Collaborative Research: Megaripples as biocatalytical filters

合作研究：巨波纹作为生物催化过滤器

• 批准号: 1851424
• 负责人: Peter Berg
• 金额: $ 36.16万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1851424&HistoricalAwards=false
• 关键词: Collaborative; Research; Megaripples; biocatalytical; filters

This project focuses on the role of large underwater sand formations, particularly at the mouths of estuaries, in the cycling of nutrients and organic materials. "Megaripples" are common features on marine sediments where bottom currents are rapid. In the northeastern Gulf of Mexico, these sand dune-like features are up to half a meter in height, with wavelengths reaching 20 meters. The investigators propose that megaripples act as large filter systems that rapidly convert dissolved and solid organic matter into inorganic carbon and nutrients, and thus influence the biological productivity of coastal waters. They propose to use a one-kilometer long megaripple field in the inlet of Chotawhatchee Bay, in the northeastern Gulf of Mexico, as a natural laboratory for studying these processes. In addition, they will conduct laboratory experiments to investigate the filter processes at a smaller scale. By producing data on the functioning of megaripples, the project addresses a knowledge gap that has implications on our understanding of the cycles of matter in coastal waters. The project offers opportunities for both graduate and undergraduate students in learning state-of-the-art techniques. The students will gain experience in working on high frequency data acquisition and analysis of 'big data'. To enhance outreach, the researchers will develop and teach two courses on Permeable Sediment Biogeochemistry and Aquatic Eddy Covariance Studies for the Saturday at the Sea program offered by Florida State University. Results will be disseminated via scientific journals, conference presentations and public lectures, and directly to the Apalachicola-National Estuarine Research Reserve (NERR), which will make the results available to the other 28 NERR sites. The two main project objectives are: 1) demonstrate the general function of megaripples as biocatalytical filters, and 2) demonstrate that common inlet megaripples contribute to nutrient retention in coastal bays. A 1 km long megaripple field in the inlet of Chotawhatchee Bay (wavelengths: ~20 m, amplitudes: 20 to 40 cm) in the northeastern Gulf of Mexico will be used as an in-situ laboratory. Measurements will characterize megaripple topography and the water flowing over them. Salinity and suspended particles are utilized as natural tracers to quantify solute and particle entrainment into the megaripples. This project will deploy non-invasive aquatic eddy covariance instruments equipped with newly developed robust sensors to quantify sedimentary remineralization in the flushed megaripple bed. This technique integrates the benthic oxygen flux over a large section of the megaripple field, while including the natural dynamics of currents and light. Real-time water column measurements with a boat-mounted flow-through analyzer permit rapid quantification of large horizontal gradients of key water column parameters. The in-situ measurements will be combined with laboratory column reactor experiments that quantify nutrient re-mobilization through organic carbon mineralization in flushed megaripple sand. The megaripple field in the inlet of Chotawhatchee Bay is easily accessible from shore and by small boat, expediting instrument deployments and in-situ measurements while reducing project costs. Synthesis of all data will produce a conceptual and quantitative understanding of megaripples as natural biocatalytical filters. Because transport and reaction in megaripples are governed by basic physical and biogeochemical processes, these results will reveal information on the general biogeochemical functioning of megaripples that so far is not available.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目重点研究大型水下沙层（特别是在河口口）在营养物和有机物质循环中的作用。 “巨型波纹”是海底水流湍急的海洋沉积物的常见特征。在墨西哥湾东北部，这些沙丘状特征的高度可达半米，波长可达 20 米。研究人员提出，巨型波纹充当大型过滤系统，可快速将溶解的固体有机物转化为无机碳和营养物，从而影响沿海水域的生物生产力。他们提议利用墨西哥湾东北部乔塔哈奇湾入口处一公里长的巨型波纹场作为研究这些过程的天然实验室。此外，他们还将进行实验室实验，以研究较小规模的过滤过程。通过生成有关巨型涟漪功能的数据，该项目解决了一个知识空白，该空白对我们对沿海水域物质循环的理解产生了影响。该项目为研究生和本科生提供学习最先进技术的机会。学生将获得高频数据采集和“大数据”分析的经验。为了加强推广，研究人员将为佛罗里达州立大学提供的周六海上项目开发并教授两门关于渗透性沉积物生物地球化学和水生涡度协方差研究的课程。研究结果将通过科学期刊、会议报告和公开讲座传播，并直接传播到阿巴拉契科拉国家河口研究保护区 (NERR)，这将使其他 28 个 NERR 站点获得结果。两个主要项目目标是：1）证明巨型波纹作为生物催化过滤器的一般功能，2）证明常见的入口巨型波纹有助于沿海海湾的养分保留。 墨西哥湾东北部 Chotawhatchee 湾入口处 1 公里长的巨型波纹场（波长：~20 m，振幅：20 至 40 cm）将被用作现场实验室。测量将表征巨波纹地形和流过它们的水。盐度和悬浮颗粒被用作天然示踪剂来量化巨波纹中夹带的溶质和颗粒。该项目将部署配备新开发的强大传感器的非侵入性水生涡流协方差仪器，以量化冲刷巨波纹床中的沉积物再矿化。该技术整合了大面积巨波纹场上的底栖氧通量，同时包括水流和光的自然动力学。使用船载流通分析仪进行实时水柱测量，可以快速量化关键水柱参数的大水平梯度。现场测量将与实验室柱反应器实验相结合，通过冲刷的巨波纹砂中的有机碳矿化来量化养分的再动员。 Chotawhatchee 湾入口处的巨型波纹场可以从海岸和乘小船轻松到达，从而加快仪器部署和现场测量，同时降低项目成本。所有数据的综合将对巨波纹作为天然生物催化过滤器产生概念和定量的理解。由于巨型波纹中的传输和反应受基本物理和生物地球化学过程的控制，因此这些结果将揭示迄今为止无法获得的有关巨型波纹一般生物地球化学功能的信息。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准。

项目成果

Drivers of Oyster Reef Ecosystem Metabolism Measured Across Multiple Timescales

跨多个时间尺度测量牡蛎礁生态系统代谢的驱动因素

• DOI: 10.1007/s12237-020-00745-w
• 发表时间: 2020
• 期刊: Estuaries and Coasts
• 影响因子: 2.7
• 作者: Volaric, Martin P.;Berg, Peter;Reidenbach, Matthew A.
• 通讯作者: Reidenbach, Matthew A.

Implications of increased intertidal inundation on seagrass net primary production

• DOI: 10.1016/j.ecss.2024.108636
• 发表时间: 2024-01-17
• 期刊: ESTUARINE COASTAL AND SHELF SCIENCE
• 影响因子: 2.8
• 作者: Lohrer，Andrew M.;Macdonald，Iain T.;Berg，Peter
• 通讯作者: Berg，Peter

Metabolism of a subtidal rocky mussel reef in a high-temperate setting: pathways of organic C flow

• DOI: 10.3354/meps13372
• 发表时间: 2020-07-09
• 期刊: MARINE ECOLOGY PROGRESS SERIES
• 影响因子: 2.5
• 作者: Attard, Karl M.;Rodil, Ivan F.;Glud, Ronnie N.
• 通讯作者: Glud, Ronnie N.

Reconciling the importance of meiofauna respiration for oxygen demand in muddy coastal sediments

协调小型动物呼吸对泥质沿海沉积物需氧量的重要性

• DOI: 10.1002/lno.12393
• 发表时间: 2023
• 期刊: Limnology and Oceanography
• 影响因子: 4.5
• 作者: Maciute, Adele;Holovachov, Oleksandr;Glud, Ronnie N.;Broman, Elias;Berg, Peter;Nascimento, Francisco J. A.;Bonaglia, Stefano
• 通讯作者: Bonaglia, Stefano

Seafloor primary production in a changing Arctic Ocean

• DOI: 10.1073/pnas.2303366121
• 发表时间: 2024-03-12
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Attard，Karl;Singh，Rakesh Kumar;Rysgaard，Soren
• 通讯作者: Rysgaard，Soren