Distributions and influencing factors of dissolved aluminum in the  Zhujiang River Estuary,continental slope of the northern South China Sea in autumn and summer

Zhang Xiaohong; Ren Jingling; Guo Ying; Li Lei; Zhang Ruifeng

doi:10.3969/j.issn.0253-4193.2020.02.002

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Zhang Xiaohong，Ren Jingling，Guo Ying, et al. Distributions and influencing factors of dissolved aluminum in the Zhujiang River Estuary,continental slope of the northern South China Sea in autumn and summer[J]. Haiyang Xuebao，2020, 42(2)：10–21，doi:10.3969/j.issn.0253−4193.2020.02.002

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Distributions and influencing factors of dissolved aluminum in the Zhujiang River Estuary,continental slope of the northern South China Sea in autumn and summer

doi: 10.3969/j.issn.0253-4193.2020.02.002

1.
Key Laboratory of for Marine Chemistry Theory and Technology, Ministry of Education,Ocean University of China, Qingdao 266100, China
2.
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China

Received Date: 2019-02-20
Rev Recd Date: 2019-05-21

Available Online: 2020-11-18

Publish Date: 2020-02-25

Abstract

Abstract

Distributions of dissolved aluminum in the Zhujiang River Estuary and slope of the northern South China Sea (NSCS) were observed in October 2014 and June 2015, respectively. We discuss the main factors affecting its distribution and seasonal variation, and use dissolved aluminum as a tracer to explore the potential cross-shelf transport of terrestrial materials. The concentrations of dissolved aluminum in the Zhujiang River were 690 nmol/L and 360 nmol/L in summer and autumn, respectively. Dissolved aluminum were significantly removed from the water column in the initial mixing of fresh and saline water in the Zhujiang River Estuary, with scavenging rate of 55.8% and 29.7% in summer and autumn, respectively. In the slope of the NSCS, the concentration of dissolved aluminum in the surface decreased from east to west along the latitude in summer and was completely opposite in autumn. The concentrations of dissolved aluminum in the bottom were gradually decreased across the NSCS shelf with the increasing distance from the coast both in summer and autumn. The negative correlation between dissolved aluminum and salinity in autumn indicated that the behavior of dissolved aluminum was nearly conservative and the mixing of different water masses including shelf mixed water and kuroshio subsurface water was the main influencing factor. Dissolved aluminum showed decreasing trend from the continental shelf to the middle of NSCS along the isopycnal surfaces of 21.6 to 22.2 kg/m³, indicating the potential cross-shelf transport path in the NSCS. In summer, there was a water tough with lower salinity appeared in the middle of the study area, indicating the influence of the Zhujiang diluted water. However, the concentration of dissolved aluminum was relatively low corresponding to the water mass with low salinity. Scavenging by phytoplankton bloom in the top mixed layer was the major influencing factor of semi-conservative behavior of dissolved aluminum in summer.
- dissolved aluminum,
- distribution,
- influencing factors,
- cross-continental transport,
- Zhujiang River Estuary,
- the northern continental slope of the South China Sea

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References

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