Sedimentation in the Outer Hangzhou Bay, China: The Influence of Changjiang Sediment Load

Dai, Zhijun; Liu, James T.; Xie, Huixiang; Shi, Weiyong

doi:10.2112/jcoastres-d-12-00164.1

Cited by 29 publications

(16 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The river flux of Changjiang River is more than 20 times that of Qiantang River. In addition, previous hydrological and biomarker research had indicated that CDW may flow into Hangzhou Bay (Qiantang River) and represented the major source of sediment in the Hangzhou Bay (Dai et al, ; Su & Wang, ; Xu et al, ). Thus, Hangzhou Bay water was not considered as an end‐member.…”

Section: Discussionmentioning

confidence: 99%

Effects of Biological Production and Vertical Mixing on Sea Surface pCO₂ Variations in the Changjiang River Plume During Early Autumn: A Buoy‐Based Time Series Study

Chen

et al. 2018

JGR Oceans

View full text Add to dashboard Cite

A monthlong, high-resolution buoy time series from the surface ocean of the Changjiang River plume in early autumn 2013 (30-min sampling frequency) shows great variability in the partial pressure of carbon dioxide (pCO 2 ) and other physical and biogeochemical parameters. Early in the deployment, surface pCO 2 decreased by~117 μatm in a single day (11-12 September, from an initial value of~527 μatm); a similar decline of 62 μatm occurred five days later (to~378 μatm). Both drawdown events were associated with strong vertical stratification, high chlorophyll a concentrations, and oxygen supersaturation. A one-dimensional mass balance model suggests that biological production was responsible for more than half the pCO 2 decrease observed during 10-23 September. Subsequently, in association with strong winds, the mixed layer rapidly deepened and surface pCO 2 increased sharply (by about 108 μatm in late September and again in early October). Vertical mixing accounted for more than half of this pCO 2 increase, which offset more than the earlier biologically driven CO 2 drawdown. In the presence of such strong temporal variations of pCO 2 , sampling frequency exerts a substantial influence on air-sea CO 2 flux calculations for the Changjiang River plume and similar coastal areas. Compared to daily sampling, even weekly sampling would result in a bias of up to ±4.7 mmol C · m À2 · day À1 or ±63% error.Plain Language Summary Determining the mechanisms that control sea surface pCO 2 and its variability in coastal waters is an important step toward estimating global air-sea CO 2 fluxes and projecting future atmospheric CO 2 levels. In this study, a 31-day high-resolution buoy time series from the surface ocean of the Changjiang River plume in early autumn 2013 show great variability in the partial pressure of carbon dioxide (pCO 2 ) and other parameters. Early in the deployment, surface pCO 2 decreased sharply in short period (one to five days). The pCO 2 drawdown events were associated with strong vertical stratification, high chlorophyll a concentrations, and oxygen supersaturation. A mass balance model suggests that biological production was responsible for more than half the pCO 2 decrease observed. Subsequently, in association with strong northeast winds, the mixed layer rapidly deepened and surface pCO 2 increased sharply. Vertical mixing accounted for more than half of this pCO 2 increase. In the presence of such strong temporal variations of pCO 2 , sampling frequency exerts a substantial influence on air-sea CO 2 flux calculations for the Changjiang River plume and similar coastal areas.With respect to the partial pressure of carbon dioxide (pCO 2 ) at the sea surface, the biological processes triggered and maintained by subsurface and riverine nutrient inputs are particularly important in lowering surface pCO 2 values (Cao et al.

show abstract

Section: Discussionmentioning

confidence: 99%

Effects of Biological Production and Vertical Mixing on Sea Surface pCO₂ Variations in the Changjiang River Plume During Early Autumn: A Buoy‐Based Time Series Study

Chen

et al. 2018

JGR Oceans

View full text Add to dashboard Cite

show abstract

“…Samples were stored anoxically on ice in gas-tight bags and were transported to the laboratory within 3 h, where they were kept at 4°C until further treatment. The samples were dominated by silt sediment, which is mainly supplied by the Yangtze River (33) and is considered to be rich in terrigenous organic matter (34).…”

Section: Methodsmentioning

confidence: 99%

Growth of sedimentaryBathyarchaeotaon lignin as an energy source

Liang

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

195

181

View full text Add to dashboard Cite

Members of the archaeal phylum are among the most abundant microorganisms on Earth. Although versatile metabolic capabilities such as acetogenesis, methanogenesis, and fermentation have been suggested for bathyarchaeotal members, no direct confirmation of these metabolic functions has been achieved through growth of in the laboratory. Here we demonstrate, on the basis of gene-copy numbers and probing of archaeal lipids, the growth of subgroup Bathy-8 in enrichments of estuarine sediments with the biopolymer lignin. Other organic substrates (casein, oleic acid, cellulose, and phenol) did not significantly stimulate growth of Meanwhile, putative bathyarchaeotal tetraether lipids incorporated C fromC-bicarbonate only when added in concert with lignin. Our results are consistent with organoautotrophic growth of a bathyarchaeotal group with lignin as an energy source and bicarbonate as a carbon source and shed light into the cycling of one of Earth's most abundant biopolymers in anoxic marine sediment.

show abstract

“…The regions shallower than the -5-m isobath on the submerged delta of the Changjiang was still in the state of accretion (Yang et al, 2011). Controversy continues regarding whether or not the shores around the mouth of Changjang will start to erode (Chen et al, 2010;Yang et al, 2011;Dai et al, 2012Dai et al, , 2013aWang et al, 2013). Sediment supplied by the Changjiang determines the seaward progradation of its river mouth (Chen et al, 1985).…”

Section: The Changing Sediment Load Of Changjiangmentioning

confidence: 99%

Morphological evolution of the South Passage in the Changjiang (Yangtze River) estuary, China

Dai

Liu

Wen

2015

Quaternary International

Self Cite

View full text Add to dashboard Cite

Estuarine morphology of the world's major large rivers have experienced great changes due to intensive anthropogenic activities and natural forcings, especially in the Changjiang Estuary located at the end of the longest river in Asia. This study focuses on morphological changes of the South Passage (SP), which is one of the 4 channels in the branching estuary at the mouth of the Changjiang (Yangtze River), China. A multivariate analysis technique of Empirical Orthogonal/Eigen Function (EOF) method was used to examine the major modes of change in the long-term (over 26 years) water-depth data. The results show that the morphological changes at the SP could be divided into two stages: between 1987-1997, the SP had a single stable channel with closure of a cross-channel. Between 1997-2012, SP displayed southeastward elongation of a spit into the main channel, and westward shoal incision by a cross-channel. The opening of the SP developed a two-channel morphology, which stabilized and showed infilling during 2003-2012. The average deposition rate was 10 cm/yr. In the past 30 years, the most dominant morphological changes of SP

show abstract

Sedimentation in the Outer Hangzhou Bay, China: The Influence of Changjiang Sediment Load

Cited by 29 publications

References 17 publications

Effects of Biological Production and Vertical Mixing on Sea Surface pCO₂ Variations in the Changjiang River Plume During Early Autumn: A Buoy‐Based Time Series Study

Effects of Biological Production and Vertical Mixing on Sea Surface pCO₂ Variations in the Changjiang River Plume During Early Autumn: A Buoy‐Based Time Series Study

Growth of sedimentaryBathyarchaeotaon lignin as an energy source

Morphological evolution of the South Passage in the Changjiang (Yangtze River) estuary, China

Contact Info

Product

Resources

About

Sedimentation in the Outer Hangzhou Bay, China: The Influence of Changjiang Sediment Load

Cited by 29 publications

References 17 publications

Effects of Biological Production and Vertical Mixing on Sea Surface pCO2 Variations in the Changjiang River Plume During Early Autumn: A Buoy‐Based Time Series Study

Effects of Biological Production and Vertical Mixing on Sea Surface pCO2 Variations in the Changjiang River Plume During Early Autumn: A Buoy‐Based Time Series Study

Growth of sedimentaryBathyarchaeotaon lignin as an energy source

Morphological evolution of the South Passage in the Changjiang (Yangtze River) estuary, China

Contact Info

Product

Resources

About

Effects of Biological Production and Vertical Mixing on Sea Surface pCO₂ Variations in the Changjiang River Plume During Early Autumn: A Buoy‐Based Time Series Study

Effects of Biological Production and Vertical Mixing on Sea Surface pCO₂ Variations in the Changjiang River Plume During Early Autumn: A Buoy‐Based Time Series Study