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Regional distribution patterns of chemical parameters in surface sediments of the south-western Baltic Sea and their possible causes

机译：西南波罗的海表面沉积物中化学参数的区域分布模式及其可能的原因

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This study presents selected results of a sediment geochemical mapping program of German territorial waters in the south-western Baltic Sea. The field work was conducted mainly during the early 2000s. Due to the strong variability of sediment types in the study area, it was decided to separate and analyse the fine fraction (< 63 mu m, mud) from more than 600 surficial samples, combined with recalculations for the bulk sediment. For the contents of total organic carbon (TOC) and selected elements (P, Hg), the regional distribution maps show strong differences between the analysed fine fraction and the recalculated total sediment. Seeing that mud contents vary strongly between 0 and 100%, this can be explained by the well-known grain-size effect. To avoid (or at least minimise) this effect, further interpretations were based on the data for the fine fraction alone. Lateral transport from the large Oder River estuary combined with high abundances and activities of benthic fauna on the shallow-water Oder Bank (well sorted fine sand) could be some main causes for hotspots identified in the fine-fraction element distribution. The regional pattern of primary production as the main driver of nutrient element fixation (C, N, P, Si) was found to be only weakly correlated with, for example, the TOC distribution in the fine fraction. This implies that, besides surface sediment dynamics, local conditions (e.g. benthic secondary production) also have strong impacts. To the best of the authors' knowledge, there is no comparable study with geochemical analyses of the fine fraction of marine sediments to this extent (13,600 km(2)) and coverage (between 600 and 800 data points) in the Baltic Sea. This aspect proved pivotal in confidently pinpointing geochemical "anomalies" in surface sediments of the south-western Baltic Sea.
机译：本研究提出了德国海域波罗的海德国领海的沉积地球化学映射计划的选定结果。现场工作主要是在2000年代初进行的。由于研究区域中沉积物类型的强大变异，决定将其与超过600个曲面样品的细部分（<63μm，泥浆）分离，并与散装沉积物的重新计算相结合。对于总有机碳（TOC）和选定的元素（P，HG）的含量，区域分布图显示出分析的细分分数和重新计算的总沉积物之间的强烈差异。看到泥质内容在0到100％之间变化强，这可以通过众所周知的粒度效应来解释。为了避免（或至少最小化）这种效果，进一步的解释基于单独的细分分​​数的数据。从大型河口的横向运输与浅水臭氧银行（良好分类的细砂）上的高度丰富和底栖动物的活动相结合，可以是细分元素分布中鉴定的热点的主要原因。发现作为营养素固定（C，N，P，Si）的主要驱动器的初级生产的区域模式仅与例如细分数中的TOC分布弱相关。这意味着，除了表面沉积物动态之外，局部条件（例如底栖二次生产品）也具有强烈的影响。据作者的知识，没有可比的研究与这种程度的海洋沉积物的细分分析（13,600公里）和波罗的海中的覆盖率（在600至800厘米之间）。这一方面证明了枢轴在自信地定位地球化学“异常”在西南波罗的海的表面沉积物中。

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  • 来源
    《Geo-marine letters》 |2017年第6期|共14页
  • 作者

    Leipe T.; Naumann M.; Tauber F.; Radtke H.; Friedland R.; Hiller A.; Arz H. W.;

  • 作者单位

    Leibniz Inst Balt Sea Res Warnemunde IOW Seestr 15 D-18119 Rostock Germany;

    Leibniz Inst Balt Sea Res Warnemunde IOW Seestr 15 D-18119 Rostock Germany;

    Leibniz Inst Balt Sea Res Warnemunde IOW Seestr 15 D-18119 Rostock Germany;

    Leibniz Inst Balt Sea Res Warnemunde IOW Seestr 15 D-18119 Rostock Germany;

    Leibniz Inst Balt Sea Res Warnemunde IOW Seestr 15 D-18119 Rostock Germany;

    Leibniz Inst Balt Sea Res Warnemunde IOW Seestr 15 D-18119 Rostock Germany;

    Leibniz Inst Balt Sea Res Warnemunde IOW Seestr 15 D-18119 Rostock Germany;

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  • 中图分类 海洋学;
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