Temporal and spatial distribution of Fe(II) and dissolved iron and their influencing factors in the Yangtze River estuary

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research Pub Date : 2025-02-01 DOI:10.1016/j.csr.2024.105385

Jiajia Yao , Rujun Yang , Yingying Zhang , Minghan Zhu , Mengqi Bi , Kunyu Ma , Yuan Liu , He Xie , Yao Wu

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引用次数: 0

Abstract

Iron (Fe) is an essential trace element for the growth and metabolism of marine plankton. Fe(II), the reduced form of iron, is highly soluble and more labile in seawater, contributing significantly to iron bioavailability in marine environments. This study investigates the temporal and spatial distributions of Fe(II) and dissolved iron (DFe) during autumn (October 11–22, 2018), spring (March 4–14, 2019), and summer (July 9–17, 2019) in the Yangtze River estuary. Fe(II) concentrations decreased from nearshore to offshore, with higher levels predominantly in areas influenced by Yangtze River water, indicating that terrestrial input from the river is the main source of Fe(II). Seasonal variations in Fe(II) concentrations were observed, with the highest levels in summer and the lowest in autumn. Median Fe(II) concentrations in autumn, spring and summer were 0.60 nM, 0.81 nM, and 1.33 nM, respectively. DFe concentrations generally decreased from nearshore to offshore, except in summer. The concentration of DFe exhibits seasonal variations. Median DFe concentrations in autumn, spring and summer were 16.10 nM, 44.65 nM, and 22.41 nM, respectively. Both Fe(II) concentrations and Fe(II)/DFe ratios peaked in summer surface waters. Significant correlations were found between Fe(II)/DFe ratios and NH₄-N/DIN or NO₃-N/DIN ratios in summer.

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来源期刊

Continental Shelf Research 地学-海洋学

CiteScore

4.30

自引率

4.30%

发文量

136

审稿时长

6.1 months

期刊介绍： Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.