Biogeochemical processes in sandy beach sediments of Spiekeroog Island and Majorca

斯皮克罗格岛和马略卡岛沙滩沉积物的生物地球化学过程

基本信息

批准号：
288572447
负责人：
Professor Dr. Hans-Jürgen Brumsack
金额：
--
依托单位：
Institut für Chemie und Biologie des Meeres (ICBM)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/288572447?language=en
关键词：
Biogeochemical processes sandy beach sediments

项目摘要

Wave- and tide-dominated sandy beaches comprise a major part of the Worlds coastline and play an important role in carbon, nutrient and metal cycling. During rising tide seawater penetrates into the sediment and simultaneously organic matter is incorporated. Benthic microorganisms degrade this organic matter and during ebb tide nutrient-enriched water discharges into coastal seawater where the recycled nutrients are utilized for primary production. Microbial degradation processes lead to redox gradients, which have an impact on the pore water composition. Beaches can further be located in a mixing zone of fresh groundwater and seawater (subterranean estuary). Here, salinity gradients may influence sediment-pore water interaction and fresh groundwater flow serves as a source for terrestrial-derived solutes. To understand the global role of beach systems regarding carbon, nutrient and metal cycling, it is therefore vital to investigate biogeochemical processes in beach sediments in detail and at several locations worldwide. Since there are still few studies in this field, especially with a focus on the source or sink function of these systems regarding redox sensitive trace metals, this project will form an important contribution to the present state of research. We plan to investigate biogeochemical processes in the subterranean estuaries of two contrasting beach systems on the Islands Spiekeroog (NW Germany, mesotidal, siliciclastic) and Majorca (Spain, microtidal, calcareous). We intend to analyze major ions, dissolved organic carbon, oxygen, hydrogen sulfide, nutrients (N, P, C, Si) and trace metals (Mn, Fe, U, Mo, V, Re) as well as Fe isotope ratios in beach pore waters. We further aim to characterize the sediment composition, which significantly influences the pore water composition. High resolution sampling will be conducted along cross shore transects (dune to low water line) down to 5 m (Spiekeroog) and 2 m (Majorca), respectively. This project focuses on the identification of redox and salinity gradients and their effects on the pore water composition. Hydrochemical modeling on the basis of the obtained data will be applied to contribute to a better understanding of the effects of mixing of chemically different groundwaters. We will be able to evaluate the source or sink function of beaches concerning essential phytoplankton nutrients and redox sensitive trace metals. Fe isotope ratios will extend the limited knowledge of Fe cycling in subterranean estuaries and provide a better substantiated Fe isotopic signature of discharging pore waters from these systems. Furthermore, this study will provide a profound data basis for modeling flux rates of distinct pore water constituents from permeable sediments into the coastal ocean.

波浪和潮汐主导的沙滩是世界海岸线的主要部分，在碳，营养和金属骑自行车中起着重要作用。在潮汐上升期间，海水渗透到沉积物中，同时有机物被纳入了。底栖微生物降低了这种有机物，在潮汐潮汐养分富集的水排放到沿海海水中，将回收的营养物用于初级生产。微生物降解过程导致氧化还原梯度，这会影响孔隙水的组成。海滩可以进一步位于新鲜地下水和海水（地下河口）的混合区域。在这里，盐度梯度可能会影响沉积物孔的水相互作用，而新鲜的地下水流量是陆生衍生溶质的来源。为了了解海滩系统在碳，营养和金属循环方面的全球作用，因此，在详细和在全球的几个地点进行详细研究海滩沉积物中的生物地球化学过程至关重要。由于该领域的研究仍然很少，尤其是关注这些系统在氧化还原敏感的痕量金属方面的源或下沉功能，因此该项目将对当前的研究状态构成重要贡献。我们计划研究岛上两个对比的海滩系统的地下河口中的生物地球化学过程（NW Germany，Mesotidal，Siliciclastic）和Majorca（西班牙，微胎面，钙质）。我们打算分析主要离子，溶解有机碳，氧气，硫化氢，营养素（N，P，C，SI）和微量金属（Mn，Fe，U，U，Mo，Mo，V，Re）以及海滩孔隙中的Fe同位素比率。我们进一步旨在表征沉积物组成，从而显着影响孔隙水成分。高分辨率采样将分别沿跨岸样带（沙丘至低水线）进行5 m（spiekeroog）和2 m（马略卡咖啡）进行。该项目的重点是鉴定氧化还原和盐度梯度及其对孔隙水成分的影响。基于获得的数据，水化学建模将有助于更好地理解化学上不同地下水的混合作用。我们将能够评估有关必需浮游植物养分和氧化还原敏感的微量金属的海滩的来源或下沉功能。 FE同位素比将扩大地下河口中Fe循环的有限知识，并提供了从这些系统中排出孔隙水的更好证实的Fe同位素签名。此外，这项研究将为从可渗透的沉积物到沿海海洋的不同孔隙水成分的通量速率建模。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Cycling of redox-sensitive elements in a sandy subterranean estuary of the southern North Sea

DOI：
10.1016/j.marchem.2016.11.003
发表时间：
2017-01
期刊：
Marine Chemistry
影响因子：
3
作者：
Anja Reckhardt;M. Beck;J. Greskowiak;B. Schnetger;M. Böttcher;M. Gehre;H. Brumsack
通讯作者：
Anja Reckhardt;M. Beck;J. Greskowiak;B. Schnetger;M. Böttcher;M. Gehre;H. Brumsack

Rare Earth Element Behavior in a Sandy Subterranean Estuary of the Southern North Sea

北海南部沙质地下河口的稀土元素行为

DOI：
10.3389/fmars.2020.00424
发表时间：
2020
期刊：
影响因子：
0
作者：
Paffrath R;Pahnke K;Behrens MK;Reckhardt A;Ehlert C;Schnetger B;Brumsack H-J
通讯作者：
Brumsack H-J

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

DOI：
10.1016/j.marchem.2017.01.001
发表时间：
2017-03-20
期刊：
MARINE CHEMISTRY
影响因子：
3
作者：
Beck, Melanie;Reckhardt, Anja;Zielinski, Oliver
通讯作者：
Zielinski, Oliver

Cycling of redox-sensitive trace metals in barrier island freshwater lenses.

DOI：
10.1016/j.scitotenv.2021.144964
发表时间：
2021-05
期刊：
The Science of the total environment
影响因子：
0
作者：
Anja Reckhardt;Stephan L. Seibert;T. Holt;J. Ahrens;M. Beck;G. Massmann;H. Brumsack
通讯作者：
Anja Reckhardt;Stephan L. Seibert;T. Holt;J. Ahrens;M. Beck;G. Massmann;H. Brumsack

Investigating the Land-Sea Transition Zone

考察陆海过渡区