Monitoring the occurrence of seasonal low‐oxygen events off the <scp>C</scp>hangjiang <scp>E</scp>stuary through integration of remote sensing, buoy observations, and modeling

Chen, Jianyu; Ni, Xiaobo; Liu, Mingliang; Chen, Jianfang; Mao, Zhihua; Jin, Haiyan; Pan, Delu

doi:10.1002/2014jc010333

Cited by 16 publications

(11 citation statements)

References 47 publications

(47 reference statements)

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“…An accurate estimation of tidal currents therefore is essential to understand the physical and biogeochemical processes in the ECS [ Gao et al ., ; Li and Rong , ; Moon et al ., ; Xuan et al ., ]. Tidal mixing also plays an important role in the recurring hypoxia condition off the mouth of the Changjiang Estuary [ Chen et al ., ]. Furthermore, the tidal current information is important for practical applications such as the search and rescue, marine navigation, and environmental monitoring.…”

Section: Introductionmentioning

confidence: 99%

Mapping surface tidal currents and Changjiang plume in the East China Sea from Geostationary Ocean Color Imager

Wang

Pan

et al. 2016

JGR Oceans

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The spatial pattern of the semidiurnal M2 tidal currents in the East China Sea (ECS) is mapped from the Geostationary Ocean Color Imager (GOCI), taking advantage of the satellite's unique 8 hourly local daytime sequential images. The GOCI‐derived surface M2 tidal currents are validated with a comprehensive set of twenty‐eight surface drifters and four mooring observations. The agreement is outstanding with the error variance less than 10% of the total variance. The gridded GOCI‐derived tidal currents are also in good agreement with the Oregon State University (OSU) high‐resolution regional tidal model of the China Seas. The detided mean flow shows a strong Changjiang plume extending hundreds of kilometers offshore, in agreement with the concurrent satellite sea surface temperature (SST) and sea surface salinity (SSS) distributions. The observed surface currents are compared with the daily mean flows derived from the Japan Coastal Ocean Predictability Experiment (JCOPE2). The model results are consistent with the observations, showing the sensitivity of Changjiang plume to wind forcing. The study clearly demonstrates the utility of geostationary satellite in mapping the surface currents over a wide (∼400 km), tidally dominated continental shelf.

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Section: Introductionmentioning

confidence: 99%

Mapping surface tidal currents and Changjiang plume in the East China Sea from Geostationary Ocean Color Imager

Wang

Pan

et al. 2016

JGR Oceans

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“…Strong wind could trigger strong vertical mixing and promote the vertical exchange of dissolved oxygen, which broke the formation of hypoxia (Chen et al, 2014;Ni et al, 2014). Our simulated results showed that the variation in wind speed and direction significantly influence the stratification and hence the hypoxic area.…”

Section: Wind Forcingmentioning

confidence: 76%

Modeling the impact of river discharge and wind on the hypoxia off Yangtze Estuary

Zheng¹,

Gao²,

Liu³

et al. 2016

Preprint

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Abstract. The phenomenon of low dissolved oxygen (known as hypoxia) in coastal ocean system is closely related to a combination of anthropogenic and natural factors. Marine hypoxic occurs in the Yangtze Estuary, China with high frequency and long persistence. It’s known that it related primarily to organic and nutrient enrichment influenced by river discharges and physical factors, such as water mixing. In this paper, a three-dimensional hydrodynamic model was coupled to a biological model to simulate and analyze the ecological system of the East China Sea. By comparing with the observation data, the model results can reasonably capture the physical and biochemical dynamics of the Yangtze Estuary. In addition, the sensitive experiments were also used to examine the role of physical forcing (river discharge, wind speed, wind direction) in controlling hypoxia in waters adjacent to the Yangtze Estuary. The results showed that the wind field and river discharge have significant impact on the hypoxia off the Yangtze Estuary. The seasonal cycle of hypoxia was relatively insensitive to synoptic variability in the river discharge, but integrated hypoxic areas were sensitive to the whole magnitude of river discharge. Increasing the river discharge was shown to increase hypoxic areas, while decreasing the river discharge was tended to decrease hypoxic areas. And the variations of wind speed and direction had great impact on the seasonal variability of hypoxia and the integrated hypoxic areas.

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“…SPM, sediments or pollution events (e.g. Brown and Power, 2011;Chen et al, 2014;Testa and Kemp, 2014).…”

Section: Discussionmentioning

confidence: 99%

Seasonal variability of turbidity, salinity, temperature and suspended chlorophyll in a strongly tidal sub-estuary: The Lynher Marine Conservation Zone

Uncles

Hooper²,

Stephens

et al. 2018

Estuarine, Coastal and Shelf Science

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The Lynher Estuary in southwest England is a small, strongly tidal sub-estuary of the Tamar Estuary. It is a Site of Special Scientific Interest (SSSI), a Marine Conservation Zone (MCZ), a part of the Plymouth Sound and Estuaries Special Area of Conservation (SAC) and a Special Protection Area (SPA). Management of the Lynher SSSI and MCZ stipulates that good water quality and sediment quality should be maintained; as such, a good understanding of its responses to influences such as climate change and changes in agricultural practices within its catchment area is required. Observations of salinity, temperature, suspended particulate matter (SPM) concentrations, estuarine turbidity maximum (ETM) behaviour, and chlorophyll-a are presented for the Lynher over a 1-y period. The dataset provides important baseline information with which to identify future changes and guide management of the SSSI and MCZ as well as adding to our knowledge of estuarine systems. Salt intrusion is largely controlled by tides and runoff. A persistent ETM occurs that is closely associated with the freshwater-saltwater interface at high water (HW) and with a minimum in dissolved oxygen concentrations. HW depth-averaged ETM magnitudes are relatively low, less than 60 mg l-1 and typically 30 mg l-1 over the observation period. Larger tides and stronger floodtide wind speeds lead to a stronger ETM. Tidal river HW SPM concentrations are intrinsically small (8±8 mg l-1 during the observation period). Surface chlorophyll-a concentrations are low during winter (when they often peak near the ETM) and are much higher during spring and summer.

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Monitoring the occurrence of seasonal low‐oxygen events off the Changjiang Estuary through integration of remote sensing, buoy observations, and modeling

Cited by 16 publications

References 47 publications

Mapping surface tidal currents and Changjiang plume in the East China Sea from Geostationary Ocean Color Imager

Mapping surface tidal currents and Changjiang plume in the East China Sea from Geostationary Ocean Color Imager

Modeling the impact of river discharge and wind on the hypoxia off Yangtze Estuary

Seasonal variability of turbidity, salinity, temperature and suspended chlorophyll in a strongly tidal sub-estuary: The Lynher Marine Conservation Zone

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