RAPID: Collaborative Research: Remineralization effects of enhanced allochthonous dissolved organic matter in the West Florida Shelf impacted by Hurricane Ian

该项目将研究2022年9月飓风伊恩期间输送到西佛罗里达大陆架的有机物和营养物质的命运。这项研究将集中在飓风事件的三个方面：(1)细菌和光如何改变溶解的有机物在离岸运输的过程中，(2)这种大的有机物脉冲对无机碳参数和有机碱度的影响，以及(3)从这些有机物的循环利用中获得的营养物质是否会刺激有害的藻类繁殖。参与该项目的科学家在2022年8月底/ 9月初和2022年10月初收集了样本，代表了飓风伊恩之前和之后的情况。他们将在2023年1月再次采集样本。这组独特的样本将使科学家团队能够研究极端事件如何影响沿海水域的碳循环。该项目将支持来自传统上在海洋科学领域代表性不足的群体的科学家，包括两名早期职业科学家。更广泛的影响包括每个机构的学生培训和外展活动。由于气候变化，预计热带风暴和极端天气事件的强度和频率将增加。该项目将为这些事件在独特环境下对碳循环的影响提供新的见解。飓风伊恩于2022年9月28日在佛罗里达州迈尔斯堡以西登陆，成为4级风暴，并向西佛罗里达大陆架（WFS）输送了大量溶解的有机物质和营养物质。研究人员建议研究在这一极端事件中释放的异源溶解有机物的再矿化是否改变了WFS的水化学和生态过程。该项目汇集了一个跨学科的科学家团队，他们拥有多样化和互补的专业知识，包括有机物表征，无机碳测量，遥感和卫星成像分析，以及稳定和放射性同位素测量。该项目将为一名研究生和一名本科生提供培训机会，并将为每个机构的教育和推广活动作出贡献。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This project will study the fate of organic matter and nutrients delivered to the West Florida Shelf during Hurricane Ian in September 2022. The study will focus on three aspects of this hurricane event: (1) how do bacteria and light alter dissolved organic matter as it is transported offshore, (2) what is the effect of this large pulse of organic matter on inorganic carbon parameters and organic alkalinity, and (3) do nutrients derived from the recycling of this organic matter stimulate harmful algal blooms. Scientists involved in this project collected samples in late August/early September 2022 and in early October 2022, representing conditions just prior to and following Hurricane Ian. They will collect samples again in January 2023. This unique set of samples will enable the team of scientists to study how extreme events influence the carbon cycle in coastal waters. The project will support scientists from groups that are traditionally underrepresented in marine science, including two early career scientists. The broader impacts include student training and outreach activities at each institution.The magnitude and frequency of tropical storms and extreme weather events is expected to increase in response to climate change. This project will add new insights about the effects of these events on the carbon cycle in a unique setting. Hurricane Ian made landfall west of Fort Myers FL on September 28, 2022 as a Category 4 storm and delivered large amounts of dissolved organic matter and nutrients to the West Florida Shelf (WFS). The investigators propose to examine whether the remineralization of allochthonous dissolved organic matter released during this extreme event alters water chemistry and ecological processes on the WFS. The project brings together an interdisciplinary team of scientists with diverse and complementary expertise including organic matter characterization, inorganic carbon measurements, remote sensing and satellite imaging analysis, and stable and radiogenic isotope measurements. The project will provide training opportunities for one graduate student, one undergraduate, and will contribute to education and outreach activities at each of the institutions.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.