Organic Matter and Biomarkers of the Changjiang Estuary and East China Sea Shelf

2015 ◽  
pp. 119-135
Author(s):  
Ying Wu ◽  
Zhuoyi Zhu ◽  
Hongyan Bao ◽  
Shuchai Gan ◽  
Jing Zhang
Keyword(s):  
Organic Matter ◽  
East China Sea ◽  
Changjiang Estuary ◽  
East China ◽  
The Changjiang Estuary ◽  
China Sea ◽  
East China Sea Shelf

scholarly journals Air–sea CO<sub>2</sub> fluxes in the East China Sea based on multiple-year underway observations

2015 ◽  
Vol 12 (18) ◽  
pp. 5495-5514 ◽  
Author(s):  
X.-H. Guo ◽  
W.-D. Zhai ◽  
M.-H. Dai ◽  
C. Zhang ◽  
Y. Bai ◽  
...  
Keyword(s):  
East China Sea ◽  
Co2 Flux ◽  
Changjiang Estuary ◽  
East China ◽  
The East China Sea ◽  
The Changjiang Estuary ◽  
Data Set ◽  
China Sea ◽  
Fujian Coast ◽  
Partial Pressure Of Co2

Abstract. This study reports the most comprehensive data set thus far of surface seawater pCO2 (partial pressure of CO2) and the associated air–sea CO2 fluxes in a major ocean margin, the East China Sea (ECS), based on 24 surveys conducted in 2006 to 2011. We showed highly dynamic spatial variability in sea surface pCO2 in the ECS except in winter, when it ranged across a narrow band of 330 to 360 μatm. We categorized the ECS into five different domains featuring with different physics and biogeochemistry to better characterize the seasonality of the pCO2 dynamics and to better constrain the CO2 flux. The five domains are (I) the outer Changjiang estuary and Changjiang plume, (II) the Zhejiang–Fujian coast, (III) the northern ECS shelf, (IV) the middle ECS shelf, and (V) the southern ECS shelf. In spring and summer, pCO2 off the Changjiang estuary was as low as < 100 μatm, while it was up to > 400 μatm in autumn. pCO2 along the Zhejiang–Fujian coast was low in spring, summer and winter (300 to 350 μatm) but was relatively high in autumn (> 350 μatm). On the northern ECS shelf, pCO2 in summer and autumn was > 340 μatm in most areas, higher than in winter and spring. On the middle and southern ECS shelf, pCO2 in summer ranged from 380 to 400 μatm, which was higher than in other seasons (< 350 μatm). The area-weighted CO2 flux on the entire ECS shelf was −10.0 ± 2.0 in winter, −11.7 ± 3.6 in spring, −3.5 ± 4.6 in summer and −2.3 ± 3.1 mmol m−2 d−1 in autumn. It is important to note that the standard deviations in these flux ranges mostly reflect the spatial variation in pCO2 rather than the bulk uncertainty. Nevertheless, on an annual basis, the average CO2 influx into the entire ECS shelf was 6.9 ± 4.0 mmol m−2 d−1, about twice the global average in ocean margins.

Temporal distribution of the archaeal community in the Changjiang Estuary hypoxia area and the adjacent East China Sea as determined by denaturing gradient gel electrophoresis and multivariate analysis

2011 ◽  
Vol 57 (6) ◽  
pp. 504-513 ◽  
Author(s):  
Min Liu ◽  
Tian Xiao ◽  
Ying Wu ◽  
Feng Zhou ◽  
Wuchang Zhang
Keyword(s):  
East China Sea ◽  
Gel Electrophoresis ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Archaeal Community ◽  
Changjiang Estuary ◽  
East China ◽  
The Changjiang Estuary ◽  
China Sea ◽  
Gradient Gel Electrophoresis ◽  
Archaeal Communities

The archaeal community and the effects of environmental factors on microbial community distribution were investigated at five sampling sites in the Changjiang Estuary hypoxia area and the adjacent East China Sea in June, August, and October 2006. Profiles of the archaeal communities were generated by denaturing gradient gel electrophoresis of 16S rRNA genes followed by DNA sequence analysis, and the results were analyzed by multivariate statistical analysis. Denaturing gradient gel electrophoresis band patterns were analyzed by cluster analysis to assess temporal changes in the genetic diversity of the archaeal communities. Most of the October samples grouped together separately from those of June and August. Analysis of DNA sequences revealed that the dominant archaeal groups in the Changjiang Estuary hypoxia area and the adjacent East China Sea were affiliated with Euryarchaeota (mainly marine group II) and Crenarchaeota. The effects of environmental factors on the archaeal community distribution were analyzed by the ordination technique of canonical correspondence analysis. Salinity had a significant effect on the archaeal community composition.

Eutrophication-Driven Hypoxia in the East China Sea off the Changjiang Estuary

2016 ◽  
Vol 50 (5) ◽  
pp. 2255-2263 ◽  
Author(s):  
Hongjie Wang ◽  
Minhan Dai ◽  
Jinwen Liu ◽  
Shuh-Ji Kao ◽  
Chao Zhang ◽  
...  
Keyword(s):  
East China Sea ◽  
Changjiang Estuary ◽  
East China ◽  
The East China Sea ◽  
The Changjiang Estuary ◽  
China Sea
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