Phosphorus fractions and their vertical distribution in seabed sediments of the eastern Baltic Sea

IF 2.1 3区 地球科学 Q2 OCEANOGRAPHY Continental Shelf Research Pub Date : 2024-10-09 DOI:10.1016/j.csr.2024.105340
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Abstract

Phosphorus fractions and their vertical distribution in seabed sediments were studied in short cores from four coastal sites of western Estonia (Western Gulf of Finland, Väinameri Sea, Suur Strait, and Gulf of Riga) representing accumulation and erosion/transport settings. As a result of recent large-scale discharges of nutrients into the marine environment, abundant phosphorus has accumulated in the seabed sediments, from where it can, under the expansion of hypoxic or anoxic conditions, be remobilized and released back into the water column. A sequential extraction method with a neutral, a reducing, a basis, and an acidic solution was used to evaluate the distribution of phosphorous in pools of five different carrier fractions. Potentially mobile phosphorus is mostly associated with redox-sensitive iron- and manganese oxyhydroxides, and this fraction is significant in the Western Gulf of Finland and the Gulf of Riga. As oxygen conditions gradually deteriorate, the remobilization of a considerable amount of potentially mobile phosphorus from sediments can affect the entire Baltic Sea ecosystem.
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波罗的海东部海底沉积物中的磷组分及其垂直分布
对爱沙尼亚西部四个沿海地点(西芬兰湾、韦纳梅里海、苏尔海峡和里加湾)的短岩心进行了研究,这些地点代表了积累和侵蚀/迁移环境,研究了海底沉积物中的磷组分及其垂直分布。由于最近向海洋环境大规模排放营养物质,大量磷在海床沉积物中积累,在缺氧或缺氧条件下,磷会从海床沉积物中重新移动并释放回水体。采用中性溶液、还原性溶液、碱性溶液和酸性溶液的顺序萃取法评估了磷在五种不同载体馏分池中的分布情况。潜在的移动磷主要与对氧化还原反应敏感的铁和锰氧氢氧化物有关,这部分磷在芬兰湾西部和里加湾的含量很高。随着氧气条件逐渐恶化,沉积物中大量潜在移动磷的再移动会影响整个波罗的海生态系统。
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来源期刊
Continental Shelf Research
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.
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