient pollution and eutrophication risk, which accordingly corresponded to high phytoplankton production and biodiversity. Phosphorus was the limiting factor of phytoplankton growth in this estuary, and more frequently caused the eutrophication risks and blooms. The nutrient pollution was largely influenced by riverine inputs, quantified by PCA-generation, and the contributions of coastal emission and atmospheric deposition were followed. The two-end member mixing model differentiated the physical alterations from the biological activity and identified the dynamic source-sink patterns of nutrient species. Nitrogen and silicate had relatively conservative behaviors in the estuary and phosphate showed an active pattern.

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Section: Nutrient Enrichment In An Estuarine Environmentmentioning

confidence: 70%

Section: Nutrient Enrichment In An Estuarine Environmentmentioning

confidence: 85%

Section: Effect Of the Pearl River Dischargementioning

confidence: 99%

See 1 more Smart Citation

Nutrient Pollution and Its Dynamic Source-Sink Pattern in the Pearl River Estuary (South China)

Tao¹,

Niu²,

Dong³

et al. 2021

Front. Mar. Sci.

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“…(1) a central area of the Amursky Bay, where hypoxia was observed in August 2007 [15,18]; (2) the Far East Marine Biosphere Reserve (Posyet Bay), where hypoxia was discovered in August 2013 [15,27]; (3) an internal part of the Razdolnaya River estuary, where hypoxia was observed in October 2014 [28]; and (4) an internal part of the Tumannaya River estuary, where hypoxia was observed in May 2015 [29]. The Tumannaya and Razdolnaya Rivers are transboundary rivers that originate in China.…”

Section: Resultsmentioning

confidence: 99%

Acidification and Deoxygenation of the Northwestern Japan/East Sea

Tishchenko

Лобанов

Kaplunenko

et al. 2021

JMSE

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Seasonal hypoxia in the bottom waters of the Peter the Great Bay (PGB) of the Japan/East Sea (JES) occurs in summer. Using the empirical relationship between dissolved oxygen (DO) and pH obtained for hypoxic conditions and available historical DO data, acidification rates were estimated. Carefully sampled time-series observations from the northwestern part of the JES, carried out from 1999 to 2014 along the 132°20′ E and 134°00′ E longitudes, were chosen to determine the interannual variability of the sea’s hydrochemical parameters (DO, pH, and TA—the total alkalinity phosphates, nitrate, and silicates). To limit the effects of seasonal and spatial variability, only data obtained in the warm period were used. Additionally, all data from depths shallower than 500 m were discarded because they are affected by high natural variability, mostly due to strong mesoscale dynamic structures. Our results demonstrated that the pH and DO concentrations measured in the Upper Japan Sea Proper Water (750 m), Lower Japan Sea Proper Water (1250, 1750, 2250 m), and Bottom Water (3000 m) have been decreasing in recent years. On the other hand, calculated normalized dissolved inorganic carbon (NDIC), CO2 partial pressure (pCO2), and measured nutrient concentrations have been increasing. Maximum rates of acidification and deoxygenation are occurring at around 750 m. The annual rate of increase of pCO2 in the water exceeds the atmospheric rate more than 2-fold at a depth of 750 m. The observed variability of the hydrochemical properties can be explained by the combination of the slowdown ventilation of the vertical water column and eutrophication. However, the results obtained here are valid for the subpolar region of the JES, not for the whole sea. The synchronization of the deoxygenation of the open part of the JES and PGB has been found.

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“…This can be attributed to changes in hydrological and biogeochemical conditions due to summer river flood. With increasing river discharge, an increased concentration of trace metals in many rivers, including rivers of the Northwestern Sea of Japan, was observed [ 37 , 38 ]. Some trace metals enhance the photodegradation of 3-ring PAHs several times in relation to LMW PAHs or they inhibit the photodegradation of HMW PAHs [ 39 , 40 ].…”

Section: Resultsmentioning

confidence: 99%

Polycyclic Aromatic Hydrocarbons in the Estuaries of Two Rivers of the Sea of Japan

Chizhova

Koudryashova

Prokuda

et al. 2020

IJERPH

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The seasonal polycyclic aromatic hydrocarbon (PAH) variability was studied in the estuaries of the Partizanskaya River and the Tumen River, the largest transboundary river of the Sea of Japan. The PAH levels were generally low over the year; however, the PAH concentrations increased according to one of two seasonal trends, which were either an increase in PAHs during the cold period, influenced by heating, or a PAH enrichment during the wet period due to higher run-off inputs. The major PAH source was the combustion of fossil fuels and biomass, but a minor input of petrogenic PAHs in some seasons was observed. Higher PAH concentrations were observed in fresh and brackish water compared to the saline waters in the Tumen River estuary, while the PAH concentrations in both types of water were similar in the Partizanskaya River estuary, suggesting different pathways of PAH input into the estuaries. The annual riverine PAH mass flux amounted to 0.028 t/year and 2.5 t/year for the Partizanskaya River and the Tumen River, respectively. The riverine PAH contribution to the coastal water of the Sea of Japan depends on the river discharge rather than the PAH level in the river water.

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Influence of river discharge and phytoplankton on the distribution of nutrients and trace metals in Razdolnaya River estuary, Russia

Cited by 20 publications

References 37 publications

Nutrient Pollution and Its Dynamic Source-Sink Pattern in the Pearl River Estuary (South China)

Nutrient Pollution and Its Dynamic Source-Sink Pattern in the Pearl River Estuary (South China)

Acidification and Deoxygenation of the Northwestern Japan/East Sea

Polycyclic Aromatic Hydrocarbons in the Estuaries of Two Rivers of the Sea of Japan

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