Seasonal variations of dissolved Mn concentration in the surface water of the Changjiang River Estuary and its adjacent area

Zhou Dongxuan; Ge Yuncong; Jiang Ziyuan; Ruan Yaqing; Cao Fang; Yang Shouye; Zhang Ruifeng

doi:10.12284/hyxb2024006

Volume 46 Issue 1

Jan. 2024

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Article Navigation > Haiyang Xuebao > 2024 > 46(1): 111-120

Zhou Dongxuan，Ge Yuncong，Jiang Ziyuan, et al. Seasonal variations of dissolved Mn concentration in the surface water of the Changjiang River Estuary and its adjacent area[J]. Haiyang Xuebao，2024, 46(1)：111–120 doi: 10.12284/hyxb2024006

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Seasonal variations of dissolved Mn concentration in the surface water of the Changjiang River Estuary and its adjacent area

doi: 10.12284/hyxb2024006

1.
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
2.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
3.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
4.
Key Laboratory of Polar Science, Ministry of Natural Resources, Polar Research Institute of China, Shanghai 200136, China

Received Date: 2023-07-26
Rev Recd Date: 2023-09-12

Available Online: 2023-12-19

Publish Date: 2024-01-01

Abstract

Abstract

Manganese (Mn) is an essential trace element for the marine ecosystem. As the transitional zone between rivers and oceans, estuaries have a significant effect on dissolved Mn and its terrigenous input. In this study, the distribution of dissolved Mn, investigated in the surface water of Changjiang River Estuary and its adjacent area during September 2019 (autumn), March 2021 (spring) and July 2021 (summer), was analyzed by automatic solid phase extraction and inductively coupled plasma mass spectrometry. The results indicated that the average concentration and estuarine behaviors of dissolved Mn showed seasonal variations between the three cruises: the maximum average concentration occurred in summer and dissolved Mn was removed firstly and then added with the increase of salinity; the medium average concentration occurred in autumn and dissolved Mn was mainly removed with the increase of salinity; the minimum average concentration occurred in spring and dissloved Mn was mainly conservative with the increase of salinity. The results of significance test indicated that only in the season when the fresh water had high concentrations, dissloved Mn carried by the Changjiang River had significant influence on the distribution of dissolved Mn in the Changjiang River Estuary and its adjacent area; the distribution of dissolved Mn was co-dominated by a variety of biogeochemical processes in the season when the concentrations were low in the fresh water. The high suspended particulate matter concentrations were the important factor of the removal of dissolved Mn in the Changjiang Estuary’s water with medium-low salinity. And the addition mechanism of dissolved Mn in water with high salinity needs further vestigation.
- the Changjiang River Estuary and its adjacent area,
- dissolved Mn,
- seasonal distribution,
- estuarine behavior,
- suspended particulate matter

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