Reduction of primary production and changing of nutrient ratio in the East China Sea: Effect of the Three Gorges Dam?

Gong, Gwo‐Ching; Chang, Jeng Kuei; Chiang, Kuo‐Ping; Hsiung, Tung-Ming; Hung, Chin‐Chang; Duan, Shuiwang; Codispoti, Louis A

doi:10.1029/2006gl025800

Cited by 216 publications

(156 citation statements)

References 20 publications

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“…However, the distribution of lower SSS near multiple leading edges of the CDW plume extension did not always correspond to high Chl a. In other words, this result (i.e., low Chl a in the low SSS CDW plume) implies that the presence of terrestrial CDOM within the CDW can lead to overestimation of satellite-derived Chl a values, as suggested by previous studies (e.g., Gong et al 2006). …”

Section: Satellite-derived Acdom Datamentioning

confidence: 49%

“…Prior to the work reported herein, the principal satellitederived observations of the CDW were based on chlorophyll concentration (Kiyomoto et al 2001;Yuan et al 2005;Gong et al 2006;Kim et al 2009;Shi and Wang 2012). These studies showed that the CDW has profound effects on the physical and biological processes that occur on the ECS shelf.…”

Section: Introductionmentioning

confidence: 99%

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Unique Dispersal of the Changjiang-Diluted Water Plume in the East China Sea Revealed from Satellite Monitoring of Colored Dissolved Organic Matter (CDOM)

Sasaki¹,

Gomi²,

Asai³

et al. 2014

Terr. Atmos. Ocean. Sci.

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The optical properties of colored dissolved organic matter (CDOM) in the Changjiang (Yangtze River) plume water were investigated during the summer of 2009 and 2010. The absorption coefficient of CDOM at 325 nm (aCDOM) increased inversely with decreasing sea-surface salinity (SSS), implying that aCDOM can be used as a natural tracer of Changjiangdiluted water (CDW). This aCDOM vs. SSS relationship, however, differed between 2009 and 2010. For mapping the CDW plume, the aCDOM was retrieved from an ocean-color satellite. Values of SSS were also derived from the satellite-retrieved aCDOM using field-based SSS vs. aCDOM relationships. Satellite observations revealed the temporary variable eastward extension of a high aCDOM, low SSS CDW plume in the central East China Sea (ECS) during the summer. The CDW plume during the summer of 2010 extended southeastward from the mouth of the Changjiang (Yangtze River) to almost 26°N. Moreover, the branch of this southeastward CDW plume was seen to extend northeastward to the eastern ECS where the Kuroshio Current flows northeastward along the shelf break. Subsequently, this branch was distributed around southern Kyushu. Satellite observations revealed this unique dispersal of the CDW plume, which illustrates that the aCDOM and SSS from oceancolor satellite data are useful for monitoring the dispersal of this river-water plume.

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Section: Satellite-derived Acdom Datamentioning

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Unique Dispersal of the Changjiang-Diluted Water Plume in the East China Sea Revealed from Satellite Monitoring of Colored Dissolved Organic Matter (CDOM)

Sasaki¹,

Gomi²,

Asai³

et al. 2014

Terr. Atmos. Ocean. Sci.

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“…The influence of dams on land-sea river transport and the related effects on the coastal zones have been reported in many areas around the world adjacent to dammed drainage basins (Humborg et al, 1997;Gong et al, 2006;Schöne et al, 2006). Additionally, some studies have focussed on the trapping efficiency of reservoirs and the effects on hydrograph, sediment and nutrient transport as well as the overall ecological conditions of the dammed watersheds (Friedl and Wüest, 2002;Gubiani et al, 2010).…”

Section: Introductionmentioning

confidence: 96%

The influence of castanhão reservoir on nutrient and suspended matter transport during rainy season in the ephemeral Jaguaribe river (CE, Brazil)

et al. 2013

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Measurements of nutrient and suspended matter concentrations and loads entering and leaving the Castanhão reservoir during the rainy season were carried out to assess the influence of this large reservoir on land-sea fluvial transport in the ephemeral Jaguaribe river basin. Spatial variation indicated statistically significant attenuation of concentrations only for total phosphorous and suspended matter across the reservoir. Strong retention of nutrients and suspended matter loads by the reservoir was observed with average trapping efficiency of 89% for dissolved silicon, 98% of soluble reactive phosphorus, 71% for ammonium, 87% for total nitrogen, 98% for total phosphorus and 97% for suspended matter compared to the reservoir inflow. The dam operational procedure defined by the ephemeral conditions of the river reduced water releases compared to reservoir inflow and induced strong retention of nutrient and suspended matter loads within the reservoir when fluvial transfer occurs in this semiarid watershed.Keywords: dam, semi-arid, nutrient budget, sediment retention, impoundment.Influência do açude Castanhão no transporte de nutrientes e materiais em suspensão durante a estação chuvosa no intermitente rio Jaguaribe (CE, Brasil) ResumoMedidas de concentrações e fluxos de nutrientes e material particulado em suspensão de entrada e saída do Açude Castanhão foram efetuadas para determinar a influência de um grande reservatório no transporte fluvial entre o continente e o oceano na bacia hidrográfica intermitente do Rio Jaguaribe. A variação espacial indicou uma atenuação estatisticamente significativa ao longo do reservatório somente para as concentrações de fósforo total e material particulado em suspensão. Os resultados indicam uma forte retenção de nutrientes e do material particulado em suspensão com eficiências de retenção de 89% para sílica dissolvida, 98% para fósforo solúvel reativo, 71% para amônia, 87% para nitrogênio total, 98% para fósforo total e 97% para o material particulado em suspensão em relação aos fluxos de entrada no reservatório. A rotina de operação da barragem definida pela condição intermitente do Rio Jaguaribe reduz a descarga de água comparada com a entrada no reservatório e induz forte retenção do fluxo fluvial de nutrientes e material particulado em suspensão pelo reservatório.Palavras-chave: barragem, semiárido, balanço de nutrientes, retenção de sedimentos, represamento de águas.

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“…According to Gong et al (2006), the primary production off the CRE, as high as 2 079 mg/(m 3 ·d), was induced mostly by riverine nutrient input. NO − 3 concentration off the CRE, in average of 17.6 μmol/L in 2003-2006, was about 1.5-fold of that in the 1980s .…”

Section: Introductionmentioning

confidence: 99%

Distribution of ammonia-oxidizing Betaproteobacteria community in surface sediment off the Changjiang River Estuary in summer

Bai

Gao

et al. 2011

Acta Oceanol. Sin.

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The spatial distribution of ammonia-oxidizing Betaproteobacteria (βAOB) was investigated by FISH (fluorescence in situ hybridization) and DGGE (denaturing gradient gel electrophoresis) techniques in the sediment off the Changjiang River Estuary. Sediment samples were collected from eight stations in June before the formation of hypoxia zone in 2006. The abundance of βAOB ranged from 1.87×10 5 to 3.53×10 5 cells/g of sediment. βAOB abundance did not present a negative correlation with salinity, whereas salinity was implicated as the primary factor affecting nitrification rates. The DGGE profiles of PCR-amplified amoA gene fragments revealed that the βAOB community structure of sample S2 separated from other samples at the level of 40% similarity. The variations in composition of βAOB were significantly correlated with the salinity, temperature, absorption ability of sediments and TOC. The statistical analysis indicates that the βAOB abundance was a main factor to influence nitrification rates with an influence ratio of 87.7% at the level of 40% biodiversity similarity. Considering the good correlation between βAOB abundance and nitrification estimates, the abundance and diversity of βAOB community could be expected as an indirect index of nitrification activity at the study sea area in summer.

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Reduction of primary production and changing of nutrient ratio in the East China Sea: Effect of the Three Gorges Dam?

Cited by 216 publications

References 20 publications

Unique Dispersal of the Changjiang-Diluted Water Plume in the East China Sea Revealed from Satellite Monitoring of Colored Dissolved Organic Matter (CDOM)

Unique Dispersal of the Changjiang-Diluted Water Plume in the East China Sea Revealed from Satellite Monitoring of Colored Dissolved Organic Matter (CDOM)

The influence of castanhão reservoir on nutrient and suspended matter transport during rainy season in the ephemeral Jaguaribe river (CE, Brazil)

Distribution of ammonia-oxidizing Betaproteobacteria community in surface sediment off the Changjiang River Estuary in summer

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